> Ok, probably question of habit. When I see former three lines like above I 
> immediately
> know what's going on. With new changes and I need to stop and start thinking 
> what it does...
> 
> Pavel

Just look at the return expression as the answer to the question in
function name:

>  bool Buffer::activeLabel(docstring const & label) const
>  {
> -     if (!insetLabel(label, true))
> -             return false;
> -
> -     return true;
> +     return insetLabel(label, true) != nullptr;
>  }

"Label is active when it have some (non-null) insetLabel"



>  bool doesFileExist(FileName & result, string const & search_dir, string
> const & name)
>  {
>      result = fileSearch(search_dir, name);
> -    if (!result.empty()) {
> -        return true;
> -    }
> -    return false;
> +    return !result.empty();
>  }

"File does exist when result of file search is not empty"


Yuriy
From 0ad498d4d3612e472b227fb0b4337218efb650ef Mon Sep 17 00:00:00 2001
From: Yuriy Skalko <yuriy.ska...@gmail.com>
Date: Mon, 5 Oct 2020 13:38:09 +0300
Subject: [PATCH] Refactoring

---
 src/Buffer.cpp                        |  6 +-----
 src/BufferParams.cpp                  |  8 ++++----
 src/DepTable.cpp                      |  2 +-
 src/ErrorList.cpp                     |  2 +-
 src/Font.cpp                          |  2 +-
 src/HunspellChecker.cpp               |  6 +++---
 src/Language.cpp                      | 16 ++++++++--------
 src/LyXVC.cpp                         |  4 +---
 src/Paragraph.cpp                     |  2 +-
 src/PersonalWordList.cpp              |  2 +-
 src/Session.cpp                       | 10 ++--------
 src/Text.cpp                          |  2 +-
 src/Text3.cpp                         |  2 +-
 src/TextMetrics.cpp                   |  2 +-
 src/Trans.cpp                         |  4 ++--
 src/VCBackend.cpp                     |  2 +-
 src/frontends/Painter.h               |  2 +-
 src/frontends/qt/CategorizedCombo.cpp |  2 +-
 src/frontends/qt/FancyLineEdit.cpp    |  2 +-
 src/frontends/qt/FindAndReplace.cpp   |  4 ++--
 src/frontends/qt/FloatPlacement.cpp   |  2 +-
 src/frontends/qt/GuiApplication.cpp   | 12 ++++++------
 src/frontends/qt/GuiErrorList.cpp     |  2 +-
 src/frontends/qt/GuiImage.cpp         |  2 +-
 src/frontends/qt/GuiRef.cpp           |  1 -
 src/frontends/qt/GuiSendto.cpp        |  8 ++++----
 src/frontends/qt/GuiSymbols.cpp       |  2 +-
 src/frontends/qt/GuiToolbar.cpp       |  4 ++--
 src/frontends/qt/GuiView.cpp          |  2 +-
 src/frontends/qt/GuiWorkArea.cpp      |  1 -
 src/frontends/qt/LayoutBox.cpp        |  6 +++---
 src/frontends/qt/PanelStack.cpp       |  2 +-
 src/frontends/qt/Toolbars.cpp         |  2 +-
 src/insets/InsetIPAMacro.cpp          |  2 +-
 src/insets/InsetNewline.cpp           |  2 +-
 src/insets/InsetNewpage.cpp           |  4 ++--
 src/insets/InsetNomencl.cpp           |  4 ++--
 src/insets/InsetQuotes.cpp            |  8 ++++----
 src/insets/InsetSeparator.cpp         |  4 ++--
 src/insets/InsetSpace.cpp             |  2 +-
 src/insets/InsetSpecialChar.cpp       |  2 +-
 src/insets/InsetTabular.cpp           |  4 +---
 src/insets/InsetVSpace.cpp            |  2 +-
 src/lyxfind.cpp                       |  8 ++++----
 src/mathed/InsetMathColor.cpp         |  4 ++--
 src/mathed/InsetMathFont.cpp          |  4 +---
 src/mathed/InsetMathFrac.cpp          |  4 ++--
 src/mathed/InsetMathHull.cpp          |  2 +-
 src/mathed/InsetMathMacro.cpp         | 12 ++++++------
 src/mathed/InsetMathNest.cpp          |  2 +-
 src/mathed/InsetMathScript.cpp        |  2 +-
 src/mathed/MathExtern.cpp             |  2 +-
 src/mathed/MathFactory.cpp            |  4 ++--
 src/mathed/MathParser.cpp             |  2 +-
 src/mathed/MathRow.cpp                |  2 +-
 src/output_latex.cpp                  | 18 +++++++++---------
 src/support/FileName.cpp              |  2 +-
 src/support/Package.cpp               |  7 ++-----
 src/support/docstring.cpp             |  2 +-
 src/tests/check_layout.cpp            |  2 +-
 src/tex2lyx/Parser.cpp                |  2 +-
 61 files changed, 111 insertions(+), 132 deletions(-)

diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index 40db4aa6d3..6d25d51908 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -664,7 +664,6 @@ void Buffer::cloneWithChildren(BufferMap & bufmap, 
CloneList_ptr clones) const
                buffer_clone->setChild(dit, child_clone);
        }
        buffer_clone->d->macro_lock = false;
-       return;
 }
 
 
@@ -4010,10 +4009,7 @@ InsetLabel const * Buffer::insetLabel(docstring const & 
label,
 
 bool Buffer::activeLabel(docstring const & label) const
 {
-       if (!insetLabel(label, true))
-               return false;
-
-       return true;
+       return insetLabel(label, true) != nullptr;
 }
 
 
diff --git a/src/BufferParams.cpp b/src/BufferParams.cpp
index b5ae2d4cad..58a02c8683 100644
--- a/src/BufferParams.cpp
+++ b/src/BufferParams.cpp
@@ -1373,9 +1373,9 @@ void BufferParams::writeFile(ostream & os, Buffer const * 
buf) const
        if (!lineno_opts.empty())
                os << "\\lineno_options " << lineno_opts << '\n';
 
-       if (isbackgroundcolor == true)
+       if (isbackgroundcolor)
                os << "\\backgroundcolor " << lyx::X11hexname(backgroundcolor) 
<< '\n';
-       if (isfontcolor == true)
+       if (isfontcolor)
                os << "\\fontcolor " << lyx::X11hexname(fontcolor) << '\n';
        if (notefontcolor != lyx::rgbFromHexName("#cccccc"))
                os << "\\notefontcolor " << lyx::X11hexname(notefontcolor) << 
'\n';
@@ -1979,7 +1979,7 @@ bool BufferParams::writeLaTeX(otexstream & os, 
LaTeXFeatures & features,
        }
 
        // only output when the background color is not default
-       if (isbackgroundcolor == true) {
+       if (isbackgroundcolor) {
                // only require color here, the background color will be defined
                // in LaTeXFeatures.cpp to avoid interferences with the LaTeX
                // package pdfpages
@@ -1988,7 +1988,7 @@ bool BufferParams::writeLaTeX(otexstream & os, 
LaTeXFeatures & features,
        }
 
        // only output when the font color is not default
-       if (isfontcolor == true) {
+       if (isfontcolor) {
                // only require color here, the font color will be defined
                // in LaTeXFeatures.cpp to avoid interferences with the LaTeX
                // package pdfpages
diff --git a/src/DepTable.cpp b/src/DepTable.cpp
index 47daf39113..853edf22c8 100644
--- a/src/DepTable.cpp
+++ b/src/DepTable.cpp
@@ -228,7 +228,7 @@ bool DepTable::read(FileName const & f)
 
                deplist[FileName(nome)] = di;
        }
-       return deplist.size();
+       return !deplist.empty();
 }
 
 
diff --git a/src/ErrorList.cpp b/src/ErrorList.cpp
index 1613ce7e61..7022c7bcf5 100644
--- a/src/ErrorList.cpp
+++ b/src/ErrorList.cpp
@@ -32,7 +32,7 @@ ErrorItem::ErrorItem(docstring const & error_, docstring 
const & description_,
 
 
 ErrorItem::ErrorItem()
-       : start(TexRow::text_none), end(TexRow::text_none), buffer(0)
+       : start(TexRow::text_none), end(TexRow::text_none), buffer(nullptr)
 {}
 
 
diff --git a/src/Font.cpp b/src/Font.cpp
index 327bc1821b..fda0854fe1 100644
--- a/src/Font.cpp
+++ b/src/Font.cpp
@@ -864,7 +864,7 @@ ostream & operator<<(ostream & os, FontInfo const & f)
 ostream & operator<<(ostream & os, Font const & font)
 {
        return os << font.bits_
-               << " lang: " << (font.lang_ ? font.lang_->lang() : nullptr);
+               << " lang: " << (font.lang_ ? font.lang_->lang() : "");
 }
 
 
diff --git a/src/HunspellChecker.cpp b/src/HunspellChecker.cpp
index dcdc1bbbd7..015973e1f4 100644
--- a/src/HunspellChecker.cpp
+++ b/src/HunspellChecker.cpp
@@ -234,11 +234,11 @@ Hunspell * HunspellChecker::Private::lookup(Language 
const * lang)
 }
 
 
-Hunspell * HunspellChecker::Private::addSpeller(Language const * lang,string & 
path)
+Hunspell * HunspellChecker::Private::addSpeller(Language const * lang, string 
& path)
 {
        if (!haveDictionary(lang, path)) {
-               spellers_[lang->lang()] = 0;
-               return 0;
+               spellers_[lang->lang()] = nullptr;
+               return nullptr;
        }
 
        FileName const affix(path + ".aff");
diff --git a/src/Language.cpp b/src/Language.cpp
index 4f625b55b9..84e03b1e9e 100644
--- a/src/Language.cpp
+++ b/src/Language.cpp
@@ -37,10 +37,10 @@ using namespace lyx::support;
 namespace lyx {
 
 Languages languages;
-Language const * ignore_language = 0;
-Language const * default_language = 0;
-Language const * latex_language = 0;
-Language const * reset_language = 0;
+Language const * ignore_language = nullptr;
+Language const * default_language = nullptr;
+Language const * latex_language = nullptr;
+Language const * reset_language = nullptr;
 
 
 bool Language::isPolyglossiaExclusive() const
@@ -344,12 +344,12 @@ void Languages::read(FileName const & filename)
                        break;
                if (l.lang() == "latex") {
                        // Check if latex language was not already defined.
-                       LASSERT(latex_language == 0, continue);
+                       LASSERT(latex_language == nullptr, continue);
                        static const Language latex_lang = l;
                        latex_language = &latex_lang;
                } else if (l.lang() == "ignore") {
                        // Check if ignore language was not already defined.
-                       LASSERT(ignore_language == 0, continue);
+                       LASSERT(ignore_language == nullptr, continue);
                        static const Language ignore_lang = l;
                        ignore_language = &ignore_lang;
                } else
@@ -436,7 +436,7 @@ Language const * Languages::getFromCode(string const & 
code) const
                if (match(code, l.second) == ApproximateMatch)
                        return &l.second;
        }
-       return 0;
+       return nullptr;
 }
 
 
@@ -460,7 +460,7 @@ Language const * Languages::getFromCode(string const & code,
        return getFromCode(code);
 
        LYXERR0("Unknown language `" << code << "'");
-       return 0;
+       return nullptr;
 }
 
 
diff --git a/src/LyXVC.cpp b/src/LyXVC.cpp
index 806d5e8143..7e36a1ce9c 100644
--- a/src/LyXVC.cpp
+++ b/src/LyXVC.cpp
@@ -348,9 +348,7 @@ string LyXVC::toggleReadOnly()
 
 bool LyXVC::inUse() const
 {
-       if (vcs)
-               return true;
-       return false;
+       return vcs != nullptr;
 }
 
 
diff --git a/src/Paragraph.cpp b/src/Paragraph.cpp
index 242f644ce6..bdda5d012b 100644
--- a/src/Paragraph.cpp
+++ b/src/Paragraph.cpp
@@ -4810,7 +4810,7 @@ void Paragraph::spellCheck() const
                        // start the spell checker on the unit of meaning
                        docstring word = asString(first, last, AS_STR_INSETS + 
AS_STR_SKIPDELETE);
                        WordLangTuple wl = WordLangTuple(word, lang);
-                       SpellChecker::Result result = word.size() ?
+                       SpellChecker::Result result = !word.empty() ?
                                speller->check(wl) : SpellChecker::WORD_OK;
                        d->markMisspelledWords(first, last, result, word, 
skips);
                        first = ++last;
diff --git a/src/PersonalWordList.cpp b/src/PersonalWordList.cpp
index 665eb331b5..4d3292e3f5 100644
--- a/src/PersonalWordList.cpp
+++ b/src/PersonalWordList.cpp
@@ -54,7 +54,7 @@ void PersonalWordList::load()
        LYXERR(Debug::FILES, "load personal dictionary from: " << fn);
        ifstream ifs(fn.toFilesystemEncoding().c_str());
 
-       dirty(words_.size() > 0);
+       dirty(!words_.empty());
        words_.clear();
        string line;
        getline(ifs, line);
diff --git a/src/Session.cpp b/src/Session.cpp
index 3bb9c03a33..8fc8fa23d8 100644
--- a/src/Session.cpp
+++ b/src/Session.cpp
@@ -494,10 +494,7 @@ void AuthFilesSection::write(ostream & os) const
 
 bool AuthFilesSection::find(string const & name) const
 {
-       if (auth_files_.find(name) != auth_files_.end())
-               return true;
-
-       return false;
+       return auth_files_.find(name) != auth_files_.end();
 }
 
 
@@ -547,10 +544,7 @@ bool ShellEscapeSection::find(string const & name) const
 
 bool ShellEscapeSection::findAuth(string const & name) const
 {
-       if (shellescape_files_.find(name + ",1") != shellescape_files_.end())
-               return true;
-
-       return false;
+       return shellescape_files_.find(name + ",1") != shellescape_files_.end();
 }
 
 
diff --git a/src/Text.cpp b/src/Text.cpp
index 0e058641d6..e4eb4abf10 100644
--- a/src/Text.cpp
+++ b/src/Text.cpp
@@ -1778,7 +1778,7 @@ bool Text::backspace(Cursor & cur)
                Cursor prev_cur = cur;
                --prev_cur.pit();
 
-               if (cur.paragraph().size() > 0
+               if (!cur.paragraph().empty()
                    && 
!prev_cur.paragraph().isMergedOnEndOfParDeletion(cur.buffer()->params().track_changes))
 {
                        cur.recordUndo(prev_cur.pit(), prev_cur.pit());
                        prev_cur.paragraph().setChange(prev_cur.lastpos(), 
Change(Change::DELETED));
diff --git a/src/Text3.cpp b/src/Text3.cpp
index 6631d49012..af904041c2 100644
--- a/src/Text3.cpp
+++ b/src/Text3.cpp
@@ -1276,7 +1276,7 @@ void Text::dispatch(Cursor & cur, FuncRequest & cmd)
                Paragraph const & nextpar = lastpar ? par : pars_[pit + 1];
                pit_type prev = pit > 0 ? depthHook(pit, par.getDepth()) : pit;
                if (prev < pit && cur.pos() == par.beginOfBody()
-                   && !par.size() && !par.isEnvSeparator(cur.pos())
+                   && par.empty() && !par.isEnvSeparator(cur.pos())
                    && !par.layout().keepempty
                    && !par.layout().isCommand()
                    && pars_[prev].layout() != par.layout()
diff --git a/src/TextMetrics.cpp b/src/TextMetrics.cpp
index 8e9a157a7a..07c2b27990 100644
--- a/src/TextMetrics.cpp
+++ b/src/TextMetrics.cpp
@@ -1486,7 +1486,7 @@ InsetList::Element * TextMetrics::checkInsetHit(pit_type 
pit, int x, int y)
        }
 
        LYXERR(Debug::DEBUG, "No inset hit. ");
-       return 0;
+       return nullptr;
 }
 
 
diff --git a/src/Trans.cpp b/src/Trans.cpp
index 679866da84..2f0f317355 100644
--- a/src/Trans.cpp
+++ b/src/Trans.cpp
@@ -510,7 +510,7 @@ docstring const TransDeadkeyState::deadkey(char_type c, 
KmodInfo d)
        KmodException::const_iterator cit = 
deadkey_info_.exception_list.begin();
        KmodException::const_iterator end = deadkey_info_.exception_list.end();
        for (; cit != end; ++cit) {
-               if (cit->combined == true && cit->accent == d.accent) {
+               if (cit->combined && cit->accent == d.accent) {
                        deadkey2_ = c;
                        deadkey2_info_ = d;
                        comb_info_ = (*cit);
@@ -656,7 +656,7 @@ void TransManager::deadkey(char_type c, tex_accent accent, 
Text * t, Cursor & cu
                // A deadkey was pressed that cannot be printed
                // or a accent command was typed in the minibuffer
                KmodInfo i;
-               if (active_->isAccentDefined(accent, i) == true) {
+               if (active_->isAccentDefined(accent, i)) {
                        docstring const res = trans_fsm_
                                .currentState->deadkey(c, i);
                        insert(res, t, cur);
diff --git a/src/VCBackend.cpp b/src/VCBackend.cpp
index 3ea4624399..309d705372 100644
--- a/src/VCBackend.cpp
+++ b/src/VCBackend.cpp
@@ -1156,7 +1156,7 @@ SVN::SVN(FileName const & m, Buffer * b) : VCS(b)
        // Here we know that the buffer file is either already in SVN or
        // about to be registered
        master_ = m;
-       locked_mode_ = 0;
+       locked_mode_ = false;
        scanMaster();
 }
 
diff --git a/src/frontends/Painter.h b/src/frontends/Painter.h
index 718718f979..e2796d97d9 100644
--- a/src/frontends/Painter.h
+++ b/src/frontends/Painter.h
@@ -154,7 +154,7 @@ public:
 
        double pixelRatio() const { return pixel_ratio_; }
 
-       double develMode() const { return devel_mode_; }
+       bool develMode() const { return devel_mode_; }
 
        /// draw the underbar, strikeout, xout, uuline and uwave font attributes
        virtual void textDecoration(FontInfo const & f, int x, int y, int 
width) = 0;
diff --git a/src/frontends/qt/CategorizedCombo.cpp 
b/src/frontends/qt/CategorizedCombo.cpp
index d86bd382f8..4aebcf6a91 100644
--- a/src/frontends/qt/CategorizedCombo.cpp
+++ b/src/frontends/qt/CategorizedCombo.cpp
@@ -71,7 +71,7 @@ private:
 class CCFilterModel : public QSortFilterProxyModel {
 public:
        ///
-       CCFilterModel(QObject * parent = 0)
+       CCFilterModel(QObject * parent = nullptr)
                : QSortFilterProxyModel(parent)
        {}
 };
diff --git a/src/frontends/qt/FancyLineEdit.cpp 
b/src/frontends/qt/FancyLineEdit.cpp
index c7035ac7c9..dae7444899 100644
--- a/src/frontends/qt/FancyLineEdit.cpp
+++ b/src/frontends/qt/FancyLineEdit.cpp
@@ -60,7 +60,7 @@ FancyLineEditPrivate::FancyLineEditPrivate(FancyLineEdit 
*parent) :
     m_lineEdit(parent)
 {
     for (int i = 0; i < 2; ++i) {
-        m_menu[i] = 0;
+        m_menu[i] = nullptr;
         m_menuTabFocusTrigger[i] = false;
         m_iconbutton[i] = new IconButton(parent);
         m_iconbutton[i]->installEventFilter(this);
diff --git a/src/frontends/qt/FindAndReplace.cpp 
b/src/frontends/qt/FindAndReplace.cpp
index 271ce9be90..af2bbbbea3 100644
--- a/src/frontends/qt/FindAndReplace.cpp
+++ b/src/frontends/qt/FindAndReplace.cpp
@@ -599,7 +599,7 @@ FindAndReplace::FindAndReplace(GuiView & parent,
 
 FindAndReplace::~FindAndReplace()
 {
-       setFocusProxy(0);
+       setFocusProxy(nullptr);
        delete widget_;
 }
 
@@ -620,7 +620,7 @@ void FindAndReplaceWidget::updateGUI()
                                old_buffer_ = &bv->buffer();
                }
        } else
-               old_buffer_ = 0;
+               old_buffer_ = nullptr;
 
        bool const replace_enabled = bv && !bv->buffer().isReadonly();
        replace_work_area_->setEnabled(replace_enabled);
diff --git a/src/frontends/qt/FloatPlacement.cpp 
b/src/frontends/qt/FloatPlacement.cpp
index dbbaa5961b..d11458716f 100644
--- a/src/frontends/qt/FloatPlacement.cpp
+++ b/src/frontends/qt/FloatPlacement.cpp
@@ -35,7 +35,7 @@ namespace frontend {
 
 FloatPlacement::FloatPlacement(bool show_options, QWidget * parent)
        : InsetParamsWidget(parent), standardfloat_(true),
-         allows_wide_(true), allows_sideways_(true), float_list_(0)
+         allows_wide_(true), allows_sideways_(true), float_list_(nullptr)
 {
        setupUi(this);
 
diff --git a/src/frontends/qt/GuiApplication.cpp 
b/src/frontends/qt/GuiApplication.cpp
index bf91789178..1763abdfc0 100644
--- a/src/frontends/qt/GuiApplication.cpp
+++ b/src/frontends/qt/GuiApplication.cpp
@@ -895,8 +895,8 @@ public:
 
 struct GuiApplication::Private
 {
-       Private(): language_model_(0), meta_fake_bit(NoModifier),
-               global_menubar_(0)
+       Private(): language_model_(nullptr), meta_fake_bit(NoModifier),
+               global_menubar_(nullptr)
        {
        #if (QT_VERSION < 0x050000) || (QT_VERSION >= 0x050400)
        #if defined(Q_OS_WIN) || defined(Q_CYGWIN_WIN)
@@ -993,7 +993,7 @@ GuiApplication::~GuiApplication()
 
 
 GuiApplication::GuiApplication(int & argc, char ** argv)
-       : QApplication(argc, argv), current_view_(0),
+       : QApplication(argc, argv), current_view_(nullptr),
          d(new GuiApplication::Private)
 {
        QString app_name = "LyX";
@@ -1123,8 +1123,8 @@ FuncStatus GuiApplication::getStatus(FuncRequest const & 
cmd) const
 {
        FuncStatus status;
 
-       BufferView * bv = 0;
-       BufferView * doc_bv = 0;
+       BufferView * bv = nullptr;
+       BufferView * doc_bv = nullptr;
 
        if (cmd.action() == LFUN_NOACTION) {
                status.message(from_utf8(N_("Nothing to do")));
@@ -1289,7 +1289,7 @@ bool GuiApplication::getStatus(FuncRequest const & cmd, 
FuncStatus & flag) const
                break;
 
        case LFUN_WINDOW_CLOSE:
-               enable = d->views_.size() > 0;
+               enable = !d->views_.empty();
                break;
 
        case LFUN_BUFFER_NEW:
diff --git a/src/frontends/qt/GuiErrorList.cpp 
b/src/frontends/qt/GuiErrorList.cpp
index 0b625ccd51..9fbdedafaf 100644
--- a/src/frontends/qt/GuiErrorList.cpp
+++ b/src/frontends/qt/GuiErrorList.cpp
@@ -58,7 +58,7 @@ namespace lyx {
 namespace frontend {
 
 GuiErrorList::GuiErrorList(GuiView & lv)
-       : GuiDialog(lv, "errorlist", qt_("Error List")), buf_(0), 
from_master_(false)
+       : GuiDialog(lv, "errorlist", qt_("Error List")), buf_(nullptr), 
from_master_(false)
 {
        setupUi(this);
 
diff --git a/src/frontends/qt/GuiImage.cpp b/src/frontends/qt/GuiImage.cpp
index c73fe7cede..0c3df0b65d 100644
--- a/src/frontends/qt/GuiImage.cpp
+++ b/src/frontends/qt/GuiImage.cpp
@@ -173,7 +173,7 @@ bool GuiImage::clip(Params const & params)
 
 bool GuiImage::rotate(Params const & params)
 {
-       if (!params.angle)
+       if (params.angle == 0)
                return false;
 
        QImage const & image = is_transformed_ ? transformed_ : original_;
diff --git a/src/frontends/qt/GuiRef.cpp b/src/frontends/qt/GuiRef.cpp
index a727700005..8583d0cd26 100644
--- a/src/frontends/qt/GuiRef.cpp
+++ b/src/frontends/qt/GuiRef.cpp
@@ -187,7 +187,6 @@ void GuiRef::selectionChanged()
                return;
        QTreeWidgetItem * sel = selections.first();
        refHighlighted(sel);
-       return;
 }
 
 
diff --git a/src/frontends/qt/GuiSendto.cpp b/src/frontends/qt/GuiSendto.cpp
index a42bbb472c..b14db45304 100644
--- a/src/frontends/qt/GuiSendto.cpp
+++ b/src/frontends/qt/GuiSendto.cpp
@@ -38,7 +38,7 @@ namespace frontend {
 
 
 GuiSendTo::GuiSendTo(GuiView & lv)
-       : GuiDialog(lv, "sendto", qt_("Export or Send Document")), format_(0)
+       : GuiDialog(lv, "sendto", qt_("Export or Send Document")), 
format_(nullptr)
 {
        setupUi(this);
 
@@ -77,7 +77,7 @@ void GuiSendTo::updateContents()
        Format const * current_format = nullptr;
        int const line = formatLW->currentRow();
        if (line >= 0 && static_cast<unsigned int>(line) < all_formats.size()
-           && formatLW->selectedItems().size() > 0)
+           && !formatLW->selectedItems().empty())
                current_format = all_formats[line];
        // Reset the list widget
        formatLW->clear();
@@ -115,14 +115,14 @@ bool GuiSendTo::isValid()
        if (line < 0 || (line > int(formatLW->count())))
                return false;
 
-       return (formatLW->selectedItems().size() > 0
+       return (!formatLW->selectedItems().empty()
                && formatLW->count() != 0);
 }
 
 
 bool GuiSendTo::initialiseParams(string const &)
 {
-       format_ = 0;
+       format_ = nullptr;
        paramsToDialog(format_, command_);
        return true;
 }
diff --git a/src/frontends/qt/GuiSymbols.cpp b/src/frontends/qt/GuiSymbols.cpp
index a4fd4af650..4a6b0d6178 100644
--- a/src/frontends/qt/GuiSymbols.cpp
+++ b/src/frontends/qt/GuiSymbols.cpp
@@ -207,7 +207,7 @@ class GuiSymbols::Model : public QAbstractListModel
 {
 public:
        Model(GuiSymbols * parent)
-               : QAbstractListModel(parent), encoding_(0)
+               : QAbstractListModel(parent), encoding_(nullptr)
        {}
 
        QModelIndex index(int row, int column, QModelIndex const &) const 
override
diff --git a/src/frontends/qt/GuiToolbar.cpp b/src/frontends/qt/GuiToolbar.cpp
index 65f81c9b21..5c8c603daf 100644
--- a/src/frontends/qt/GuiToolbar.cpp
+++ b/src/frontends/qt/GuiToolbar.cpp
@@ -64,7 +64,7 @@ namespace frontend {
 
 GuiToolbar::GuiToolbar(ToolbarInfo const & tbinfo, GuiView & owner)
        : QToolBar(toqstr(tbinfo.gui_name), &owner), visibility_(0),
-         owner_(owner), command_buffer_(0), tbinfo_(tbinfo), filled_(false),
+         owner_(owner), command_buffer_(nullptr), tbinfo_(tbinfo), 
filled_(false),
          restored_(false)
 {
        setIconSize(owner.iconSize());
@@ -297,7 +297,7 @@ class DynamicMenuButton::Private
        Private(Private const &);
        void operator=(Private const &);
 public:
-       Private() : inset_(0) {}
+       Private() : inset_(nullptr) {}
        ///
        DocumentClassConstPtr text_class_;
        ///
diff --git a/src/frontends/qt/GuiView.cpp b/src/frontends/qt/GuiView.cpp
index cb351d1177..00f3b96ea4 100644
--- a/src/frontends/qt/GuiView.cpp
+++ b/src/frontends/qt/GuiView.cpp
@@ -1187,7 +1187,7 @@ void GuiView::dropEvent(QDropEvent * event)
                                found_formats.push_back(*it);
 
                FuncRequest cmd;
-               if (found_formats.size() >= 1) {
+               if (!found_formats.empty()) {
                        if (found_formats.size() > 1) {
                                //FIXME: show a dialog to choose the correct 
importable format
                                LYXERR(Debug::FILES,
diff --git a/src/frontends/qt/GuiWorkArea.cpp b/src/frontends/qt/GuiWorkArea.cpp
index 7c21088643..0104c8dd83 100644
--- a/src/frontends/qt/GuiWorkArea.cpp
+++ b/src/frontends/qt/GuiWorkArea.cpp
@@ -1061,7 +1061,6 @@ void GuiWorkArea::generateSyntheticMouseEvent()
        cur.boundary(bound);
 
        d->buffer_view_->buffer().changed(false);
-       return;
 }
 
 
diff --git a/src/frontends/qt/LayoutBox.cpp b/src/frontends/qt/LayoutBox.cpp
index 95814c942f..719a2d324d 100644
--- a/src/frontends/qt/LayoutBox.cpp
+++ b/src/frontends/qt/LayoutBox.cpp
@@ -85,7 +85,7 @@ private:
 class GuiLayoutFilterModel : public QSortFilterProxyModel {
 public:
        ///
-       GuiLayoutFilterModel(QObject * parent = 0)
+       GuiLayoutFilterModel(QObject * parent = nullptr)
                : QSortFilterProxyModel(parent)
        {}
 
@@ -111,7 +111,7 @@ class LayoutBox::Private
        void operator=(Private const &);
 public:
        Private(LayoutBox * parent, GuiView & gv) : p(parent), owner_(gv),
-               inset_(0),
+               inset_(nullptr),
                // set the layout model with two columns
                // 1st: translated layout names
                // 2nd: raw layout names
@@ -567,7 +567,7 @@ void LayoutBox::updateContents(bool reset)
                setEnabled(false);
                setMinimumWidth(sizeHint().width());
                d->text_class_.reset();
-               d->inset_ = 0;
+               d->inset_ = nullptr;
                return;
        }
        // we'll only update the layout list if the text class has changed
diff --git a/src/frontends/qt/PanelStack.cpp b/src/frontends/qt/PanelStack.cpp
index 4b6b875c8b..ef9c599a34 100644
--- a/src/frontends/qt/PanelStack.cpp
+++ b/src/frontends/qt/PanelStack.cpp
@@ -97,7 +97,7 @@ PanelStack::PanelStack(QWidget * parent)
 
 void PanelStack::addCategory(QString const & name, QString const & parent)
 {
-       QTreeWidgetItem * item = 0;
+       QTreeWidgetItem * item = nullptr;
 
        LYXERR(Debug::GUI, "addCategory n= " << name << "   parent= ");
 
diff --git a/src/frontends/qt/Toolbars.cpp b/src/frontends/qt/Toolbars.cpp
index d7a28b8025..7d29344732 100644
--- a/src/frontends/qt/Toolbars.cpp
+++ b/src/frontends/qt/Toolbars.cpp
@@ -418,7 +418,7 @@ ToolbarInfo const * Toolbars::info(std::string const & 
name) const
        for (Infos::const_iterator it = toolbar_info_.begin(); it != end; ++it)
                if (it->name == name)
                        return &(*it);
-       return 0;
+       return nullptr;
 }
 
 
diff --git a/src/insets/InsetIPAMacro.cpp b/src/insets/InsetIPAMacro.cpp
index 4e8afcfa7e..82f6c48e84 100644
--- a/src/insets/InsetIPAMacro.cpp
+++ b/src/insets/InsetIPAMacro.cpp
@@ -393,7 +393,7 @@ bool InsetIPADeco::insetAllowed(InsetCode code) const
 
 
 InsetIPAChar::InsetIPAChar(Kind k)
-       : Inset(0), kind_(k)
+       : Inset(nullptr), kind_(k)
 {}
 
 
diff --git a/src/insets/InsetNewline.cpp b/src/insets/InsetNewline.cpp
index 4c6f17e1d1..0e07af13f7 100644
--- a/src/insets/InsetNewline.cpp
+++ b/src/insets/InsetNewline.cpp
@@ -36,7 +36,7 @@ using namespace std;
 
 namespace lyx {
 
-InsetNewline::InsetNewline() : Inset(0)
+InsetNewline::InsetNewline() : Inset(nullptr)
 {}
 
 
diff --git a/src/insets/InsetNewpage.cpp b/src/insets/InsetNewpage.cpp
index 6e9f34211f..6f89eac03b 100644
--- a/src/insets/InsetNewpage.cpp
+++ b/src/insets/InsetNewpage.cpp
@@ -37,12 +37,12 @@ using namespace std;
 
 namespace lyx {
 
-       InsetNewpage::InsetNewpage() : Inset(0)
+       InsetNewpage::InsetNewpage() : Inset(nullptr)
 {}
 
 
 InsetNewpage::InsetNewpage(InsetNewpageParams const & params)
-       : Inset(0), params_(params)
+       : Inset(nullptr), params_(params)
 {}
 
 
diff --git a/src/insets/InsetNomencl.cpp b/src/insets/InsetNomencl.cpp
index c762e33d67..5e3c637a60 100644
--- a/src/insets/InsetNomencl.cpp
+++ b/src/insets/InsetNomencl.cpp
@@ -171,7 +171,7 @@ docstring InsetPrintNomencl::screenLabel() const
 
 
 struct NomenclEntry {
-       NomenclEntry() : par(0) {}
+       NomenclEntry() : par(nullptr) {}
        NomenclEntry(docstring s, docstring d, Paragraph const * p)
          : symbol(s), desc(d), par(p)
        {}
@@ -381,7 +381,7 @@ docstring nomenclWidest(Buffer const & buffer, OutputParams 
const & runparams)
 
        int w = 0;
        docstring symb;
-       InsetNomencl const * nomencl = 0;
+       InsetNomencl const * nomencl = nullptr;
        ParagraphList::const_iterator it = buffer.paragraphs().begin();
        ParagraphList::const_iterator end = buffer.paragraphs().end();
 
diff --git a/src/insets/InsetQuotes.cpp b/src/insets/InsetQuotes.cpp
index b90f1c27dd..c93de5a063 100644
--- a/src/insets/InsetQuotes.cpp
+++ b/src/insets/InsetQuotes.cpp
@@ -1057,10 +1057,10 @@ void InsetQuotes::validate(LaTeXFeatures & features) 
const
        switch (type) {
        case 0x0027: {
                if (features.runparams().isFullUnicode() && fontspec_)
-                               features.require("textquotesinglep");
-                       else
-                               features.require("textcomp");
-                       break;
+                       features.require("textquotesinglep");
+               else
+                       features.require("textcomp");
+               break;
        }
        case 0x0022: {
                if (features.runparams().isFullUnicode() && fontspec_)
diff --git a/src/insets/InsetSeparator.cpp b/src/insets/InsetSeparator.cpp
index efe6a483b0..16f7cdcbdf 100644
--- a/src/insets/InsetSeparator.cpp
+++ b/src/insets/InsetSeparator.cpp
@@ -36,12 +36,12 @@ using namespace lyx::frontend;
 
 namespace lyx {
 
-InsetSeparator::InsetSeparator() : Inset(0)
+InsetSeparator::InsetSeparator() : Inset(nullptr)
 {}
 
 
 InsetSeparator::InsetSeparator(InsetSeparatorParams const & params)
-       : Inset(0), params_(params)
+       : Inset(nullptr), params_(params)
 {}
 
 
diff --git a/src/insets/InsetSpace.cpp b/src/insets/InsetSpace.cpp
index 7656a14e10..d4cb7361b4 100644
--- a/src/insets/InsetSpace.cpp
+++ b/src/insets/InsetSpace.cpp
@@ -45,7 +45,7 @@ namespace lyx {
 
 
 InsetSpace::InsetSpace(InsetSpaceParams const & params)
-       : Inset(0), params_(params)
+       : Inset(nullptr), params_(params)
 {}
 
 
diff --git a/src/insets/InsetSpecialChar.cpp b/src/insets/InsetSpecialChar.cpp
index 56925c4f32..3ecdaf12e9 100644
--- a/src/insets/InsetSpecialChar.cpp
+++ b/src/insets/InsetSpecialChar.cpp
@@ -38,7 +38,7 @@ namespace lyx {
 
 
 InsetSpecialChar::InsetSpecialChar(Kind k)
-       : Inset(0), kind_(k)
+       : Inset(nullptr), kind_(k)
 {}
 
 
diff --git a/src/insets/InsetTabular.cpp b/src/insets/InsetTabular.cpp
index 8458ce4728..d24d174cbc 100644
--- a/src/insets/InsetTabular.cpp
+++ b/src/insets/InsetTabular.cpp
@@ -2189,9 +2189,7 @@ bool Tabular::needRotating() const
 
 bool Tabular::isLastCell(idx_type cell) const
 {
-       if (cell + 1 < numberofcells)
-               return false;
-       return true;
+       return cell + 1 >= numberofcells;
 }
 
 
diff --git a/src/insets/InsetVSpace.cpp b/src/insets/InsetVSpace.cpp
index a6092cb8a3..03a272e650 100644
--- a/src/insets/InsetVSpace.cpp
+++ b/src/insets/InsetVSpace.cpp
@@ -50,7 +50,7 @@ int const ADD_TO_VSPACE_WIDTH = 5;
 
 
 InsetVSpace::InsetVSpace(VSpace const & space)
-       : Inset(0), space_(space)
+       : Inset(nullptr), space_(space)
 {}
 
 
diff --git a/src/lyxfind.cpp b/src/lyxfind.cpp
index 5f9e2d3093..f36e02bf77 100644
--- a/src/lyxfind.cpp
+++ b/src/lyxfind.cpp
@@ -360,7 +360,7 @@ pair<bool, int> replaceOne(BufferView * bv, docstring 
searchstr,
        if (!cur.selection()) {
                // no selection, non-empty search string: find it
                if (!searchstr.empty()) {
-                       bool found = findOne(bv, searchstr, case_sens, whole, 
forward, true, findnext);
+                       bool const found = findOne(bv, searchstr, case_sens, 
whole, forward, true, findnext);
                        return make_pair(found, 0);
                }
                // empty search string
@@ -389,7 +389,7 @@ pair<bool, int> replaceOne(BufferView * bv, docstring 
searchstr,
        // no selection or current selection is not search word:
        // just find the search word
        if (!have_selection || !match) {
-               bool found = findOne(bv, searchstr, case_sens, whole, forward, 
true, findnext);
+               bool const found = findOne(bv, searchstr, case_sens, whole, 
forward, true, findnext);
                return make_pair(found, 0);
        }
 
@@ -3592,7 +3592,7 @@ static bool firstUppercase(Cursor const & cur)
 static void changeFirstCase(Buffer & buffer, TextCase first_case, TextCase 
others_case)
 {
        ParagraphList::iterator pit = buffer.paragraphs().begin();
-       LASSERT(pit->size() >= 1, /**/);
+       LASSERT(!pit->empty(), /**/);
        pos_type right = pos_type(1);
        pit->changeCase(buffer.params(), pos_type(0), right, first_case);
        right = pit->size();
@@ -3605,7 +3605,7 @@ static void changeFirstCase(Buffer & buffer, TextCase 
first_case, TextCase other
 static int findAdvReplace(BufferView * bv, FindAndReplaceOptions const & opt, 
MatchStringAdv & matchAdv)
 {
        Cursor & cur = bv->cursor();
-       if (opt.repl_buf_name == docstring()
+       if (opt.repl_buf_name.empty()
            || theBufferList().getBuffer(FileName(to_utf8(opt.repl_buf_name)), 
true) == 0
            || theBufferList().getBuffer(FileName(to_utf8(opt.find_buf_name)), 
true) == 0)
                return 0;
diff --git a/src/mathed/InsetMathColor.cpp b/src/mathed/InsetMathColor.cpp
index 94a6c42e64..31ba778faf 100644
--- a/src/mathed/InsetMathColor.cpp
+++ b/src/mathed/InsetMathColor.cpp
@@ -99,10 +99,10 @@ void InsetMathColor::write(WriteStream & os) const
        // We have to ensure correct spacing when the front and/or back
        // atoms are not ordinary ones (bug 11827).
        docstring const frontclass =
-               cell(0).size() ? class_to_string(cell(0).front()->mathClass())
+               !cell(0).empty() ? class_to_string(cell(0).front()->mathClass())
                               : from_ascii("mathord");
        docstring const backclass =
-               cell(0).size() ? class_to_string(cell(0).back()->mathClass())
+               !cell(0).empty() ? class_to_string(cell(0).back()->mathClass())
                               : from_ascii("mathord");
        bool adjchk = os.latex() && !os.inMathClass() && (normalcolor(color_) 
|| oldstyle_);
        bool adjust_front = frontclass != "mathord" && adjchk;
diff --git a/src/mathed/InsetMathFont.cpp b/src/mathed/InsetMathFont.cpp
index f199ee5bcf..1de00464a7 100644
--- a/src/mathed/InsetMathFont.cpp
+++ b/src/mathed/InsetMathFont.cpp
@@ -58,9 +58,7 @@ InsetMath::mode_type InsetMathFont::currentMode() const
 
 bool InsetMathFont::lockedMode() const
 {
-       if (key_->extra == "forcetext")
-               return true;
-       return false;
+       return key_->extra == "forcetext";
 }
 
 
diff --git a/src/mathed/InsetMathFrac.cpp b/src/mathed/InsetMathFrac.cpp
index 90d507cfbe..03125e99ca 100644
--- a/src/mathed/InsetMathFrac.cpp
+++ b/src/mathed/InsetMathFrac.cpp
@@ -80,13 +80,13 @@ Inset * InsetMathFrac::clone() const
 
 InsetMathFrac * InsetMathFrac::asFracInset()
 {
-       return kind_ == ATOP ? 0 : this;
+       return kind_ == ATOP ? nullptr : this;
 }
 
 
 InsetMathFrac const * InsetMathFrac::asFracInset() const
 {
-       return kind_ == ATOP ? 0 : this;
+       return kind_ == ATOP ? nullptr : this;
 }
 
 
diff --git a/src/mathed/InsetMathHull.cpp b/src/mathed/InsetMathHull.cpp
index e7326b64e5..156cbec2fd 100644
--- a/src/mathed/InsetMathHull.cpp
+++ b/src/mathed/InsetMathHull.cpp
@@ -1579,7 +1579,7 @@ void InsetMathHull::mutate(HullType newtype)
                        numbered(0, false);
                } else {
                        setType(hullEquation);
-                       numbered(0, label_[0] ? true : false);
+                       numbered(0, label_[0] != nullptr);
                        mutate(newtype);
                }
                break;
diff --git a/src/mathed/InsetMathMacro.cpp b/src/mathed/InsetMathMacro.cpp
index 15b5d29d9c..862ee8a4d7 100644
--- a/src/mathed/InsetMathMacro.cpp
+++ b/src/mathed/InsetMathMacro.cpp
@@ -205,7 +205,7 @@ public:
                : name_(name), displayMode_(DISPLAY_INIT),
                  expanded_(buf), definition_(buf), attachedArgsNum_(0),
                  optionals_(0), nextFoldMode_(true), macroBackup_(buf),
-                 macro_(0), needsUpdate_(false), isUpdating_(false),
+                 macro_(nullptr), needsUpdate_(false), isUpdating_(false),
                  appetite_(9), nesting_(0), limits_(AUTO_LIMITS)
        {
        }
@@ -649,7 +649,7 @@ void InsetMathMacro::updateMacro(MacroContext const & mc)
                        d->needsUpdate_ = true;
                }
        } else {
-               d->macro_ = 0;
+               d->macro_ = nullptr;
        }
 }
 
@@ -684,7 +684,7 @@ void InsetMathMacro::updateRepresentation(Cursor * cur, 
MacroContext const & mc,
        UpdateLocker locker(*this);
 
        // known macro?
-       if (d->macro_ == 0)
+       if (d->macro_ == nullptr)
                return;
 
        // remember nesting level of this macro
@@ -837,7 +837,7 @@ void 
InsetMathMacro::setDisplayMode(InsetMathMacro::DisplayMode mode, int appeti
 
 InsetMathMacro::DisplayMode InsetMathMacro::computeDisplayMode() const
 {
-       if (d->nextFoldMode_ == true && d->macro_ && !d->macro_->locked())
+       if (d->nextFoldMode_ && d->macro_ && !d->macro_->locked())
                return DISPLAY_NORMAL;
        else
                return DISPLAY_UNFOLDED;
@@ -1172,10 +1172,10 @@ void InsetMathMacro::write(WriteStream & os) const
                // contains macros with optionals.
                bool braced = false;
                size_type last = cell(i).size() - 1;
-               if (cell(i).size() && cell(i)[last]->asUnknownInset()) {
+               if (!cell(i).empty() && cell(i)[last]->asUnknownInset()) {
                        latexkeys const * l = 
in_word_set(cell(i)[last]->name());
                        braced = (l && l->inset == "big");
-               } else if (cell(i).size() && cell(i)[0]->asScriptInset()) {
+               } else if (!cell(i).empty() && cell(i)[0]->asScriptInset()) {
                        braced = cell(i)[0]->asScriptInset()->nuc().empty();
                } else {
                        for (size_type j = 0; j < cell(i).size(); ++j) {
diff --git a/src/mathed/InsetMathNest.cpp b/src/mathed/InsetMathNest.cpp
index be6fecc526..9d88b1337b 100644
--- a/src/mathed/InsetMathNest.cpp
+++ b/src/mathed/InsetMathNest.cpp
@@ -2027,7 +2027,7 @@ CompletionList const *
 InsetMathNest::createCompletionList(Cursor const & cur) const
 {
        if (!cur.inMacroMode())
-               return 0;
+               return nullptr;
 
        return new MathCompletionList(cur);
 }
diff --git a/src/mathed/InsetMathScript.cpp b/src/mathed/InsetMathScript.cpp
index cbef2fafb1..e40db4f164 100644
--- a/src/mathed/InsetMathScript.cpp
+++ b/src/mathed/InsetMathScript.cpp
@@ -388,7 +388,7 @@ void InsetMathScript::removeScript(bool up)
                if (up == cell_1_is_up_)
                        cells_.pop_back();
        } else if (nargs() == 3) {
-               if (up == true) {
+               if (up) {
                        swap(cells_[1], cells_[2]);
                        cell_1_is_up_ = false;
                } else {
diff --git a/src/mathed/MathExtern.cpp b/src/mathed/MathExtern.cpp
index 18340e11c8..092de56ee5 100644
--- a/src/mathed/MathExtern.cpp
+++ b/src/mathed/MathExtern.cpp
@@ -75,7 +75,7 @@ static char const * function_names[] = {
        "det", "dim", "exp", "gcd", "hom", "inf", "ker",
        "lg", "lim", "liminf", "limsup", "ln", "log",
        "max", "min", "sec", "sin", "sinh", "sup",
-       "tan", "tanh", "Pr", 0
+       "tan", "tanh", "Pr", nullptr
 };
 
 static size_t const npos = lyx::docstring::npos;
diff --git a/src/mathed/MathFactory.cpp b/src/mathed/MathFactory.cpp
index afee57ef1c..54fe012857 100644
--- a/src/mathed/MathFactory.cpp
+++ b/src/mathed/MathFactory.cpp
@@ -444,9 +444,9 @@ latexkeys const * in_word_set(docstring const & str)
 {
        MathWordList::iterator it = theMathWordList.find(str);
        if (it == theMathWordList.end())
-               return 0;
+               return nullptr;
        if (it->second.inset == "macro")
-               return 0;
+               return nullptr;
        return &(it->second);
 }
 
diff --git a/src/mathed/MathParser.cpp b/src/mathed/MathParser.cpp
index c3bea0d540..32d7ef6424 100644
--- a/src/mathed/MathParser.cpp
+++ b/src/mathed/MathParser.cpp
@@ -1497,7 +1497,7 @@ bool Parser::parse1(InsetMathGrid & grid, unsigned flags,
                                if (ar[i].size() == 1)
                                        script[i] = 
ar[i][0].nucleus()->asScriptInset();
                        }
-                       bool const hasscript[2] = {script[0] ? true : false, 
script[1] ? true : false};
+                       bool const hasscript[2] = {script[0] != nullptr, 
script[1] != nullptr};
                        cell->push_back(MathAtom(new InsetMathSideset(buf, 
hasscript[0], hasscript[1])));
                        if (hasscript[0]) {
                                if (script[0]->hasDown())
diff --git a/src/mathed/MathRow.cpp b/src/mathed/MathRow.cpp
index d78815acf3..be61c8a39c 100644
--- a/src/mathed/MathRow.cpp
+++ b/src/mathed/MathRow.cpp
@@ -39,7 +39,7 @@ namespace lyx {
 
 MathRow::Element::Element(MetricsInfo const & mi, Type t, MathClass mc)
        : type(t), mclass(mc), before(0), after(0), 
macro_nesting(mi.base.macro_nesting),
-         marker(InsetMath::NO_MARKER), inset(0), compl_unique_to(0), ar(0),
+         marker(InsetMath::NO_MARKER), inset(nullptr), compl_unique_to(0), 
ar(nullptr),
          color(Color_red)
 {}
 
diff --git a/src/output_latex.cpp b/src/output_latex.cpp
index fefa62fa10..b2d51488cd 100644
--- a/src/output_latex.cpp
+++ b/src/output_latex.cpp
@@ -109,7 +109,7 @@ bool atSameLastLangSwitchDepth(OutputState const * state)
        // commands. Instead, return always true when using babel with
        // only a begin command.
 
-       return state->lang_switch_depth_.size() == 0
+       return state->lang_switch_depth_.empty()
                        ? true
                        : abs(state->lang_switch_depth_.top()) == 
state->nest_level_;
 }
@@ -119,7 +119,7 @@ bool isLocalSwitch(OutputState const * state)
 {
        // Return true if the language was opened by a local command switch.
 
-       return state->lang_switch_depth_.size()
+       return !state->lang_switch_depth_.empty()
                && state->lang_switch_depth_.top() < 0;
 }
 
@@ -128,7 +128,7 @@ bool langOpenedAtThisLevel(OutputState const * state)
 {
        // Return true if the language was opened at the current nesting level.
 
-       return state->lang_switch_depth_.size()
+       return !state->lang_switch_depth_.empty()
                && abs(state->lang_switch_depth_.top()) == state->nest_level_;
 }
 
@@ -241,7 +241,7 @@ static TeXEnvironmentData prepareEnvironment(Buffer const & 
buf,
                // polyglossia or begin/end commands, then the current
                // language is the document language.
                string const & cur_lang = using_begin_end
-                                         && state->lang_switch_depth_.size()
+                                         && !state->lang_switch_depth_.empty()
                                                  ? openLanguageName(state)
                                                  : doc_lang;
 
@@ -442,7 +442,7 @@ void TeXEnvironment(Buffer const & buf, Text const & text,
                        if ((par->layout() != nextpar->layout()
                             || par->params().depth() == 
nextpar->params().depth()
                             || par->params().leftIndent() == 
nextpar->params().leftIndent())
-                           && !runparams.for_search && cpar.size() > 0
+                           && !runparams.for_search && !cpar.empty()
                            && cpar.isDeleted(0, cpar.size()) && 
!buf.params().output_changes) {
                                if (!buf.params().output_changes && 
!cpar.parEndChange().deleted())
                                        os << '\n' << '\n';
@@ -761,7 +761,7 @@ void TeXOnePar(Buffer const & buf,
        // Do not output empty commands if the whole paragraph has
        // been deleted with ct and changes are not output.
        if (!runparams_in.for_search && style.latextype != LATEX_ENVIRONMENT
-           && par.size() > 0 && par.isDeleted(0, par.size()) && 
!bparams.output_changes)
+           && !par.empty() && par.isDeleted(0, par.size()) && 
!bparams.output_changes)
                return;
 
        LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " ptr " << 
&par << " '"
@@ -1312,7 +1312,7 @@ void TeXOnePar(Buffer const & buf,
                                                && nextpar
                                                && style != nextpar->layout())))
                                    || (atSameLastLangSwitchDepth(state)
-                                       && state->lang_switch_depth_.size()
+                                       && !state->lang_switch_depth_.empty()
                                        && cur_lang != par_lang)
                                    || in_polyglossia_rtl_env)
                                {
@@ -1355,7 +1355,7 @@ void TeXOnePar(Buffer const & buf,
        }
 
        bool const last_was_separator =
-               par.size() > 0 && par.isEnvSeparator(par.size() - 1);
+               !par.empty() && par.isEnvSeparator(par.size() - 1);
 
        // Signify added/deleted par break in output if show changes in output
        if (nextpar && !os.afterParbreak() && !last_was_separator
@@ -1666,7 +1666,7 @@ void latexParagraphs(Buffer const & buf,
                        if ((par->layout() != nextpar->layout()
                             || par->params().depth() == 
nextpar->params().depth()
                             || par->params().leftIndent() == 
nextpar->params().leftIndent())
-                           && !runparams.for_search && cpar.size() > 0
+                           && !runparams.for_search && !cpar.empty()
                            && cpar.isDeleted(0, cpar.size()) && 
!bparams.output_changes) {
                                if (!cpar.parEndChange().deleted())
                                        os << '\n' << '\n';
diff --git a/src/support/FileName.cpp b/src/support/FileName.cpp
index a6b849407a..9714965bdf 100644
--- a/src/support/FileName.cpp
+++ b/src/support/FileName.cpp
@@ -89,7 +89,7 @@ struct FileName::Private
                : fi(toqstr(handleTildeName(abs_filename)))
        {
                name = fromqstr(fi.absoluteFilePath());
-               fi.setCaching(fi.exists() ? true : false);
+               fi.setCaching(fi.exists());
        }
        ///
        inline void refresh()
diff --git a/src/support/Package.cpp b/src/support/Package.cpp
index f931ddf705..a349a5e755 100644
--- a/src/support/Package.cpp
+++ b/src/support/Package.cpp
@@ -366,10 +366,7 @@ bool inBuildDir(FileName const & abs_binary,
 bool doesFileExist(FileName & result, string const & search_dir, string const 
& name)
 {
     result = fileSearch(search_dir, name);
-    if (!result.empty()) {
-        return true;
-    }
-    return false;
+    return !result.empty();
 }
 
 
@@ -382,7 +379,7 @@ bool lyxBinaryPath(FileName & lyx_binary, string const & 
search_dir, string cons
     } else if (doesFileExist(lyx_binary, search_dir, "lyx" + 
string(PROGRAM_SUFFIX) + ext)) {
     } else if (doesFileExist(lyx_binary, search_dir, "LyX" + 
string(PROGRAM_SUFFIX) + ext)){
     }
-    return !lyx_binary.empty() ? true : false;
+    return !lyx_binary.empty();
 }
 
 
diff --git a/src/support/docstring.cpp b/src/support/docstring.cpp
index e73c3f09c0..cbee18a20a 100644
--- a/src/support/docstring.cpp
+++ b/src/support/docstring.cpp
@@ -625,7 +625,7 @@ protected:
                        }
                        if (ok) {
                                err = ios_base::goodbit;
-                               v = truename == s ? true : false;
+                               v = (truename == s);
                        } else
                                err = ios_base::failbit;
                        if (iit == eit)
diff --git a/src/tests/check_layout.cpp b/src/tests/check_layout.cpp
index 7100c712d8..2fa0fe11e9 100644
--- a/src/tests/check_layout.cpp
+++ b/src/tests/check_layout.cpp
@@ -57,7 +57,7 @@ bool test_Layout(string const & input, string const & output)
                return false;
        }
        LayoutFile const & f = l[i];
-       ostream * os = NULL;
+       ostream * os = nullptr;
        if (output == "-")
                os = &cout;
        else if (!output.empty())
diff --git a/src/tex2lyx/Parser.cpp b/src/tex2lyx/Parser.cpp
index cc8dd5aa58..e44aa3e69a 100644
--- a/src/tex2lyx/Parser.cpp
+++ b/src/tex2lyx/Parser.cpp
@@ -154,7 +154,7 @@ iparserdocstream & iparserdocstream::get(char_type &c)
 
 
 Parser::Parser(idocstream & is, std::string const & fixedenc)
-       : lineno_(0), pos_(0), iss_(0), is_(is),
+       : lineno_(0), pos_(0), iss_(nullptr), is_(is),
          encoding_iconv_(fixedenc.empty() ? "UTF-8" : fixedenc),
          theCatcodesType_(NORMAL_CATCODES), curr_cat_(UNDECIDED_CATCODES),
          fixed_enc_(!fixedenc.empty())
-- 
2.28.0.windows.1

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