Re: How to debug (potential) GC bugs?
On Saturday, 1 October 2016 at 00:06:05 UTC, Matthias Klumpp wrote: I do none of those things in my code though... `grep "~this" *.d` gives nothing? It can be a struct with destructor stored in a class. Can you observe the error? Try to set a breakpoint at onInvalidMemoryOperationError https://github.com/dlang/druntime/blob/master/src/core/exception.d#L559 and see what stack leads to it. Unfortunately for having deterministic memory management, I would essentially need to develop GC-less, and would loose classes. This means many nice features of D aren't available, e.g. I couldn't use interfaces (AFAIK they don't work on structs) or constraints. Not necessarily. You only need to dispose the resources in time, like in C#. But if you don't have destructors, you have nothing to dispose. Strangely after switching from the GDC compiler to the LDC compiler, all crashes observed at Ubuntu are gone. Sounds not good.
Re: How to debug (potential) GC bugs?
On Sunday, 25 September 2016 at 16:23:11 UTC, Matthias Klumpp wrote: For Ubuntu, some modifications on the code were needed, and apparently for them the code is currently crashing in the GC collection thread: http://paste.debian.net/840490/ Oh, wait, what do you mean by crashing?
Re: How to debug (potential) GC bugs?
If it's heap corruption, GC has debugging option -debug=SENTINEL - for buffer overrun checks. Also that particular stack trace shows that object being destroyed is allocated in bin 512, i.e. its size is between 256 and 512 bytes.
Re: How to kill whole application if child thread raises an exception?
On Wednesday, 26 October 2016 at 10:03:30 UTC, dm wrote: Why so strange default behavior do not kill other threads in case some of threads raise exception? But thanks anyway. AFAIK, on posix you should join the child thread, and when you do, the stored exception is rethrown in the joining thread.
Re: Visual Studio Linker Problem
On Tuesday, 18 October 2016 at 18:18:16 UTC, Jason C. Wells wrote: I'm not sure where LIB was set. At least in vs2013 it's taken from registry somewhere HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Microsoft SDKs\Windows\v8.1 (maybe v10 in your case).
Re: dmd 2.072.0 beta 2 no size because of forward reference
https://github.com/dlang/dmd/pull/5500 maybe this
How to muldiv in D?
Can't find a function for it.
Re: How to muldiv in D?
Yep, I need muldiv for long values on x86-64.
Re: Char representation
On Tuesday, 22 November 2016 at 13:29:47 UTC, RazvanN wrote: Given the following code: char[5] a = ['a', 'b', 'c', 'd', 'e']; alias Range = char[]; writeln(is(ElementType!Range == char)); One would expect that the program will print true. In fact, it prints false and I noticed that if Range is char[], wchar[], dchar[], string, wstring, dstring Unqual!(ElementType!Range) is dchar. I find it odd that the internal representation for char and string is dchar. Is this a bug? Here's the reading: https://forum.dlang.org/post/nh2o9i$hr0$1...@digitalmars.com
Re: spam in bugzilla
Maybe connect a service like https://twitter.com/StopForumSpam ?
Re: Catch block not hit in unittest
Linux? Probably another bug.
Try this:
unittest
{
import core.exception : UnicodeException;
void f()
{
string ret;
int i = -1;
ret ~= i;
}
try
{
f();
}
catch(UnicodeException e)
{
assert(e.msg == "Invalid UTF-8 sequence");
}
}
Re: How to create a UTF16 text file on Windows?
On Wednesday, 16 November 2016 at 22:43:55 UTC, lafoldes wrote:
Hi,
I'd like to create a UTF16 text file on Windows 7, using
std.stdio.File and std.stdio.File.write... functions (so no
binary write, no Win32 functions).
I was experimenting with variations of this code…:
import std.stdio;
int main(string[] argv)
{
auto output = File("wide_text.txt", "wt");
output.writeln!wstring("A"w);
return 0;
}
What C runtime do you use?
Re: an extremely naive question regarding synchronized...
static MySingleton get() {
if (instance_ is null) {
synchronized {
if (instance_ is null) {
atomicStore(instance_, new MySingleton);
}
}
}
return instance_;
}
This should work fine and faster.
Re: Why is three safety levels need in D?
On Thursday, 17 November 2016 at 17:18:27 UTC, Nordlöw wrote: Why does D need both `@safe`, `@trusted` and `@system` when Rust seems to get by with only safe (default) and `unsafe`? Rust has 3 levels of safety: the code inside unsafe block is @system, and the unsafe block as a whole is a @trusted wrapper providing safe interface to be called by safe code. The rationale for function-level safety is better encapsulation: the function accesses only its parameters and nothing more, but unsafe block has access to all visible local variables of its function, not only those it works with. D supports Rust-style unsafe blocks with @trusted lambdas.
Re: Memory allocation failed. Why?
On Monday, 21 November 2016 at 11:22:40 UTC, ag0aep6g wrote: Who could "someone" be? It's a self-contained example, and buf doesn't leave the test function. Anything in .data and .bss sections and stack. See https://issues.dlang.org/show_bug.cgi?id=15723 As for GC compaction: https://issues.dlang.org/show_bug.cgi?id=3284
Re: RDMD can't eval code because of missing cstream module
https://github.com/dlang/tools/commit/5ed4f176f41b7559c64cf525c07ccf13ca3a5160 this?
Re: ACM paper: CPU is the new bottleneck
On the other hand if you do more IO, you can have higher CPU load due to compression and serialization.
Re: When to call GC.{add,remove}Range in containers?
On Monday, 10 October 2016 at 07:12:10 UTC, Nordlöw wrote: should not be scanned by the GC. Shouldn't be a problem.
Re: [Semi-OT] I don't want to leave this language!
On Monday, 5 December 2016 at 20:25:00 UTC, Ilya Yaroshenko wrote: Good D code should be nothrow, @nogc, and betterC. BetterC means that it must not require DRuntime to link and to start. Without runtime you won't have asserts (C has them), bounds checking, array casts, string switch. Doesn't sound good to me. And why is it a requirement at all? C and C++ already depend on their quite huge runtimes already. Why D shouldn't?
Re: BetterC classes
On Friday, 16 December 2016 at 18:29:33 UTC, Ilya Yaroshenko wrote: Undefined symbols for architecture x86_64: "__D14TypeInfo_Class6__vtblZ", referenced from: __D8cppclass2Hw7__ClassZ in cppclass-7ed89bd.o By using typeid you request the class' TypeInfo, and it pulls quite a lot.
Re: BetterC classes
It looks more like a reference from C++ class TypeInfo to Class TypeInfo vtable, which is legit since the C++ class TypeInfo is a D class derived from Class TypeInfo. What's not good is a reference to the C++ class TypeInfo in the first place.
Re: BetterC classes
On Thursday, 22 December 2016 at 09:01:21 UTC, Kagamin wrote: It looks more like a reference from C++ class TypeInfo to Class TypeInfo vtable, which is legit since the C++ class TypeInfo is a D class derived from Class TypeInfo. Or just an instance of Class TypeInfo, so its initializer needs Class TypeInfo vtable.
Re: COM2D Wrapper
On Monday, 27 March 2017 at 21:02:05 UTC, Nierjerson wrote: Anyone can help get this working? I think the issue maybe that the interface pointer returned by the COM interface is "C-like" and doesn't match what D expects an interface to be. I get access violations when trying to call the functions on the returned interfaces. Not sure about this though. First write code that works, then write generator for it. It won't work the other way around.
Re: std.digest toHexString
On Monday, 20 March 2017 at 15:46:10 UTC, Adam D. Ruppe wrote: On Monday, 20 March 2017 at 15:38:26 UTC, Kagamin wrote: This explicit slice won't work, because a slice of a fixed size array results in a fixed size array. No, it doesn't. int[4] a; typeof(a[] == int[]) You can try yourself in the compiler, it is easy to verify. https://dpaste.dzfl.pl/eafa86c5426d
Re: Is it std.regex, or is it me.
A file stream would be another example of a thing that can't be naturally const even if you opened it for reading.
Re: std.digest toHexString
On Monday, 20 March 2017 at 04:03:20 UTC, Vladimir Panteleev wrote: https://issues.dlang.org/show_bug.cgi?id=9279 Has it not been fixed? That's specific to the return statement. Like you can assign an address of a local variable, but you can't return it.
Re: std.digest toHexString
On Thursday, 16 March 2017 at 17:50:45 UTC, Adam D. Ruppe wrote: string s = func()[]; // I'd allow it, at least the user wrote `[]` meaning they realized it was stack data and presumably knows what that means about the slice's lifetime This explicit slice won't work, because a slice of a fixed size array results in a fixed size array. There's no reason to allow this buggy code though. Also programmer didn't necessarily mean it. It could be a typographic error or a result of refactoring. Even if programmer wanted to write invalid code, what for? Yet this particular code doesn't need to be allowed to allow writing invalid code: one can still cast a number to pointer and do whatever he wants.
Re: how to make interface with return auto
Or if you want to completely abstract it: https://forum.dlang.org/post/iqxkelatusfocfotp...@forum.dlang.org
Re: Testing D codes
Same as anywhere else. Integration test is a test that connects to a deployed system, which is different from unittest only in philosophical aspect.
Re: is char[] faster than string?
On Wednesday, 5 April 2017 at 21:58:16 UTC, Inquie wrote: What I am looking for is something like StringBuilder in C#. If you want it to not copy data on expand, there's nothing like that in D yet. I wrote one for myself :)
Re: Testing D codes
https://github.com/ikod/dlang-requests/blob/master/tests/app.d
Re: Testing D codes
On Thursday, 6 April 2017 at 13:49:11 UTC, Russel Winder wrote: Is there any need for the unittest block in the application created to run the integration tests? If you don't care to call each and all of them by hand. Test frameworks are handy for extensive testing, builtin unittests work best for the most basic stuff.
Re: GC: Understanding potential sources of false pointers
https://issues.dlang.org/show_bug.cgi?id=15723
Re: GC: Understanding potential sources of false pointers
On Thursday, 20 April 2017 at 20:26:06 UTC, Nick Sabalausky (Abscissa) wrote: (even if it's from a C lib) Same for D: .rdata is fine, but afaik you have only strings there, the rest - .data, .bss, .tls will suffer the same issue.
Re: Best way to manage non-memory resources in current D, ex: database handles.
Unique is probably not good for database connection: you then can't have connection in two variables, also if it holds a reference to GC-allocated memory, it can't be put to GC-allocated memory, since when that GC-allocated memory is collected, Unique will try to destroy its possibly already freed object resulting in use after free. RefCounted is ok, it has calls to GC in order to be scanned for GC references, though destructors during collection are called in a different thread, so the counter can be decremented incorrectly. Phobos tends to have specialized types like File and RcString, but they have the same problem with reference counting during collections.
Re: Best way to manage non-memory resources in current D, ex: database handles.
RefCounted is ok If GC methods it calls are legal during collection.
Re: Always std.utf.validate, or rely on exceptions?
On Thursday, 2 March 2017 at 17:03:01 UTC, Kagamin wrote: Functions working with strings usually assume valid utf and can behave incorrectly on malformed utf. Or rather they report an unrecoverable error terminating the process.
Re: Always std.utf.validate, or rely on exceptions?
On Thursday, 2 March 2017 at 16:20:30 UTC, SimonN wrote: Should I always validate text from files manually with std.utf.validate? Or should I memorize which functions throw, then validate manually whenever I call the non-throwing UTF functions? What is the pattern behind what throws and what asserts false? If you expect file with malformed utf that can cause you trouble and want to handle it gracefully, pass its content through validator and catch exception from validator. Functions working with strings usually assume valid utf and can behave incorrectly on malformed utf.
Re: Best memory management D idioms
On Sunday, 5 March 2017 at 20:54:06 UTC, XavierAP wrote: What I want to learn (not debate) is the currently available types, idioms etc. whenever one wants deterministic memory management. There's nothing like that of C++. Currently you have Unique, RefCounted, scoped and individual people efforts on this. BTW, do you want to manage non-memory resources with these memory management mechanisms too?
Re: D Debug101
People who don't use IDE, use printf debugging.
Re: D Debug101
gdb wants dwarf debug info, windows uses codeview.
Re: Is std.xml seriously broken, or is it me?
On Sunday, 30 July 2017 at 03:16:35 UTC, Mike wrote: It appears `onStartTag` does not handle the root element. Looks like a bug. Until the module is replaced, bug reports are still accepted for it.
Re: Does anyone understand how to use "shared" types with concurrency send/receive functions?
On Tuesday, 15 August 2017 at 15:19:02 UTC, Steven Schveighoffer wrote: However, I'm not sure about the postblit being called afterward. Does a postblit need to be marked shared in order to work for shared types? Ideally yes, but it's difficult to come up with a good shared postblit, send and receive is probably the only use case for it :)
Re: Does anyone understand how to use "shared" types with concurrency send/receive functions?
On Tuesday, 15 August 2017 at 21:27:49 UTC, Arek wrote:
Yes, but this doesn't compile:
import std.stdio;
import std.concurrency;
struct A
{
int t;
int r;
int method() shared
{
return 0;
}
}
void consumer()
{
shared a = receiveOnly!(shared A)();
}
void main()
{
auto cons = spawn();
send(cons, shared A());
}
AIU you use struct as a Unique-like wrapper for shared class
object. Extract the object and send it, then wrap again on
arrival.
Re: Does anyone understand how to use "shared" types with concurrency send/receive functions?
https://github.com/dlang/phobos/blob/master/std/variant.d#L623 memcpy(, cast(const(void*)) , rhs.sizeof); should be ok to cast unconditionally
Re: Does anyone understand how to use "shared" types with concurrency send/receive functions?
On Wednesday, 16 August 2017 at 12:58:25 UTC, Steven Schveighoffer wrote: Use cases don't matter. What matters is: is it proper for Variant to call the postblit (as it does currently) without regard for the qualifiers? Looks like it isn't, https://dpaste.dzfl.pl/183e6dae9867 - shared reference counter with (probably) good enough postblit.
Re: Does anyone understand how to use "shared" types with concurrency send/receive functions?
On Monday, 14 August 2017 at 20:13:28 UTC, Arek wrote: If I can ensure the uniqueness of the object, there is no need to "share" it or synchronize the access. You use manually managed multithreading, that's why you need shared. And because compiler can't verify uniqueness, you are requested to do it manually by casting.
Re: Does anyone understand how to use "shared" types with concurrency send/receive functions?
On Monday, 14 August 2017 at 22:22:58 UTC, Arek wrote:
I've found some simple workaround for this problem:
import std.stdio;
import std.concurrency;
struct Envelope(T) if (is(T == class)) // for simplicity of
this example, only classes
{
shared(T)[] obj;
this(shared T o)
{
this.obj = [o];
}
T get() @property nothrow @nogc
{
return cast() obj[0];
}
}
class A
{
}
void consumer()
{
auto r = receiveOnly!(Envelope!(A))();
writeln("Got: ", typeof(r).stringof);
}
void main()
{
auto cons = spawn();
auto o = Envelope!A(new A());
send(cons, o);
}
Shared object can be encapsulated in the array. In case of
other (non-class) types the pointer can be used, and get()
should return ref to the pointed object (after stripping off
the shared qualifier).
Rather like this:
struct Sendable(T)
{
shared T o;
alias o this;
}
import std.concurrency;
class A
{
int method() shared;
}
void consumer()
{
shared A a = receiveOnly!(Sendable!(A))();
}
void producer()
{
auto cons = spawn();
shared A a = new shared A();
send(cons, Sendable!A(a));
}
Re: Does anyone understand how to use "shared" types with concurrency send/receive functions?
Well, no wrapper is actually needed here:
class A
{
int method() shared;
}
void consumer()
{
shared a = receiveOnly!(shared A)();
}
void producer()
{
auto cons = spawn();
send(cons, new shared A());
}
Re: Does anyone understand how to use "shared" types with concurrency send/receive functions?
On Wednesday, 16 August 2017 at 13:14:55 UTC, Steven Schveighoffer wrote: But that isn't a concern for Variant. It is only calling the postblit, which does work. Shouldn't it call destructor when it goes out of scope?
Re: C style 'static' functions
On Wednesday, 19 July 2017 at 15:28:50 UTC, Steven Schveighoffer wrote: I'm not so sure of that. Private functions still generate symbols. I think in C, there is no symbol (at least in the object file) for static functions or variables. They generate hidden symbols. That's just how it implements private functions in C: you can't do anything else without mangling. You probably can't compile two C units into one object file if they have static functions with the same name - this would require mangling to make two symbols different.
Re: unittest blocks not being run inside of class and struct templates
On Tuesday, 25 July 2017 at 02:48:57 UTC, NoBigDeal256 wrote:
What is the standard way of testing class templates in the
context of a library where some of the classes may never
actually be used by the library itself?
Write a test and instantiate whatever templates you want to test.
class Test(T) {
}
unittest {
auto t=new Test!int;
assert(t.method1()==1);
}
Re: Why structs and classes instanciations are made differently ?
On Tuesday, 25 July 2017 at 15:56:45 UTC, Houdini wrote: Yes, but it isn't the default way in C++ to do dynamic instanciation. https://github.com/isocpp/CppCoreGuidelines this? It's only 2 years old. The new operator predates it by decades.
Re: Why structs and classes instanciations are made differently ?
On Monday, 24 July 2017 at 15:21:54 UTC, Houdini wrote: D is very similar to C++ (and also grabs godd ideas from Python), but I have a naive question : why does Walter Bright chose to instanciate classes like in Java ? C++ is big, there's always something you don't know about it. Java actually instantiates classes the C++ way: http://en.cppreference.com/w/cpp/language/new
Re: C style 'static' functions
Try a newer compiler, this was fixed recently.
Re: C++ Interfacing:'static' array function parameter contradiction
Report a bug.
Re: GC: Understanding potential sources of false pointers
They are for static data an thread-local storage.
Re: using shared effectively in a producer/consumer situation.
On Sunday, 23 April 2017 at 20:33:48 UTC, Kevin Balbas wrote: Is this the correct way to do it? cast to shared, send to main thread, cast away shared? Yes, as long as the thing is unique, you can cast it to shared or immutable just fine.
Re: OT: What causes the Segfault in the following?
On Friday, 4 August 2017 at 02:38:10 UTC, Andrew Edwards wrote: OK, I was is indeed the problem. I was thinking for some reason that s gets initialized inside nk_color_hex_rgb() Usually C functions don't allocate memory. And when they do, they do it in unique ways, which is a PITA, that's why the caller is usually responsible for memory management.
Re: Does anyone understand how to use "shared" types with concurrency send/receive functions?
https://issues.dlang.org/show_bug.cgi?id=6585 is this fixed too? How various opIndex will behave now?
Re: Does anyone understand how to use "shared" types with concurrency send/receive functions?
On Wednesday, 16 August 2017 at 23:15:10 UTC, crimaniak wrote: I wonder if it possible and usable to make some template to support this pattern, where we give mutex(es), shared object(s) and delegate to operate with objects as non-shared. https://dpaste.dzfl.pl/8b3b05c8ec0a like this? Not sure if it helps, don't forget that it's a casted shared object.
Re: Cannot implicitly convert expression (struct this)
On Thursday, 22 June 2017 at 09:57:44 UTC, Andre Pany wrote:
This line raises the error:
TestStruct s2 = TestStruct(Reason.FU);
Error: cannot implicitly convert expression ("Fu") of type
Reason to InitialEnum!(Reason)
While this line is working fine:
TestStruct s1 = {reason: Reason.FU};
I think these should be equivalent, report a bug.
Re: How to get rid of const / immutable poisoning (and I didn't even want to use them...)
https://dpaste.dzfl.pl/74d67cfca3e8
Re: Searching strings with indexOf vs countUntil
I would guess indexOf returns a value suitable for indexing, therefore it counts code units, while countUntil counts range elements - code points in case of a string. Also number of code points is not suitable for indexing an utf8 string, it can be used to allocate a dstring, but not so much for anything else. What do you use the resulting value for?
Re: difference between x = Nullable.init and x.nullify
On Saturday, 3 June 2017 at 06:19:29 UTC, Jonathan M Davis wrote: Assigning Nullable!Test.init is equivalent to setting the internal value to Test.init and setting _isNull to false. Eh? Does it mean Nullable is default initialized to some non-null default value?
Re: difference between x = Nullable.init and x.nullify
On Sunday, 4 June 2017 at 08:51:44 UTC, Jonathan M Davis wrote: On Saturday, 3 June 2017 at 06:19:29 UTC, Jonathan M Davis wrote: > Assigning Nullable!Test.init is equivalent to setting the > internal value to Test.init and setting _isNull to false. T _value; bool _isNull = true; So it was a typo that Nullable.init sets _isNull to false?
Re: Generic operator overloading for immutable types?
On Tuesday, 13 June 2017 at 19:29:26 UTC, Gary Willoughby wrote: Is it possible for the `result` variable in the following code to be returned as an immutable type if it's created by adding two immutable types? Why do you even want that? Such plain data structure is implicitly convertible to any const flavor: https://dpaste.dzfl.pl/c59c4c7131b2
Re: alloca without runtime?
You can try ldc and llvm intrinsics http://llvm.org/docs/LangRef.html#alloca-instruction http://llvm.org/docs/LangRef.html#llvm-stacksave-intrinsic
Re: Access Violation when passing the result of a C function directly to a D function?
On Friday, 15 September 2017 at 04:01:13 UTC, Timothy Foster wrote: am I required to save the result of a C function to variable before passing it into another function or? No. You probably have stack corruption. Does it crash if FMOD_System_Create returns ok?
Re: Bug in D!!!
It can't work this way. You can try std.variant.
Re: Protection attribute in another module
Something like mixin("__traits(getProtection, A."~member~")")
Re: dispatcher
On Wednesday, 6 September 2017 at 05:57:18 UTC, Psychological Cleanup wrote: I'm thinking that I might have to create an extra thread that monitors for when a call needs to occur and does so. Would work. If your code doesn't conflict with GC, it's fine to work in an unregistered thread.
Re: wrapping a C style delegate
You're not specific enough. What would be semantics of such wrapper?
Re: Bug in D!!!
On Thursday, 31 August 2017 at 00:49:22 UTC, EntangledQuanta wrote: I've already implemented a half ass library solution. It can be improved alot.
Re: Transitive const and function pointers/delegates
It's const(int delegate(char))
Re: xml utf-8 encoding error
On Tuesday, 29 August 2017 at 04:41:34 UTC, graw-prog wrote: < Content-Type: text/xml; charset="utf-8" Should be Content-Type: text/xml; charset=utf-8
Re: Protection attribute in another module
You iterate over string literals: https://dlang.org/spec/traits.html#allMembers
Re: Deprecation of toUTF16
import std.conv; auto ws=s.to!wstring;
Re: xml utf-8 encoding error
On Tuesday, 29 August 2017 at 15:55:50 UTC, Adam D. Ruppe wrote:
http://dpldocs.info/experimental-docs/source/std.net.curl.d.html#L2470
Ow, annotated sources, cool.
pre {
box-sizing: border-box;
overflow: auto;
max-width: 800px; /* The script sets the real one */
max-width: calc(80vw - 16em - 4em);
}
Hmm... AFAIK free side space on pages is left so that the content
is not too wide in characters, not because people like free side
space :) But for preformatted text such limit makes little sense,
it's only for word-wrapped text. I'd say code should take all the
width it wants.
Re: ESR on post-C landscape
Also http://ithare.com/chapter-vb-modular-architecture-client-side-programming-languages-for-games-including-resilience-to-reverse-engineering-and-portability/ scroll to the part about language choice.
Re: weird exception on windows
On Friday, 15 December 2017 at 21:56:48 UTC, Steven Schveighoffer wrote: On 12/15/17 10:08 AM, Kagamin wrote: Maybe this https://issues.dlang.org/show_bug.cgi?id=18084 Thanks for looking into this. I created a PR to fix. Szabo, can you please try with this patch and see if it fixes your issue? https://github.com/dlang/phobos/pull/5932 -Steve Regression in 2.072?
Re: Clarity about extern(Windows)/extern(System)
On Sunday, 17 December 2017 at 13:36:15 UTC, Mike Parker wrote: My limited testing on a 64-bit Linux VM shows no problems when binding a C function as extern(C) or extern(Windows), and the disassembly looks the same. 64-bit ABI fixed calling convention proliferation, only one cc is used there.
Re: Why is there no std.stream anymore?
Or this https://run.dlang.io/is/MO9Wiy
Re: Why is there no std.stream anymore?
On Monday, 11 December 2017 at 23:33:44 UTC, Seb wrote:
---
void main(string[] args)
{
import std.conv, std.range, std.stdio;
foreach (d;
File(__FILE_FULL_PATH__).byChunk(4096).join.take(5)) {
writefln("%s", d.to!char);
}
}
---
A variant: https://run.dlang.io/is/2TUQBv
Re: Global variable type does not match previous declaration
On Wednesday, 13 December 2017 at 21:38:49 UTC, Satoshi wrote: What means this error and how to solve it? object.d-mixin-1072(1112): Error: Global variable type does not match previous declaration with same mangled name: _D10TypeInfo_m6__initZ Try to write typeinfo as is without mixin.
Re: weird exception on windows
writeln(fileName);
if (!fileName.exists)
{
return;
}
:)
Re: Clarity about extern(Windows)/extern(System)
From https://gcc.godbolt.org/
__attribute__((stdcall))
int square(int num) {
return num * num;
}
_Z6squarei:
push ebp
mov ebp, esp
mov eax, DWORD PTR [ebp+8]
imul eax, DWORD PTR [ebp+8]
pop ebp
ret 4
Re: Clarity about extern(Windows)/extern(System)
https://gcc.gnu.org/onlinedocs/gcc-7.2.0/gcc/x86-Function-Attributes.html#index-functions-that-pop-the-argument-stack-on-x86-32-3 looks like gcc doesn't see it as OS dependent.
Re: Write native GUI applications for Windows
On Monday, 18 December 2017 at 10:08:13 UTC, Andrey wrote: Is core.sys.windows.windows equals fully to C WinApi, do you know? Should be enough for most things.
Re: weird exception on windows
You said tests fail?
class SourceResult
{
private const
{
string file;
size_t line;
}
this(string fileName = __FILE__, size_t line = __LINE__, size_t
range = 6) nothrow
{
this.file = fileName;
this.line = line;
if (!fileName.exists)
{
return;
}
}
}
unittest
{
auto result = new SourceResult("test/values.d", 26);
auto msg = result.file;
}
Does this fail too?
Re: weird exception on windows
You can also try to call `exists` somewhere before this part of code.
Re: weird exception on windows
Try printf debugging in case argument is invalid.
Re: weird exception on windows
Maybe this https://issues.dlang.org/show_bug.cgi?id=18084
Re: weird exception on windows
That said, tempCString code is suspicious: https://github.com/dlang/phobos/blob/master/std/internal/cstring.d#L221 If unittest-versioned exists calls release-versioned tempCString, it will corrupt the stack. Try to replace 16 with 256 there and recompile your code.
Re: Class instance becoming null after calling bindings to C code???
And https://github.com/Extrawurst/DerelictFmod/issues/1
Re: COM/OLE advanced questions
On Thursday, 2 November 2017 at 14:22:56 UTC, Guillaume Piolat wrote: Question 1. Is it mandatory to inherit from core.sys.windows.unknwn.IUnknown, or just having an interface named "IUnknown" validate it for being a COM interface? If yes, then how am I supposed to use COM interfaces in other OSes? core.sys.windows.unknwn.IUnknown is defined under version(Windows). I suppose you will need a bunch of definitions. One strange thing is that core.sys.windows defines GUID with alignment 1, which I expect to differ on other platforms. I wonder what the exact compiler hook is. I only looks at the name. Question 2. If this fails, may I emulate COM vtable layout with extern(C++) class? I wonder what the exact differences are anyway between extern(C++) and the special IUnknown. Depends on implementation. XPCOM uses straight C++ ABI on linux, so look what you want to work with. Question 3. It seems I can inherit both from A D object and a COM interface. What will be the choosen layout? Shouldn't matter, interface defines ABI, how it's implemented is irrelevant - that's the very idea behind COM. It's actually legal to implement interfaces with composition, the caller still doesn't see anything.
Re: Parallel reads on std.container.array.Array
On Friday, 8 December 2017 at 07:34:53 UTC, Arun Chandrasekaran wrote: I was wondering if std.container.array.Array supports threadsafe parallel reads similar to std::vector. No, your code can also fail on a system with inconsistent cache because data written by writing thread can remain in its cache and not reach shared memory in time or reading threads can read from their stale cache.
Re: Check whether a file is empty.
Other functions that can be used for this are GetFileInformationByHandle, GetFileSizeEx, SetFilePointerEx or File.size in phobos.
Re: Shared and race conditions
On Wednesday, 29 November 2017 at 16:13:13 UTC, Wanderer wrote:
static void getId(shared IdGen!(MyId)* g)
{
writeln("next: ", g.next());
writeln("next: ", g.next());
}
writeln synchronizes on stdout, so your code is mostly
serialized, good example of a very subtle race condition.
Re: Shared and race conditions
A lock on stdout works as a barrier: threads may hit it simultaneously, but pass it one by one in a queue with a time gap between them.
