[llvm-bugs] [Bug 32166] New: [feature request] requires clause in functions (concepts TS)

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32166

            Bug ID: 32166
           Summary: [feature request] requires clause in functions
                    (concepts TS)
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Formatter
          Assignee: unassignedclangb...@nondot.org
          Reporter: gonzalob...@gmail.com
                CC: djas...@google.com, kli...@google.com,
                    llvm-bugs@lists.llvm.org

This code

template <bool IsConst>
struct A {
  void prev() 
  requires BidirectionalIterator<iterator_t<IsConst>>() &&
           BidirectionalIterator<iterator_t<IsConst>>() &&
           BidirectionalIterator<iterator_t<IsConst>>() 
  { --it_; }
};

gets formatted into: 

template <bool IsConst>
struct A {
  void prev() requires BidirectionalIterator<iterator_t<IsConst>>() &&
      BidirectionalIterator<iterator_t<IsConst>>() &&
      BidirectionalIterator<iterator_t<IsConst>>() {
    --it_;
  }
};

I don't see a reason why the options specified in #32165 shouldn't apply here
as well. 

Also:
https://github.com/CaseyCarter/cmcstl2/blob/43b63f6846d80bcd1867f512519bc18841bd961e/include/stl2/detail/iterator/operations.hpp#L25

this code: 

template <class I>
requires
        Iterator<I>()
        // Pre: 0 <= n && [i,i+n)
constexpr void impl(I& i, difference_type_t<I> n)
noexcept(noexcept(++std::declval<I&>()))
{
    STL2_EXPECT(0 <= n);
    while (n != 0) {
        --n;
        ++i;
    }
}

gets formatted into 

template <class I>
requires Iterator<I>()
    // Pre: 0 <= n && [i,i+n)
    constexpr void impl(I& i, difference_type_t<I> n) noexcept(
        noexcept(++std::declval<I&>())) {
  STL2_EXPECT(0 <= n);
  while (n != 0) {
    --n;
    ++i;
  }
}

(Note how the constexpr keywords is not aligned with the template keyword).

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