[cfe-dev] Range for loop and custom container

[János Hack]

Hi all,
Please consider this example:


template<typename T>
struct vec{};

namespace std
{
  template<typename T>
  T* begin(vec<T>& a)
  {
    return 0;
  }

  template<typename T>
  T* begin(const vec<T>& a)
  {
    return 0;
  }

  template<typename T>
  T* end(vec<T>& a)
  {
    return 0;
  }

  template<typename T>
  T* end(const vec<T>& a)
  {
    return 0;
  }
}

using namespace std;

int main()
{
  vec<char> vecDef;
  for(auto it:vecDef);

  return 0;
}

clang compile: clang++ -std=c++11 rangedfor.cpp (the code above)
result:rangedfor.cpp:37:14: error invalide range expression of type
'vec<char>'; no viable 'begin' function available

i already read
http://comments.gmane.org/gmane.comp.compilers.clang.devel/31712 but in
that, he creates a new begin and her,e i create an overload and this is
enabled:

http://en.cppreference.com/w/cpp/iterator/begin  see  User-defined overloads
part

The question is: am i intepret this wrong or this is a bug or what? the g++
, and visual c++ compile this code without a question.

clang version: 26 May 2015   3.6.1
release windows, but in linux the same problem stands

Thanks János
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