[PATCH] Extend std::copy/std::copy_n char* overload to deque iterator

[Jonathan Wakely]

On 22/05/20 22:57 +0200, François Dumont via Libstdc++ wrote:
>On 21/05/20 2:17 pm, Jonathan Wakely wrote:
>>
>>Why is the optimization not done for C++03 mode?
>>
>I did it this way because the new std::copy overload rely on 
>std::copy_n implementation details which is a C++11 algo.
>
>
>>It looks like the uses of 'auto' can be reaplced easily, and
>>__enable_if_t<> can be replaced with __gnu_cxx::__enable_if<>::__type.
>>
>But yes, we can indeed provide those implementation details in pre-C++11.
>
>This is what I've done in this new version.
>
>Tested under Linux x86_64 in default c++ mode.
>
>I tried to use CXXFLAGS=-std=c++03 but it doesn't seem to work even if 
>I do see the option in build logs. I remember you adivised a different 
>approach, can you tell me again ?

See the documentation:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/test.html#test.run.permutations