Now tested in C++98 mode, there was indeed a small problem.

I even wonder if I shouldn't have extend the std::copy overload to any 
call with deque iterator as the output so that it is transform into an 
output to pointer.

Ok to commit ?

François

On 23/05/20 6:37 pm, Jonathan Wakely wrote:
> 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 
>
>
>