Re: [boost] [iterator][type_traits] A test is failing with gcc in c++03mode

Subject: Re: [boost] [iterator][type_traits] A test is failing with gcc in c++03mode
From: Peter Dimov (lists_at_[hidden])
Date: 2016-12-17 11:45:50

Edward Diener wrote:
> The zip_iterator_test_std_pair is failing with gcc in c++-03 mode. The 
> problem reduces viqa Boost type traits to the fact that in gcc c++03 mode 
> the expression:
>
> __is_abstract(std::pair<int&, std::string&>)
>
> where __is_abstract is a compiler intrinsic, gives an error of:
>
> error: forming reference to reference type 
> 'std::__cxx11::basic_string<char>&'
>         pair(const _T1& __a, const _T2& __b)
>         ^~~~
>
> Is this a valid error according to the C++ 2003 standard ?

References to references were invalid in C++98, but were made conditionally 
valid in C++03 by

http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#106

However, __is_abstract is nonstandard, so who knows what it does. It might 
be worth trying -std=gnu++03 instead of -std=c++03.