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Subject: Re: [boost] [iterator][type_traits] A test is failing with gcc in c++03mode
From: John Maddock (jz.maddock_at_[hidden])
Date: 2016-12-17 13:19:35

On 17/12/2016 16:45, Peter Dimov wrote:
> 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
> However, __is_abstract is nonstandard, so who knows what it does. It
> might be worth trying -std=gnu++03 instead of -std=c++03.

I think the issue here is that you are calling
__is_abstract(malformed_type) - so when the compiler instantiates
std::pair<int&, std::string&> to see if it's abstract or not the error
gets generated. But I'm not sure that helps ;)


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