测试libstdc ++的版本是否使用符合C ++ 11的std :: string [英] Test whether libstdc++'s version uses a C++11-compliant std::string

问题描述

我编写一些C ++ 11代码，假设有关 std :: string 的属性是有效的，但表示在C + +11。在早些时候，libstdc ++的 basic_string 实现符合98/03的要求，但不符合更严格的C ++ 11要求。

根据我的理解，libstdc ++修复了 basic_string 的问题。问题是有很多版本的库，人们使用它不实现这个修复。我的代码可能会以许多不愉快的方式默默地失败。

我想有一个 static_assert 用户试图编译我的库对那些不相容的版本的libstdc ++。如何检测版本，同样重要的是，我应该查找哪个版本？

解决方案

std :: string 引入了新的（双）ABI在GCC 5（

宏 _GLIBCXX_USE_CXX11_ABI 旧的或新的ABI正在使用，因此只需检查：

  #if _GLIBCXX_USE_CXX11_ABI 
  
 
 
 
当然只有libstdc ++。
 
I'm writing some C++11 code that makes assumptions about the nature of std::string that are valid, but represent behavior that was changed in C++11. In the earlier days, libstdc++'s basic_string implementation conformed to the 98/03 requirements, but not to the more strict C++11 requirements.

As I understand it, libstdc++ has fixed the issues around basic_string. The problem is that there are many versions of the library that people use which do not implement this fix. And my code may silently fail in many unpleasant ways on them.

I would like to have a static_assert fire if the user attempts to compile my library against those non-conformant versions of libstdc++. How do I detect the version, and equally importantly, which version should I look for?
解决方案
The new C++11 compliant std::string was introduced with the new (dual) ABI in GCC 5 (Runtime Library Section of the changelog).

The macro _GLIBCXX_USE_CXX11_ABI decides whether the old or new ABI is being used, so just check it:
#if _GLIBCXX_USE_CXX11_ABI
Of course that's specific to libstdc++ only.

                        
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