将std :: __ cxx11 :: string转换为std :: string [英] Converting std::__cxx11::string to std::string

问题描述

我使用c + + 11，但也有一些库没有配置它，需要一些类型转换。特别是我需要一种方法将 std :: __ cxx11 :: string 转换为常规 std :: string ，但googling我找不到一个办法做这个，并把（string）在前面不工作。

如果我不转换我得到链接器错误，像这样：

 未定义的引用`H5 :: CompType :: insertMember __cxx11 :: basic_string< char，std :: char_traits< char>，std :: allocator< char>> const& unsigned long，H5 :: DataType const&）const'
  
 
 
解决方案
是否可能使用GCC 5？
 
 
如果你得到关于未定义的涉及std :: __ cxx11命名空间中的类型或标签[abi：cxx11]的符号的链接器错误，那么它可能表示你正在尝试链接对象使用_GLIBCXX_USE_CXX11_ABI宏的不同值编译的文件。这通常发生在链接到使用旧版本的GCC编译的第三方库时。如果第三方库无法使用新的ABI重建，则需要使用旧的ABI重新编译代码。
 
 
源： GCC 5版本说明/ Dual ABI  
 
 
 
定义之前包括任何标准库头文件的宏应该可以解决您的问题： #define _GLIBCXX_USE_CXX11_ABI 0  
 
I use c++11, but also some libraries that are not configured for it, and need some type conversion. In particular I need a way to convert std::__cxx11::string to regular std::string, but googling I can't find a way to do this and putting (string) in front does not work.

If I do not convert I get linker errors like this:
undefined reference to `H5::CompType::insertMember(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long, H5::DataType const&) const'

解决方案
Is it possible that you are using GCC 5?

  
If you get linker errors about undefined references to symbols that involve types in the std::__cxx11 namespace or the tag [abi:cxx11] then it probably indicates that you are trying to link together object files that were compiled with different values for the _GLIBCXX_USE_CXX11_ABI macro. This commonly happens when linking to a third-party library that was compiled with an older version of GCC. If the third-party library cannot be rebuilt with the new ABI then you will need to recompile your code with the old ABI.
Source: GCC 5 Release Notes/Dual ABI

Defining the following macro before including any standard library headers should fix your problem: #define _GLIBCXX_USE_CXX11_ABI 0

                        
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