std :: stoi不存在于g ++ 4.6.1在MinGW上 [英] std::stoi doesn't exist in g++ 4.6.1 on MinGW

问题描述

我尝试编译这个简单程序在IdeOne （使用gcc 4.5.1）和我的Linux计算机（使用4.6 .4）：

  #include< string> 
 #include< iostream> 
 
 int main（）{
 std :: cout< std :: stoi（32）<< std :: endl; 
} 
  

它完美编译，输出 32 。但是，当我试图在我的Windows计算机上编译它与MinGW和gcc 4.6.1，我得到这个错误：

  test .cpp：在函数'int main（）'：
 test.cpp：5：19：错误：'stoi'不是'std'的成员
  pre> 
 
 
  std :: stoul 等也会发生同样的情况。 std :: stoi 和家庭不存在于MinGW由于某些原因？我认为gcc on MinGW（sh | w）ould的行为与Linux上的一样。
解决方案
 - 在Windows上的 vswprintf 的标准声明GNU标准库在此平台上定义 _GLIBCXX_HAVE_BROKEN_VSWPRINTF ，从而禁用您尝试使用的转换函数。您可以在此处详细了解此问题和宏： http://gcc.gnu.org/bugzilla/show_bug .cgi？id = 37522 。
 
 
 
如果你愿意修改MinGW发布的头文件，你可以通过删除 ... / lib / gcc / mingw32 / 4.6.1 / include / c ++ / bits的第2754行上的！定义（_GLIBCXX_HAVE_BROKEN_VSWPRINTF） basic_string.h ，并将其添加回2905行到2965行（引用 std :: vswprintf 的行）。您将无法使用 std :: to_wstring 函数，但许多其他转换函数应该可用。
 
I tried compiling this simple program on IdeOne (which uses gcc 4.5.1) and on my Linux computer (which uses something like 4.6.4):
#include <string>
#include <iostream>

int main() {
     std::cout << std::stoi("32") << std::endl;
}
And it compiles perfectly and outputs 32. However, when I try to compile it on my windows computer with MinGW and gcc 4.6.1, I get this error:
test.cpp: In function 'int main()':
test.cpp:5:19: error: 'stoi' is not a member of 'std'
The same happens with std::stoul, etc. Does std::stoi and family not exist in MinGW for some reason? I thought gcc on MinGW (sh|w)ould behave the same as on Linux.
解决方案
This is a result of a non-standard declaration of vswprintf on Windows. The GNU Standard Library defines _GLIBCXX_HAVE_BROKEN_VSWPRINTF on this platform, which in turn disables the conversion functions you're attempting to use. You can read more about this issue and macro here: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37522.

If you're willing to modify the header files distributed with MinGW, you may be able to work around this by removing the !defined(_GLIBCXX_HAVE_BROKEN_VSWPRINTF) macro on line 2754 of .../lib/gcc/mingw32/4.6.1/include/c++/bits/basic_string.h, and adding it back around lines 2905 to 2965 (the lines that reference std::vswprintf). You won't be able to use the std::to_wstring functions, but many of the other conversion functions should be available.

                        
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