C++ std::stoi 在 MinGW 上的 g++ 4.6.1 中不存在
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std::stoi doesn't exist in g++ 4.6.1 on MinGW
提问by Seth Carnegie
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):
我尝试在 IdeOne（使用 gcc 4.5.1）和我的 Linux 计算机（使用类似 4.6.4 的东西）上编译这个简单的程序：
#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:
它可以完美编译并输出32. 但是，当我尝试使用 MinGW 和 gcc 4.6.1 在我的 Windows 计算机上编译它时，出现此错误：
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::stoiand family not exist in MinGW for some reason? I thought gcc on MinGW (sh|w)ould behave the same as on Linux.
std::stoul等也会发生同样的情况。std::stoi由于某种原因，MinGW 中不存在和家庭吗？我认为 MinGW (sh|w) 上的 gcc 的行为与 Linux 上的相同。
回答by DRH
This is a result of a non-standard declaration of vswprintfon Windows. The GNU Standard Library defines _GLIBCXX_HAVE_BROKEN_VSWPRINTFon 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.
这是vswprintfWindows 上非标准声明的结果。GNU 标准库_GLIBCXX_HAVE_BROKEN_VSWPRINTF在此平台上进行定义，从而禁用您尝试使用的转换函数。您可以在此处阅读有关此问题和宏的更多信息：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_wstringfunctions, but many of the other conversion functions should be available.
如果您愿意修改随 MinGW 分发的头文件，您可以通过删除 的!defined(_GLIBCXX_HAVE_BROKEN_VSWPRINTF)第 2754 行上的宏.../lib/gcc/mingw32/4.6.1/include/c++/bits/basic_string.h并将其添加回第 2905 至 2965 行（引用 的行std::vswprintf）来解决此问题。您将无法使用这些std::to_wstring函数，但许多其他转换函数应该可用。
回答by M.M
This is fixed in MinGW-w64, a fork of the original MinGW project that actually is interested in fixing bugs like this. It was fixed as of g++ 4.9.2, and maybe earlier.
这在MinGW-w64 中得到了修复，MinGW-w64是原始 MinGW 项目的一个分支，实际上有兴趣修复这样的错误。它从 g++ 4.9.2 开始修复，也许更早。
Note: for people coming here who have done a default install of CodeBlocks (which comes with the old, broken MinGW), and want to upgrade the compiler, see this answer.
注意：对于已经默认安装 CodeBlocks（旧的、损坏的 MinGW 随附）并希望升级编译器的人，请参阅此答案。
You can use any build of MinGW-w64: I use the self-installer from mingw-builds.org, whereas that answer uses TDM-GCC-64. If you want both 64bit and 32bit compilation you need to install and add 2 new compilers: mingw-w64 64-bit, and mingw-w64 32-bit. It does NOT support using one installation of g++ with the -m32or -m64switch to toggle.
您可以使用任何版本的 MinGW-w64：我使用来自 mingw-builds.org 的自安装程序，而该答案使用 TDM-GCC-64。如果您需要 64 位和 32 位编译，则需要安装并添加 2 个新编译器：mingw-w64 64 位和 mingw-w64 32 位。它不支持使用一个 g++ 安装与-m32或-m64开关切换。
回答by ashish
I am using MinGW 4.9.3-1. This problem seems to be still there. As a workaround, I used the another way of getting integers from strings.
我正在使用 MinGW 4.9.3-1。这个问题似乎仍然存在。作为一种解决方法，我使用了另一种从字符串中获取整数的方法。
int rows, columns;
sscanf(argv[1], "%d", &rows);
sscanf(argv[2], "%d", &columns);
回答by Sean Nolan
Use Mingw-w64. I had this same issue and using Mingw-w64 worked for me.
使用 Mingw-w64。我遇到了同样的问题，使用 Mingw-w64 对我有用。
