Why is \'stoi\' not a member of \'std\' when compiling with MinGW 4.6.1?

std::stoi Issue in MinGW 4.6.1

The error "error: 'stoi' is not a member of 'std'" while compiling with MinGW 4.6.1 stems from a non-standard declaration of vswprintf on Windows.

Explanation:

The GNU Standard Library defines the macro _GLIBCXX_HAVE_BROKEN_VSWPRINTF on this platform. This macro disables certain conversion functions, including std::stoi.

Workaround:

To work around this issue, consider modifying the header files distributed with MinGW:

1. Remove the !defined(_GLIBCXX_HAVE_BROKEN_VSWPRINTF) macro on line 2754 of .../lib/gcc/mingw32/4.6.1/include/c /bits/basic_string.h.
2. Re-add the macro around lines 2905 to 2965, which reference std::vswprintf.

Consequences:

This workaround disables std::to_wstring functions but allows other conversion functions to be available.

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