g++ Locale ?? correction

[Papa]

COLLECT_GCC=C:\gnu\mingw-w64\mingw64\bin\g++.exe
COLLECT_LTO_WRAPPER=C:/gnu/mingw-w64/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/6.3.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
OS: Win 8.1
class myClass{
    private:
     std::locale current_locale;
    public:
     void setGlobalLocale(const std::string& str) {
         current_locale.global(std::locale(str.data())); 
//<<Segmentation fault>>
     }
};


On 01-May-2017 11:57 PM, Papa wrote:
> COLLECT_GCC=C:\gnu\mingw-w64\mingw64\bin\g++.exe
> COLLECT_LTO_WRAPPER=C:/gnu/mingw-w64/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/6.3.0/lto-wrapper.exe 
>
> Target: x86_64-w64-mingw32
> OS: Win 8.1
> class{
>    private:
>     std::locale current_locale;
>    public:
>     void setGlobalLocale(const std::string& str) {
>         current_locale.global(std::locale(str)); //<< RunTimeError>>
>     }
> };
>
> I'm writing a wrapper for std::locale, but right at start-up the first 
> problem.
> Why would this member function give me a Run Time Error?
>
> Any help is much appreciated.
>

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