std::setlocale(...) return value ??

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According to the C++ Reference setlocale(...) returns a 'char*', however, when trying to assign this function's return value to another 'char*', it creates an run time error.
Here is my example:

<snip>
void jme::Locale::setGlobalLocale(const std::string& str){
     char* arg = new char[str.length()+1];
     strcpy(arg, str.c_str()); // const char* to char* -- Works
     char* cp = new char[1024];
strcpy(cp, std::setlocale(LC_ALL, arg)); // char* to char* -- Does not work ??

    delete arg;
    delete cp;
}
</snip>
The code compiles, but as I said before it does not run.

What am I missing? How can I solve this problem?


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