No matching function transform?

http://stackoverflow.com/questions/19876746/stdtolower-and-visual-studio-2013

Http://forums.codeguru.com/showthread.php?489969-no-matching-function-transform

std::toloweris overloaded in C + +, it ' s declared in as <cctype>

int tolower(int);

And also in as <locale>

template<CharT> CharT tolower(CharT, const locale&);

So when you say " std::tolower " you get a ambiguous(blurry) reference to an overloaded function.

1. Why ::tolower version is working?

When you include the <cctype> one-argument overload are declared in namespace std and mightalso are declared in the Global namespace, depending on the compiler. If you include then <ctype.h> it's guaranteed to being included in the global namespace, and would work ::tolower (although note Dietm Ar ' s points about when it's not safe. The two-argument overload from <locale> are never declared in the global namespace, so ::tolower never refers to the two-argument Overload.

2. Why isn't std::tolower working in Std::transform?

See above, it's an overloaded name.

No matching function transform?