I want to convert std::string into a const wchar_t *

::std::string str;
BOOL loadU(const wchar_t* lpszPathName, int flag = 0);

loadU(&str);

std::wstring name( L"Steve Nash" );
wchar_t* szName = name.c_str();

#include <atlconv.h>
...
std::string str = "Hello, world!";
CA2W pszWide(str.c_str());
loadU(pszWide);

CA2W pszWide(str.c_str(), CP_UTF8);

std::wstring widestr = std::wstring(str.begin(), str.end());

wchar_t* widecstr = widestr.c_str();