From cppreference.com
std::size_twcslen(constwchar_t*str);Returns the length of a wide string, that is the number of non-null wide characters that precede the terminating null wide character.
The behavior is undefined if there is no null character in the wide character array pointed to by str.
Parameters
str - pointer to the null-terminated wide string to be examined Return value
The length of the null-terminated wide string str.
Possible implementation
std::size_twcslen(constwchar_t*start){// NB: start is not checked for nullptr!constwchar_t*end=start;while(*end!=L'\0')++end;returnend-start;}Example
Run this code
#include<iostream>#include<cwchar>intmain(){constwchar_t*str=L"Hello, world!";std::wcout<<"The length of L\""<<str<<"\" is "<<std::wcslen(str)<<'\n';}Output:
The length of L"Hello, world!" is 13 See also