std::wcslen - cppreference.com (original) (raw)
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.
[edit] Parameters
| str | - | pointer to the null-terminated wide string to be examined |
|---|
[edit] Return value
The length of the null-terminated wide string str.
[edit] Possible implementation
std::size_t wcslen(const wchar_t* start) { // NB: start is not checked for nullptr! const wchar_t* end = start; while (*end != L'\0') ++end; return end - start; }
[edit] Example
#include #include int main() { const wchar_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