std::wcslen
From cppreference.com
| Defined in header <cwchar>
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std::size_t wcslen( const wchar_t* str );
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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_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;
}
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Example
Run this code
#include <iostream>
#include <cwchar>
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
See also
| returns the length of a given string (function) | |
| returns the number of bytes in the next multibyte character (function) | |
C documentation for wcslen
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