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# std::wcslen

From cppreference.com
< cpp‎ | string‎ | wide

Defined in header `<cwchar>` |  |
std::size_t wcslen( const wchar_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.

### [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] 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

### [edit] See also

C documentation for wcslen

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