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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.

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] Example

Run this code

    #include <iostream>
    #include <cwchar>
    #include <clocale>

    int main()
    {
        const wchar_t* str = L"爆ぜろリアル！弾けろシナプス！パニッシュメントディス、ワールド！";

        std::setlocale(LC_ALL, "en_US.utf8");
        std::wcout.imbue(std::locale("en_US.utf8"));
        std::wcout << "The length of \"" << str << "\" is " << std::wcslen(str) << '\n';
    }

Output:

    The length of "爆ぜろリアル！弾けろシナプス！パニッシュメントディス、ワールド！" is 32

### [edit] See also

strlen | returns the length of a given string (function) [edit]
mblen | returns the number of bytes in the next multibyte character (function) [edit]
C documentation for wcslen

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