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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../string/wide/wcscspn.html below:

std::wcscspn - cppreference.com

std::size_t wcscspn( const wchar_t* dest, const wchar_t* src );

Returns the length of the maximum initial segment of the wide string pointed to by dest, that consists of only the characters not found in wide string pointed to by src.

[edit] Parameters dest - pointer to the null-terminated wide string to be analyzed src - pointer to the null-terminated wide string that contains the characters to search for [edit] Return value

The length of the maximum initial segment that contains only characters not found in the character string pointed to by src.

[edit] Example

The output below was obtained using clang (libc++).

#include <cwchar>
#include <iostream>
#include <locale>
 
int main()
{
    wchar_t dest[] = L"白猫 黑狗 甲虫";
    //                      └───┐
    const wchar_t* src = L"甲虫,黑狗";
 
    const std::size_t len = std::wcscspn(dest, src);
    dest[len] = L'\0'; // terminates the segment to print it out
 
    std::wcout.imbue(std::locale("en_US.utf8"));
    std::wcout << L"The length of maximum initial segment is " << len << L".\n";
    std::wcout << L"The segment is \"" << dest << L"\".\n";
}

Possible output:

The length of maximum initial segment is 3.
The segment is "白猫 ".
[edit] See also returns the length of the maximum initial segment that consists
of only the wide characters found in another wide string
(function) [edit] finds the first location of any wide character in one wide string, in another wide string
(function) [edit]

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