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

std::wcsspn - cppreference.com

size_t wcsspn( 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 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 from wide string pointed to by src.

[edit] Example

#include <cwchar>
#include <iostream>
#include <locale>
 
int main()
{
    wchar_t dest[] = L"ç½ç« é»ç ç²è«";
    const wchar_t src[] = L" çç« ç½é» ";
    const std::size_t len = std::wcsspn(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 6.
The segment is "ç½ç« é»ç ".

[edit] See also returns the length of the maximum initial segment that consists
of only the wide not 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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