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

std::wmemchr - cppreference.com

const wchar_t* wmemchr( const wchar_t* ptr, wchar_t ch, std::size_t count ); (1)       wchar_t* wmemchr(       wchar_t* ptr, wchar_t ch, std::size_t count ); (2)

Locates the first occurrence of wide character ch in the initial count wide characters of the wide character array pointed to by ptr.

If count is zero, the function returns a null pointer.

[edit] Parameters ptr - pointer to the wide character array to be examined ch - wide character to search for count - number of wide characters to examine [edit] Return value

Pointer to the location of the wide character, or a null pointer if no such character is found.

[edit] Example 
#include <clocale>
#include <cwchar>
#include <iostream>
#include <locale>
 
int main()
{
    const wchar_t str[] = L"诺不轻信，故人不负我\0诺不轻许，故我不负人。";
    wchar_t target = L'许';
    const std::size_t sz = sizeof str / sizeof *str;
    if (const wchar_t* result = std::wmemchr(str, target, sz))
    {
        std::setlocale(LC_ALL, "en_US.utf8");
        std::wcout.imbue(std::locale("en_US.utf8"));
        std::wcout << "Found '" << target << "' at position " << result - str << '\n';
    }
}

Possible output:

Found '许' at position 14
[edit] See also

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