std::memchr

const void* memchr( const void* ptr, int ch, std::size_t count );

      void* memchr(       void* ptr, int ch, std::size_t count );

Converts ch to unsigned char and locates the first occurrence of that value in the initial count bytes (each interpreted as unsigned char) of the object pointed to by ptr.

Parameters

Return value

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

Example

Search an array of characters.

#include <cstring>
#include <iostream>
 
int main()
{
    char arr[] = {'a', '\0', 'a', 'A', 'a', 'a', 'A', 'a'};
    char *pc = (char*) std::memchr(arr, 'A', sizeof arr);
    if (pc != nullptr)
        std::cout << "search character found\n";
    else
        std::cout << "search character not found\n";
}

search character found

See also