Defined in header <cstring> | ||
|---|---|---|
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 characters (each interpreted as unsigned char) of the object pointed to by ptr.
| This function behaves as if it reads the characters sequentially and stops as soon as a matching character is found: if the array pointed to by | (since C++17) |
| ptr | - | pointer to the object to be examined |
| ch | - | character to search for |
| count | - | max number of characters to examine |
Pointer to the location of the character, or NULL if no such character is found.
Search an array of characters.
#include <iostream>
#include <cstring>
int main()
{
char arr[] = {'a','\0','a','A','a','a','A','a'};
char *pc = (char*)std::memchr(arr,'A',sizeof arr);
if (pc != NULL)
std::cout << "search character found\n";
else
std::cout << "search character not found\n";
}Output:
search character found
| finds the first occurrence of a character (function) |
|
|
(C++11) | finds the first element satisfying specific criteria (function template) |
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