std::memchr(3) C++ Standard Libary std::memchr(3) NAME std::memchr - std::memchr Synopsis 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 bytes (each interpreted as unsigned char) of the object pointed to by ptr. This function behaves as if it reads the bytes sequentially and stops as soon as a matching bytes is found: if the array pointed to by ptr (since C++17) is smaller than count, but the match is found within the array, the behavior is well-defined. Parameters ptr - pointer to the object to be examined ch - byte to search for count - max number of bytes to examine 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. // Run this code #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"; } Output: search character found See also strchr finds the first occurrence of a character (function) find find_if finds the first element satisfying specific criteria find_if_not (function template) (C++11) C documentation for memchr http://cppreference.com 2024.06.10 std::memchr(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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