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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 ob- ject 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 <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 != 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) http://cppreference.com 2022.07.31 std::memchr(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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