Question

What is the correct C++ way of comparing a memory buffer with a constant string – strcmp(buf, "sometext") ? I want to avoid unnecessary memory copying as the result of creating temporary std::string objects.

Thanks.

Answer 1

If you’re just checking for equality, you may be able to use std::equal

#include <algorithms>

const char* text = "sometext";
const int len = 8; // length of text

if (std::equal(text, text+len, buf)) ...

of course this will need additional logic if your buffer can be smaller than the text