C++中不区分大小写的字符串比较

#include<iostream>
#include<string>
#include<algorithm>

bool compare_ignore_case(char a, char b) {
    return std::tolower(a) == std::tolower(b);
}

int main() {
    std::string s1 = "Hello, World!";
    std::string s2 = "hello, world!";

    if (std::equal(s1.begin(), s1.end(), s2.begin(), compare_ignore_case)) {
        std::cout << "Strings are equal (ignoring case)"<< std::endl;
    } else {
        std::cout << "Strings are not equal (ignoring case)"<< std::endl;
    }

    return 0;
}