为什么在C++中使用关系运算符创建的模板函数对字符串不能正常工作？

#include <iostream>
#include <cstring> // 包含strcmp()函数的头文件
#include <string> // 包含std::string类的头文件

template<typename T>
bool isEqual(T a, T b) {
    return a == b;
}

int main() {
    const char* str1 = "Hello";
    const char* str2 = "World";

    // 使用strcmp()函数比较字符串
    if (isEqual(strcmp(str1, str2), 0)) {
        std::cout << "str1 and str2 are equal." << std::endl;
    } else {
        std::cout << "str1 and str2 are not equal." << std::endl;
    }

    // 使用std::string类比较字符串
    std::string s1 = "Hello";
    std::string s2 = "World";

    if (isEqual(s1, s2)) {
        std::cout << "s1 and s2 are equal." << std::endl;
    } else {
        std::cout << "s1 and s2 are not equal." << std::endl;
    }

    return 0;
}