C++如何使用模板为整型、双精度、字符串等编写泛型比较器函数

#include <iostream>
#include <string>

// 泛型比较器函数模板
template <typename T>
int compare(T a, T b) {
    if (a < b) {
        return -1;
    } else if (a > b) {
        return 1;
    } else {
        return 0;
    }
}

int main() {
    int intA = 10, intB = 20;
    double doubleA = 3.14, doubleB = 2.71;
    std::string stringA = "Hello", stringB = "World";

    // 使用泛型比较器函数进行比较
    std::cout << "int comparison result: " << compare(intA, intB) << std::endl;
    std::cout << "double comparison result: " << compare(doubleA, doubleB) << std::endl;
    std::cout << "string comparison result: " << compare(stringA, stringB) << std::endl;

    return 0;
}