在C++中使用模板和切换大小写的多种返回类型

#include <iostream>
#include <string>

// 模板函数，根据不同类型返回不同的数据
template<typename T>
T getData(T value) {
    return value;
}

// 切换字符串的大小写
std::string toggleCase(std::string str) {
    for (char& c : str) {
        if (std::islower(c)) {
            c = std::toupper(c);
        } else if (std::isupper(c)) {
            c = std::tolower(c);
        }
    }
    return str;
}

int main() {
    int intValue = getData<int>(10);
    std::cout << "Int value: " << intValue << std::endl;

    double doubleValue = getData<double>(3.14);
    std::cout << "Double value: " << doubleValue << std::endl;

    std::string stringValue = getData<std::string>("Hello");
    std::cout << "String value: " << stringValue << std::endl;

    std::string str = "Hello World";
    std::cout << "Original string: " << str << std::endl;
    std::cout << "Toggled case string: " << toggleCase(str) << std::endl;

    return 0;
}

Int value: 10
Double value: 3.14
String value: Hello
Original string: Hello World
Toggled case string: hELLO wORLD