Function Pointers in C++ (Examples)

#include <iostream>

int add(int a, int b){
    return a + b;
}
int multiply(int a, int b){
    return a * b;
}
int main(){
	auto (*fp)(int, int);
    bool sel = 1;
    if(sel == 0){
        fp = add;
        std::cout << fp(1, 2) << std::endl;
    }else{
        fp = multiply;
        std::cout << fp(1, 2) << std::endl;
    }
    return 0;
}

#include <iostream>

// 定义回调函数类型
typedef void (*Callback)(int);

void process(int value, Callback cb) {
    std::cout << "Processing value: " << value << std::endl;
    cb(value); // 调用回调函数
}

void myCallback(int result) {
    std::cout << "Callback function called with result: " << result << std::endl;
}

int main() {
    // 使用回调函数
    process(42, myCallback);
    return 0;
}

std::function<int(int, int)> op;