关于C++中各种返回值的形式和右值引用结合

rvalue.cpp

#include <iostream>
using namespace std;

void swap(int* a,int& b){
	int t = *a;
	*a = b;
	b = t;
}
void swap(int& a,int& b){
	int t = move(a);
	a = move(b);
	b = move(t);
}
int& add(int a,int b,int& result){
	result = a + b;
	return result;
}
int add(int a,int b){
	int result = a + b;
	return move(result);
}
int& add(int a,int* result){
	*result += a;
	return *result;
}

//const int& add(int a,int* result){
//	*result += a;
//	return *result;
//}
int main(){
	int a = 3,b = 4;
	int result_1 = 0;
	
	int result_2 = 0;
        result_2 = add(a,b);
	cout << result_2 << endl;
	
	add(a,b,result_1);
	cout << result_1 << endl;

	add(3,&result_1)++;
	cout << result_1 << endl;

	swap(a,b);
	cout << a << "," << b << endl;
	return 0;
}