C++ Insights

Source:

#include <iostream>
#include <tuple>

using namespace std;

class Foo
{
public:
    Foo() {
        cout << "   constructor of " << this << endl;
    };
    
    ~Foo() {
        cout << "   destructor of " << this << endl;
    };

Foo(const Foo&) = delete;
	Foo& operator=(const Foo&) = delete;

Foo(Foo&& other) {
	    cout << "   move constructor from " << &other << " to " << this << endl; 
	};
	
	Foo& operator=(Foo&& other) {
	    cout << "   move assignment from " << &other << " to " << this << endl;
	    return *this;
	};
	
	void doSomething()
	{
	    cout << "   do something" << endl;
	}
};

Foo Bar1()
{
    Foo tmp;
    tmp.doSomething();
    return tmp;
}

tuple<Foo, void*> Bar2()
{
    Foo tmp;
    tmp.doSomething();
    return make_tuple<Foo, void*>(move(tmp), nullptr);
}

int main()
{
    Foo f1;
    
    cout << "Experiment #1:" << endl;
    f1 = Bar1();
    
    cout << "Experiment #2:" << endl;
    tie(f1, ignore) = Bar2();
    
    cout << "Finished" << endl;
    return 0;
}

Source:

Insight:

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