#include <iostream>

#include <vector>

#include <initializer_list>

struct X {

X() { std::cout << "X()" << std::endl; }

X(const X&) { std::cout << "X(const X&)" << std::endl; }

X& operator=(const X&) { std::cout << "X& operator=(const X&)" << std::endl; return *this; }

~X() { std::cout << "~X()" << std::endl; }

};

void f(const X &rx, X x)

{

std::cout << "code: std::vector<X> vec;" << std::endl;

std::vector<X> vec;

std::cout << "code: vec.reserve(2);" << std::endl;

vec.reserve(2);

std::cout << "code: vec.push_back(rx);" << std::endl;

vec.push_back(rx);

std::cout << "code: vec.push_back(x);" << std::endl;

vec.push_back(x);

}

int main()

{

std::cout << "code: X *px = new X;" << std::endl;

X *px = new X;

std::cout << "code: f(*px, *px);" << std::endl;

f(*px, *px);

std::cout << "code: delete px;" << std::endl;

delete px;

return 0;

}