#include <iostream>
#include <utility>
#include <vector>
 
int i = 0;
struct A
{
    A() : j( ++i )
    {
        std::cout<<"constructor "<<j<<std::endl;
    }
    A( const A & c) : j(c.j)
    {
        std::cout<<"copy "<<j<<std::endl;
    }
    A( const A && c) : j(c.j)
    {
        std::cout<<"move "<<j<<std::endl;
    }
    ~A()
    {
        std::cout<<"destructor "<<j<<std::endl;
    }
 
    int j;
};
 
typedef std::vector< A > vec;
 
void foo( vec & v )
{
    v.push_back( std::move( A() ) );
}
 
int main()
{
    vec v;
    v.reserve(2);
 
    foo( v );
    foo( v );
}

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