Use std::move to abandon ownership

unique_ptr_1.cpp

#include <memory>

class A
{
public:
    A( std::unique_ptr< int > v ) : m_v( std::move(v) ) {}

    std::unique_ptr< int > m_v;
};

int main( int argc, char** argv )
{
    std::unique_ptr< int > i( new int(10) );
    A a( std::move(i) );
}