Method pop

extern/libcds/test/stress/stack/stack_type.h:98–107

            }

            bool pop( T& v )
            {
                unique_lock l( m_Lock );
                if ( !m_Impl.empty()) {
                    v = m_Impl.top();
                    m_Impl.pop();
                    return true;
                }
                return false;
            }

            bool empty() const
            {