Method construct

3rdParty/boost/boost/optional/optional.hpp:407–411

  protected :

    void construct ( argument_type val )
     {
       ::new (m_storage.address()) unqualified_value_type(val) ;
       m_initialized = true ;
     }

#ifndef  BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
    void construct ( rval_reference_type val )