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namespace boost { class in_place_init_t { /* see below */ } ; const in_place_init_t in_place_init ( /* see below */ ) ; class in_place_init_if_t { /*see below*/ } ; const in_place_init_if_t in_place_init_if ( /*see below*/ ) ; }
          Classes in_place_init_t
          and in_place_init_if_t
          are empty clsses. Their purpose is to control overload resolution in the
          initialization of optional objects. They are empty, trivially copyable
          classes with disabled default constructor.