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#### Initialization tags

    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.