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Struct template concept_interface

boost::type_erasure::concept_interface

Synopsis

// In header: <boost/type_erasure/concept_interface.hpp>

template<typename Concept, typename Base, typename ID, typename Enable = void> 
struct concept_interface : public Base {
};

Description

The concept_interface class can be specialized to add behavior to an any. An any inherits from all the relevant specializations of concept_interface.

concept_interface can be specialized for either primitive or composite concepts. If a concept C1 contains another concept C2, then the library guarantees that the specialization of concept_interface for C2 is a base class of the specialization for C1. This means that C1 can safely override members of C2.

concept_interface may only be specialized for user-defined concepts. The library owns the specializations of its own built in concepts.

The metafunctions derived, rebind_any, and as_param (which can be applied to Base) are useful for determining the argument and return types of functions defined in concept_interface.

For dispatching the function use call.

Template Parameters

  1. typename Concept

    The concept that we're specializing concept_interface for. One of its placeholders should be ID.

  2. typename Base

    The base of this class. Specializations of concept_interface must inherit publicly from this type.

  3. typename ID

    The placeholder representing this type.

  4. typename Enable = void

    A dummy parameter that can be used for SFINAE.


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