libsigc++
2.3.1
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Base type for adaptors. More...
#include <sigc++/adaptors/adaptor_trait.h>
Public Types | |
typedef adaptor_trait < T_functor >::result_type | result_type |
typedef adaptor_trait < T_functor >::adaptor_type | adaptor_type |
Public Member Functions | |
adapts (const T_functor& _A_functor) | |
Constructs an adaptor that wraps the passed functor. | |
Public Attributes | |
adaptor_type | functor_ |
Adaptor that is invoked from operator()(). | |
Base type for adaptors.
adapts wraps adaptors, functors, function pointers and class methods. It contains a single member functor which is always a sigc::adaptor_base. The typedef adaptor_type defines the exact type that is used to store the adaptor, functor, function pointer or class method passed into the constructor. It differs from T_functor unless T_functor inherits from sigc::adaptor_base.
If you implement your own adaptor, you must also provide your specialization of visit_each<>() that will forward the call to the functor(s) your adapter is wrapping. Otherwise, pointers stored within the functor won't be invalidated when a sigc::trackable object is destroyed and you can end up executing callbacks on destroyed objects.
Your adaptor and your specialization of visit_each<>() must be in the same namespace.
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inlineexplicit |
Constructs an adaptor that wraps the passed functor.
_A_functor | Functor to invoke from operator()(). |