libsigc++: sigc::functor_trait< T_functor, I_derives_functor_base, I_can_use_decltype > Struct Template Reference

libsigc++ 2.10.6

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sigc::functor_trait< T_functor, I_derives_functor_base, I_can_use_decltype > Struct Template Reference
Functors

Trait that specifies the return type of any type. More...

`#include <sigc++/functors/functor_trait.h>`

## Public Types
typedef T_functor | functor_type
typedef void | result_type

## Detailed Description

### template<class T_functor, bool I_derives_functor_base = std::is_base_of<functor_base,T_functor>::value, bool I_can_use_decltype = can_deduce_result_type_with_decltype<T_functor>::value>
struct sigc::functor_trait< T_functor, I_derives_functor_base, I_can_use_decltype >

Trait that specifies the return type of any type.

Template specializations for functors derived from sigc::functor_base, for other functors whose result type can be deduced with decltype(), for function pointers and for class methods are provided.

Template Parameters

  T_functor | Functor type.
  I_derives_functor_base | Whether `T_functor` inherits from sigc::functor_base.
  I_can_use_decltype | Whether the result type of `T_functor` can be deduced with decltype().

## Member Typedef Documentation

## ◆ functor_type

template <class T_functor , bool I_derives_functor_base = std::is_base_of<functor_base,T_functor>::value, bool I_can_use_decltype = can_deduce_result_type_with_decltype<T_functor>::value>

typedef T_functor sigc::functor_trait< T_functor, I_derives_functor_base, I_can_use_decltype >::functor_type

## ◆ result_type

template <class T_functor , bool I_derives_functor_base = std::is_base_of<functor_base,T_functor>::value, bool I_can_use_decltype = can_deduce_result_type_with_decltype<T_functor>::value>

typedef void sigc::functor_trait< T_functor, I_derives_functor_base, I_can_use_decltype >::result_type