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Public Types | |
| typedef functor_trait< T_functor >::result_type | type |
typename deduce_result_type<functor_type, list of arg_types>::type deduces a functor's result type if functor_type inherits from sigc::functor_base and defines result_type or if functor_type is actually a (member) function type. Multi-type functors are not supported.
sigc++ adaptors use typename deduce_result_type<functor_type, list of arg_types>::type to determine the return type of their templated operator() overloads.
Adaptors in turn define a nested template class deduce_result_type that is used by template specializations of the global deduce_result_type template to correctly deduce the return types of the adaptor's suitable template operator() overload.
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