diff options
Diffstat (limited to 'boost/poly_collection/detail/callable_wrapper_iterator.hpp')
-rw-r--r-- | boost/poly_collection/detail/callable_wrapper_iterator.hpp | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/boost/poly_collection/detail/callable_wrapper_iterator.hpp b/boost/poly_collection/detail/callable_wrapper_iterator.hpp new file mode 100644 index 0000000000..fb3ca2338d --- /dev/null +++ b/boost/poly_collection/detail/callable_wrapper_iterator.hpp @@ -0,0 +1,95 @@ +/* Copyright 2016 Joaquin M Lopez Munoz. + * Distributed under the Boost Software License, Version 1.0. + * (See accompanying file LICENSE_1_0.txt or copy at + * http://www.boost.org/LICENSE_1_0.txt) + * + * See http://www.boost.org/libs/poly_collection for library home page. + */ + +#ifndef BOOST_POLY_COLLECTION_DETAIL_CALLABLE_WRAPPER_ITERATOR_HPP +#define BOOST_POLY_COLLECTION_DETAIL_CALLABLE_WRAPPER_ITERATOR_HPP + +#if defined(_MSC_VER) +#pragma once +#endif + +#include <boost/iterator/iterator_adaptor.hpp> +#include <type_traits> + +namespace boost{ + +namespace poly_collection{ + +namespace detail{ + +/* callable_wrapper<Sig>* adaptor convertible to pointer to wrapped entity */ + +template<typename CWrapper> +class callable_wrapper_iterator:public boost::iterator_adaptor< + callable_wrapper_iterator<CWrapper>,CWrapper* +> +{ +public: + callable_wrapper_iterator()=default; + explicit callable_wrapper_iterator(CWrapper* p)noexcept: + callable_wrapper_iterator::iterator_adaptor_{p}{} + callable_wrapper_iterator(const callable_wrapper_iterator&)=default; + callable_wrapper_iterator& operator=( + const callable_wrapper_iterator&)=default; + + template< + typename NonConstCWrapper, + typename std::enable_if< + std::is_same<CWrapper,const NonConstCWrapper>::value>::type* =nullptr + > + callable_wrapper_iterator( + const callable_wrapper_iterator<NonConstCWrapper>& x)noexcept: + callable_wrapper_iterator::iterator_adaptor_{x.base()}{} + + template< + typename NonConstCWrapper, + typename std::enable_if< + std::is_same<CWrapper,const NonConstCWrapper>::value>::type* =nullptr + > + callable_wrapper_iterator& operator=( + const callable_wrapper_iterator<NonConstCWrapper>& x)noexcept + { + this->base_reference()=x.base(); + return *this; + } + + /* interoperability with CWrapper* */ + + callable_wrapper_iterator& operator=(CWrapper* p)noexcept + {this->base_reference()=p;return *this;} + operator CWrapper*()const noexcept{return this->base();} + + /* interoperability with Callable* */ + + template< + typename Callable, + typename std::enable_if< + std::is_constructible<CWrapper,Callable&>::value&& + (!std::is_const<CWrapper>::value||std::is_const<Callable>::value) + >::type* =nullptr + > + explicit operator Callable*()const noexcept + { + return const_cast<Callable*>( + static_cast<const Callable*>( + const_cast<const void*>( + this->base()->data()))); + } + +private: + template<typename> + friend class callable_wrapper_iterator; +}; + +} /* namespace poly_collection::detail */ + +} /* namespace poly_collection */ + +} /* namespace boost */ + +#endif |