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