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 //          Copyright Oliver Kowalke 2014.
 // 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)
 
 #ifndef BOOST_COROUTINES2_DETAIL_PUSH_COROUTINE_HPP
 #define BOOST_COROUTINES2_DETAIL_PUSH_COROUTINE_HPP
 
 #include <iterator>
 #include <type_traits>
 
 #include <boost/assert.hpp>
 #include <boost/config.hpp>
 
 #include <boost/coroutine2/detail/config.hpp>
 #include <boost/coroutine2/detail/disable_overload.hpp>
 
 #ifdef BOOST_HAS_ABI_HEADERS
 #  include BOOST_ABI_PREFIX
 #endif
 
 namespace boost {
 namespace coroutines2 {
 namespace detail {
 
 template< typename T >
 class push_coroutine {
 private:
     template< typename X >
     friend class pull_coroutine;
 
     struct control_block;
 
     control_block   *   cb_;
 
     explicit push_coroutine( control_block *) noexcept;
 
 public:
     template< typename Fn,
               typename = detail::disable_overload< push_coroutine, Fn >
     >
     explicit push_coroutine( Fn &&);
 
     template< typename StackAllocator, typename Fn >
     push_coroutine( StackAllocator &&, Fn &&);
 
     ~push_coroutine();
 
     push_coroutine( push_coroutine const&) = delete;
     push_coroutine & operator=( push_coroutine const&) = delete;
 
     push_coroutine( push_coroutine &&) noexcept;
 
     push_coroutine & operator=( push_coroutine && other) noexcept {
         if ( this == & other) return * this;
         std::swap( cb_, other.cb_);
         return * this;
     }
 
     push_coroutine & operator()( T const&);
 
     push_coroutine & operator()( T &&);
 
     explicit operator bool() const noexcept;
 
     bool operator!() const noexcept;
 
     class iterator {
     private:
         push_coroutine< T > *   c_{ nullptr };
 
     public:
         typedef std::output_iterator_tag iterator_category;
         typedef void value_type;
         typedef void difference_type;
         typedef void pointer;
         typedef void reference;
 
         iterator() noexcept = default;
 
         explicit iterator( push_coroutine< T > * c) noexcept :
             c_{ c } {
         }
 
         iterator & operator=( T t) {
             BOOST_ASSERT( nullptr != c_);
             if ( ! ( * c_)( t) ) {
                 c_ = nullptr;
             }
             return * this;
         }
 
         bool operator==( iterator const& other) const noexcept {
             return other.c_ == c_;
         }
 
         bool operator!=( iterator const& other) const noexcept {
             return other.c_ != c_;
         }
 
         iterator & operator*() noexcept {
             return * this;
         }
 
         iterator & operator++() noexcept {
             return * this;
         }
     };
 };
 
 template< typename T >
 class push_coroutine< T & > {
 private:
     template< typename X >
     friend class pull_coroutine;
 
     struct control_block;
 
     control_block   *   cb_;
 
     explicit push_coroutine( control_block *) noexcept;
 
 public:
     template< typename Fn,
               typename = detail::disable_overload< push_coroutine, Fn >
     >
     explicit push_coroutine( Fn &&);
 
     template< typename StackAllocator, typename Fn >
     push_coroutine( StackAllocator &&, Fn &&);
 
     ~push_coroutine();
 
     push_coroutine( push_coroutine const&) = delete;
     push_coroutine & operator=( push_coroutine const&) = delete;
 
     push_coroutine( push_coroutine &&) noexcept;
 
     push_coroutine & operator=( push_coroutine && other) noexcept {
         if ( this == & other) return * this;
         std::swap( cb_, other.cb_);
         return * this;
     }
 
     push_coroutine & operator()( T &);
 
     explicit operator bool() const noexcept;
 
     bool operator!() const noexcept;
 
     class iterator {
     private:
         push_coroutine< T & >   *   c_{ nullptr };
 
     public:
         typedef std::output_iterator_tag iterator_category;
         typedef void value_type;
         typedef void difference_type;
         typedef void pointer;
         typedef void reference;
 
         iterator() noexcept = default;
 
         explicit iterator( push_coroutine< T & > * c) noexcept :
             c_{ c } {
         }
 
         iterator & operator=( T & t) {
             BOOST_ASSERT( nullptr != c_);
             if ( ! ( * c_)( t) ) {
                 c_ = nullptr;
             }
             return * this;
         }
 
         bool operator==( iterator const& other) const noexcept {
             return other.c_ == c_;
         }
 
         bool operator!=( iterator const& other) const noexcept {
             return other.c_ != c_;
         }
 
         iterator & operator*() noexcept {
             return * this;
         }
 
         iterator & operator++() noexcept {
             return * this;
         }
     };
 };
 
 template<>
 class push_coroutine< void > {
 private:
     template< typename X >
     friend class pull_coroutine;
 
     struct control_block;
 
     control_block   *   cb_;
 
     explicit push_coroutine( control_block *) noexcept;
 
 public:
     template< typename Fn,
               typename = detail::disable_overload< push_coroutine, Fn >
     >
     explicit push_coroutine( Fn &&);
 
     template< typename StackAllocator, typename Fn >
     push_coroutine( StackAllocator &&, Fn &&);
 
     ~push_coroutine();
 
     push_coroutine( push_coroutine const&) = delete;
     push_coroutine & operator=( push_coroutine const&) = delete;
 
     push_coroutine( push_coroutine &&) noexcept;
 
     push_coroutine & operator=( push_coroutine && other) noexcept {
         if ( this == & other) return * this;
         std::swap( cb_, other.cb_);
         return * this;
     }
 
     push_coroutine & operator()();
 
     explicit operator bool() const noexcept;
 
     bool operator!() const noexcept;
 };
 
 template< typename T >
 typename push_coroutine< T >::iterator
 begin( push_coroutine< T > & c) {
     return typename push_coroutine< T >::iterator( & c);
 }
 
 template< typename T >
 typename push_coroutine< T >::iterator
 end( push_coroutine< T > &) {
     return typename push_coroutine< T >::iterator();
 }
 
 }}}
 
 #ifdef BOOST_HAS_ABI_HEADERS
 #  include BOOST_ABI_SUFFIX
 #endif
 
 #endif // BOOST_COROUTINES2_DETAIL_PUSH_COROUTINE_HPP

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