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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_PULL_COROUTINE_HPP
#define BOOST_COROUTINES2_DETAIL_PULL_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 pull_coroutine {
private:
template< typename X >
friend class push_coroutine;
struct control_block;
control_block * cb_;
explicit pull_coroutine( control_block *) noexcept;
bool has_result_() const noexcept;
public:
template< typename Fn,
typename = detail::disable_overload< pull_coroutine, Fn >
>
explicit pull_coroutine( Fn &&);
template< typename StackAllocator, typename Fn >
pull_coroutine( StackAllocator &&, Fn &&);
~pull_coroutine();
pull_coroutine( pull_coroutine const&) = delete;
pull_coroutine & operator=( pull_coroutine const&) = delete;
pull_coroutine( pull_coroutine &&) noexcept;
pull_coroutine & operator=( pull_coroutine && other) noexcept {
if ( this == & other) return * this;
std::swap( cb_, other.cb_);
return * this;
}
pull_coroutine & operator()();
explicit operator bool() const noexcept;
bool operator!() const noexcept;
T get() noexcept;
class iterator {
private:
pull_coroutine< T > * c_{ nullptr };
void fetch_() noexcept {
BOOST_ASSERT( nullptr != c_);
if ( ! ( * c_) ) {
c_ = nullptr;
return;
}
}
void increment_() {
BOOST_ASSERT( nullptr != c_);
BOOST_ASSERT( * c_);
( * c_)();
fetch_();
}
public:
typedef std::input_iterator_tag iterator_category;
typedef typename std::remove_reference< T >::type value_type;
typedef std::ptrdiff_t difference_type;
typedef value_type * pointer;
typedef value_type & reference;
typedef pointer pointer_t;
typedef reference reference_t;
iterator() noexcept = default;
explicit iterator( pull_coroutine< T > * c) noexcept :
c_{ c } {
fetch_();
}
iterator( iterator const& other) noexcept :
c_{ other.c_ } {
}
iterator & operator=( iterator const& other) noexcept {
if ( this == & other) return * this;
c_ = other.c_;
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++() {
increment_();
return * this;
}
iterator operator++( int) = delete;
reference_t operator*() const noexcept {
return c_->cb_->get();
}
pointer_t operator->() const noexcept {
return std::addressof( c_->cb_->get() );
}
};
friend class iterator;
};
template< typename T >
class pull_coroutine< T & > {
private:
template< typename X >
friend class push_coroutine;
struct control_block;
control_block * cb_;
explicit pull_coroutine( control_block *) noexcept;
bool has_result_() const noexcept;
public:
template< typename Fn,
typename = detail::disable_overload< pull_coroutine, Fn >
>
explicit pull_coroutine( Fn &&);
template< typename StackAllocator, typename Fn >
pull_coroutine( StackAllocator &&, Fn &&);
~pull_coroutine();
pull_coroutine( pull_coroutine const&) = delete;
pull_coroutine & operator=( pull_coroutine const&) = delete;
pull_coroutine( pull_coroutine &&) noexcept;
pull_coroutine & operator=( pull_coroutine && other) noexcept {
if ( this == & other) return * this;
std::swap( cb_, other.cb_);
return * this;
}
pull_coroutine & operator()();
explicit operator bool() const noexcept;
bool operator!() const noexcept;
T & get() noexcept;
class iterator {
private:
pull_coroutine< T & > * c_{ nullptr };
void fetch_() noexcept {
BOOST_ASSERT( nullptr != c_);
if ( ! ( * c_) ) {
c_ = nullptr;
return;
}
}
void increment_() {
BOOST_ASSERT( nullptr != c_);
BOOST_ASSERT( * c_);
( * c_)();
fetch_();
}
public:
typedef std::input_iterator_tag iterator_category;
typedef typename std::remove_reference< T >::type value_type;
typedef std::ptrdiff_t difference_type;
typedef value_type * pointer;
typedef value_type & reference;
typedef pointer pointer_t;
typedef reference reference_t;
iterator() noexcept = default;
explicit iterator( pull_coroutine< T & > * c) noexcept :
c_{ c } {
fetch_();
}
iterator( iterator const& other) noexcept :
c_{ other.c_ } {
}
iterator & operator=( iterator const& other) noexcept {
if ( this == & other) return * this;
c_ = other.c_;
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++() {
increment_();
return * this;
}
iterator operator++( int) = delete;
reference_t operator*() const noexcept {
return c_->cb_->get();
}
pointer_t operator->() const noexcept {
return std::addressof( c_->cb_->get() );
}
};
friend class iterator;
};
template<>
class pull_coroutine< void > {
private:
template< typename X >
friend class push_coroutine;
struct control_block;
control_block * cb_;
explicit pull_coroutine( control_block *) noexcept;
public:
template< typename Fn,
typename = detail::disable_overload< pull_coroutine, Fn >
>
explicit pull_coroutine( Fn &&);
template< typename StackAllocator, typename Fn >
pull_coroutine( StackAllocator &&, Fn &&);
~pull_coroutine();
pull_coroutine( pull_coroutine const&) = delete;
pull_coroutine & operator=( pull_coroutine const&) = delete;
pull_coroutine( pull_coroutine &&) noexcept;
pull_coroutine & operator=( pull_coroutine && other) noexcept {
if ( this == & other) return * this;
std::swap( cb_, other.cb_);
return * this;
}
pull_coroutine & operator()();
explicit operator bool() const noexcept;
bool operator!() const noexcept;
};
template< typename T >
typename pull_coroutine< T >::iterator
begin( pull_coroutine< T > & c) {
return typename pull_coroutine< T >::iterator( & c);
}
template< typename T >
typename pull_coroutine< T >::iterator
end( pull_coroutine< T > &) {
return typename pull_coroutine< T >::iterator();
}
}}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#endif // BOOST_COROUTINES2_DETAIL_PULL_COROUTINE_HPP
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