FM / detail

/usr/include/boost/coroutine/detail

Name	Size	Mode	Actions
config.hpp	1238	0644	edit dl rm
coroutine_context.hpp	2107	0644	edit dl rm
data.hpp	703	0644	edit dl rm
flags.hpp	879	0644	edit dl rm
parameters.hpp	2310	0644	edit dl rm
preallocated.hpp	1036	0644	edit dl rm
pull_coroutine_impl.hpp	8798	0644	edit dl rm
pull_coroutine_object.hpp	10060	0644	edit dl rm
pull_coroutine_synthesized.hpp	2201	0644	edit dl rm
push_coroutine_impl.hpp	7740	0644	edit dl rm
push_coroutine_object.hpp	10413	0644	edit dl rm
push_coroutine_synthesized.hpp	2097	0644	edit dl rm
setup.hpp	1885	0644	edit dl rm
symmetric_coroutine_call.hpp	32530	0644	edit dl rm
symmetric_coroutine_impl.hpp	12485	0644	edit dl rm
symmetric_coroutine_object.hpp	7947	0644	edit dl rm
symmetric_coroutine_yield.hpp	8462	0644	edit dl rm
trampoline.hpp	1699	0644	edit dl rm
trampoline_pull.hpp	1224	0644	edit dl rm
trampoline_push.hpp	2066	0644	edit dl rm

Edit: /usr/include/boost/coroutine/detail/symmetric_coroutine_call.hpp (32530B)

//          Copyright Oliver Kowalke 2009.
// 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_COROUTINES_DETAIL_SYMMETRIC_COROUTINE_CALL_H
#define BOOST_COROUTINES_DETAIL_SYMMETRIC_COROUTINE_CALL_H

#include <boost/assert.hpp>
#include <boost/config.hpp>
#include <boost/move/move.hpp>
#include <boost/utility/explicit_operator_bool.hpp>

#include <boost/coroutine/attributes.hpp>
#include <boost/coroutine/detail/config.hpp>
#include <boost/coroutine/detail/preallocated.hpp>
#include <boost/coroutine/detail/symmetric_coroutine_impl.hpp>
#include <boost/coroutine/detail/symmetric_coroutine_object.hpp>
#include <boost/coroutine/detail/symmetric_coroutine_yield.hpp>
#include <boost/coroutine/stack_allocator.hpp>
#include <boost/coroutine/stack_context.hpp>

#ifdef BOOST_HAS_ABI_HEADERS
#  include BOOST_ABI_PREFIX
#endif

namespace boost {
namespace coroutines {
namespace detail {

template< typename Arg >
class symmetric_coroutine_call
{
private:
    template< typename X >
    friend class symmetric_coroutine_yield;

typedef symmetric_coroutine_impl< Arg >   impl_type;

BOOST_MOVABLE_BUT_NOT_COPYABLE( symmetric_coroutine_call)

struct dummy {};

impl_type       *   impl_;

public:
    typedef Arg                                value_type;
    typedef symmetric_coroutine_yield< Arg >   yield_type;

symmetric_coroutine_call() BOOST_NOEXCEPT :
        impl_( 0)
    {}

#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
# ifdef BOOST_MSVC
    typedef void ( * coroutine_fn)( yield_type &);

explicit symmetric_coroutine_call( coroutine_fn fn,
                                       attributes const& attrs = attributes(),
                                       stack_allocator stack_alloc = stack_allocator() ) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg, coroutine_fn, stack_allocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    boost::forward< coroutine_fn >( fn), attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

template< typename StackAllocator >
    explicit symmetric_coroutine_call( coroutine_fn fn,
                                       attributes const& attrs,
                                       StackAllocator stack_alloc) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg, coroutine_fn, StackAllocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    boost::forward< coroutine_fn >( fn), attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }
# endif
    template< typename Fn >
    explicit symmetric_coroutine_call( BOOST_RV_REF( Fn) fn,
                                       attributes const& attrs = attributes(),
                                       stack_allocator stack_alloc = stack_allocator() ) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg, Fn, stack_allocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    boost::forward< Fn >( fn), attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

template< typename Fn, typename StackAllocator >
    explicit symmetric_coroutine_call( BOOST_RV_REF( Fn) fn,
                                       attributes const& attrs,
                                       StackAllocator stack_alloc) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg, Fn, StackAllocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    boost::forward< Fn >( fn), attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }
#else
    template< typename Fn >
    explicit symmetric_coroutine_call( Fn fn,
                                       attributes const& attrs = attributes(),
                                       stack_allocator stack_alloc = stack_allocator() ) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg, Fn, stack_allocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    fn, attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

template< typename Fn, typename StackAllocator >
    explicit symmetric_coroutine_call( Fn fn,
                                       attributes const& attrs,
                                       StackAllocator stack_alloc) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg, Fn, StackAllocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    fn, attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

template< typename Fn >
    explicit symmetric_coroutine_call( BOOST_RV_REF( Fn) fn,
                                       attributes const& attrs = attributes(),
                                       stack_allocator stack_alloc = stack_allocator() ) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg, Fn, stack_allocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    fn, attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

~symmetric_coroutine_call()
    {
        if ( 0 != impl_)
        {
            impl_->destroy();
            impl_ = 0;
        }
    }

symmetric_coroutine_call( BOOST_RV_REF( symmetric_coroutine_call) other) BOOST_NOEXCEPT :
        impl_( 0)
    { swap( other); }

symmetric_coroutine_call & operator=( BOOST_RV_REF( symmetric_coroutine_call) other) BOOST_NOEXCEPT
    {
        symmetric_coroutine_call tmp( boost::move( other) );
        swap( tmp);
        return * this;
    }

BOOST_EXPLICIT_OPERATOR_BOOL();

bool operator!() const BOOST_NOEXCEPT
    { return 0 == impl_ || impl_->is_complete() || impl_->is_running(); }

void swap( symmetric_coroutine_call & other) BOOST_NOEXCEPT
    { std::swap( impl_, other.impl_); }

symmetric_coroutine_call & operator()( Arg arg) BOOST_NOEXCEPT
    {
        BOOST_ASSERT( * this);

impl_->resume( arg);
        return * this;
    }
};

template< typename Arg >
class symmetric_coroutine_call< Arg & >
{
private:
    template< typename X >
    friend class symmetric_coroutine_yield;

typedef symmetric_coroutine_impl< Arg & >     impl_type;

BOOST_MOVABLE_BUT_NOT_COPYABLE( symmetric_coroutine_call)

struct dummy {};

impl_type       *   impl_;

public:
    typedef Arg                                    value_type;
    typedef symmetric_coroutine_yield< Arg & >     yield_type;

symmetric_coroutine_call() BOOST_NOEXCEPT :
        impl_( 0)
    {}

#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
# ifdef BOOST_MSVC
    typedef void ( * coroutine_fn)( yield_type &);

explicit symmetric_coroutine_call( coroutine_fn fn,
                                       attributes const& attrs = attributes(),
                                       stack_allocator stack_alloc = stack_allocator() ) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg &, coroutine_fn, stack_allocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    boost::forward< coroutine_fn >( fn), attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

template< typename StackAllocator >
    explicit symmetric_coroutine_call( coroutine_fn fn,
                                       attributes const& attrs,
                                       StackAllocator stack_alloc) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg &, coroutine_fn, StackAllocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    boost::forward< coroutine_fn >( fn), attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }
# endif
    template< typename Fn >
    explicit symmetric_coroutine_call( BOOST_RV_REF( Fn) fn,
                                       attributes const& attrs = attributes(),
                                       stack_allocator stack_alloc = stack_allocator() ) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg &, Fn, stack_allocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    boost::forward< Fn >( fn), attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

template< typename Fn, typename StackAllocator >
    explicit symmetric_coroutine_call( BOOST_RV_REF( Fn) fn,
                                       attributes const& attrs,
                                       StackAllocator stack_alloc) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg &, Fn, StackAllocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    boost::forward< Fn >( fn), attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }
#else
    template< typename Fn >
    explicit symmetric_coroutine_call( Fn fn,
                                       attributes const& attrs = attributes(),
                                       stack_allocator stack_alloc = stack_allocator() ) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg &, Fn, stack_allocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    fn, attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

template< typename Fn, typename StackAllocator >
    explicit symmetric_coroutine_call( Fn fn,
                                       attributes const& attrs,
                                       StackAllocator stack_alloc) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg &, Fn, StackAllocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    fn, attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

template< typename Fn >
    explicit symmetric_coroutine_call( BOOST_RV_REF( Fn) fn,
                                       attributes const& attrs = attributes(),
                                       stack_allocator stack_alloc = stack_allocator() ) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< Arg &, Fn, stack_allocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    fn, attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

~symmetric_coroutine_call()
    {
        if ( 0 != impl_)
        {
            impl_->destroy();
            impl_ = 0;
        }
    }

symmetric_coroutine_call( BOOST_RV_REF( symmetric_coroutine_call) other) BOOST_NOEXCEPT :
        impl_( 0)
    { swap( other); }

BOOST_EXPLICIT_OPERATOR_BOOL();

bool operator!() const BOOST_NOEXCEPT
    { return 0 == impl_ || impl_->is_complete() || impl_->is_running(); }

void swap( symmetric_coroutine_call & other) BOOST_NOEXCEPT
    { std::swap( impl_, other.impl_); }

symmetric_coroutine_call & operator()( Arg & arg) BOOST_NOEXCEPT
    {
        BOOST_ASSERT( * this);

impl_->resume( arg);
        return * this;
    }
};

template<>
class symmetric_coroutine_call< void >
{
private:
    template< typename X >
    friend class symmetric_coroutine_yield;

typedef symmetric_coroutine_impl< void >        impl_type;

BOOST_MOVABLE_BUT_NOT_COPYABLE( symmetric_coroutine_call)

struct dummy {};

impl_type       *   impl_;

public:
    typedef void                                     value_type;
    typedef symmetric_coroutine_yield< void >        yield_type;

symmetric_coroutine_call() BOOST_NOEXCEPT :
        impl_( 0)
    {}

#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
# ifdef BOOST_MSVC
    typedef void ( * coroutine_fn)( yield_type &);

explicit symmetric_coroutine_call( coroutine_fn fn,
                                       attributes const& attrs = attributes(),
                                       stack_allocator stack_alloc = stack_allocator() ) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< void, coroutine_fn, stack_allocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    boost::forward< coroutine_fn >( fn), attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

template< typename StackAllocator >
    explicit symmetric_coroutine_call( coroutine_fn fn,
                                       attributes const& attrs,
                                       StackAllocator stack_alloc) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< void, coroutine_fn, StackAllocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    boost::forward< coroutine_fn >( fn), attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }
# endif
    template< typename Fn >
    explicit symmetric_coroutine_call( BOOST_RV_REF( Fn) fn,
                                       attributes const& attrs = attributes(),
                                       stack_allocator stack_alloc = stack_allocator() ) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< void, Fn, stack_allocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    boost::forward< Fn >( fn), attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

template< typename Fn, typename StackAllocator >
    explicit symmetric_coroutine_call( BOOST_RV_REF( Fn) fn,
                                       attributes const& attrs,
                                       StackAllocator stack_alloc) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< void, Fn, StackAllocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    boost::forward< Fn >( fn), attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }
#else
    template< typename Fn >
    explicit symmetric_coroutine_call( Fn fn,
                                       attributes const& attrs = attributes(),
                                       stack_allocator stack_alloc = stack_allocator() ) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< void, Fn, stack_allocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    fn, attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

template< typename Fn, typename StackAllocator >
    explicit symmetric_coroutine_call( Fn fn,
                                       attributes const& attrs,
                                       StackAllocator stack_alloc) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< void, Fn, StackAllocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    fn, attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

template< typename Fn >
    explicit symmetric_coroutine_call( BOOST_RV_REF( Fn) fn,
                                       attributes const& attrs = attributes(),
                                       stack_allocator stack_alloc = stack_allocator() ) :
        impl_( 0)
    {
        // create a stack-context
        stack_context stack_ctx;
        // allocate the coroutine-stack
        stack_alloc.allocate( stack_ctx, attrs.size);
        BOOST_ASSERT( 0 != stack_ctx.sp);
        // typedef of internal coroutine-type
        typedef symmetric_coroutine_object< void, Fn, stack_allocator > object_t;
        // reserve space on top of coroutine-stack for internal coroutine-type
        std::size_t size = stack_ctx.size - sizeof( object_t);
        BOOST_ASSERT( 0 != size);
        void * sp = static_cast< char * >( stack_ctx.sp) - sizeof( object_t);
        BOOST_ASSERT( 0 != sp);
        // placement new for internal coroutine
        impl_ = new ( sp) object_t(
                    fn, attrs, preallocated( sp, size, stack_ctx), stack_alloc); 
        BOOST_ASSERT( impl_);
    }

~symmetric_coroutine_call()
    {
        if ( 0 != impl_)
        {
            impl_->destroy();
            impl_ = 0;
        }
    }

inline symmetric_coroutine_call( BOOST_RV_REF( symmetric_coroutine_call) other) BOOST_NOEXCEPT :
        impl_( 0)
    { swap( other); }

inline symmetric_coroutine_call & operator=( BOOST_RV_REF( symmetric_coroutine_call) other) BOOST_NOEXCEPT
    {
        symmetric_coroutine_call tmp( boost::move( other) );
        swap( tmp);
        return * this;
    }

BOOST_EXPLICIT_OPERATOR_BOOL();

inline bool operator!() const BOOST_NOEXCEPT
    { return 0 == impl_ || impl_->is_complete() || impl_->is_running(); }

inline void swap( symmetric_coroutine_call & other) BOOST_NOEXCEPT
    { std::swap( impl_, other.impl_); }

inline symmetric_coroutine_call & operator()() BOOST_NOEXCEPT
    {
        BOOST_ASSERT( * this);

impl_->resume();
        return * this;
    }
};

template< typename Arg >
void swap( symmetric_coroutine_call< Arg > & l,
           symmetric_coroutine_call< Arg > & r)
{ l.swap( r); }

}}}

#ifdef BOOST_HAS_ABI_HEADERS
#  include BOOST_ABI_SUFFIX
#endif

#endif // BOOST_COROUTINES_DETAIL_SYMMETRIC_COROUTINE_CALL_H

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