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//
// Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// 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)
//
// Official repository: https://github.com/boostorg/beast
//
#ifndef BOOST_BEAST_IMPL_HANDLER_PTR_HPP
#define BOOST_BEAST_IMPL_HANDLER_PTR_HPP
#include <boost/asio/associated_allocator.hpp>
#include <boost/assert.hpp>
#include <memory>
namespace boost {
namespace beast {
template<class T, class Handler>
template<class DeducedHandler, class... Args>
inline
handler_ptr<T, Handler>::P::
P(DeducedHandler&& h, Args&&... args)
: n(1)
, handler(std::forward<DeducedHandler>(h))
{
typename std::allocator_traits<
boost::asio::associated_allocator_t<Handler>>::
template rebind_alloc<T> alloc{
boost::asio::get_associated_allocator(handler)};
t = std::allocator_traits<decltype(alloc)>::allocate(alloc, 1);
try
{
t = new(t) T{handler,
std::forward<Args>(args)...};
}
catch(...)
{
std::allocator_traits<
decltype(alloc)>::deallocate(alloc, t, 1);
throw;
}
}
template<class T, class Handler>
handler_ptr<T, Handler>::
~handler_ptr()
{
if(! p_)
return;
if(--p_->n)
return;
if(p_->t)
{
p_->t->~T();
typename std::allocator_traits<
boost::asio::associated_allocator_t<Handler>>::
template rebind_alloc<T> alloc{
boost::asio::get_associated_allocator(
p_->handler)};
std::allocator_traits<
decltype(alloc)>::deallocate(alloc, p_->t, 1);
}
delete p_;
}
template<class T, class Handler>
handler_ptr<T, Handler>::
handler_ptr(handler_ptr&& other)
: p_(other.p_)
{
other.p_ = nullptr;
}
template<class T, class Handler>
handler_ptr<T, Handler>::
handler_ptr(handler_ptr const& other)
: p_(other.p_)
{
if(p_)
++p_->n;
}
template<class T, class Handler>
template<class... Args>
handler_ptr<T, Handler>::
handler_ptr(Handler&& handler, Args&&... args)
: p_(new P{std::move(handler),
std::forward<Args>(args)...})
{
BOOST_STATIC_ASSERT(! std::is_array<T>::value);
}
template<class T, class Handler>
template<class... Args>
handler_ptr<T, Handler>::
handler_ptr(Handler const& handler, Args&&... args)
: p_(new P{handler, std::forward<Args>(args)...})
{
BOOST_STATIC_ASSERT(! std::is_array<T>::value);
}
template<class T, class Handler>
auto
handler_ptr<T, Handler>::
release_handler() ->
handler_type
{
BOOST_ASSERT(p_);
BOOST_ASSERT(p_->t);
p_->t->~T();
typename std::allocator_traits<
boost::asio::associated_allocator_t<Handler>>::
template rebind_alloc<T> alloc{
boost::asio::get_associated_allocator(
p_->handler)};
std::allocator_traits<
decltype(alloc)>::deallocate(alloc, p_->t, 1);
p_->t = nullptr;
return std::move(p_->handler);
}
template<class T, class Handler>
template<class... Args>
void
handler_ptr<T, Handler>::
invoke(Args&&... args)
{
BOOST_ASSERT(p_);
BOOST_ASSERT(p_->t);
p_->t->~T();
typename std::allocator_traits<
boost::asio::associated_allocator_t<Handler>>::
template rebind_alloc<T> alloc{
boost::asio::get_associated_allocator(
p_->handler)};
std::allocator_traits<
decltype(alloc)>::deallocate(alloc, p_->t, 1);
p_->t = nullptr;
p_->handler(std::forward<Args>(args)...);
}
} // beast
} // boost
#endif
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