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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>
void
handler_ptr<T, Handler>::
clear()
{
typename beast::detail::allocator_traits<
boost::asio::associated_allocator_t<
Handler>>::template rebind_alloc<T> alloc(
boost::asio::get_associated_allocator(
handler()));
beast::detail::allocator_traits<
decltype(alloc)>::destroy(alloc, t_);
beast::detail::allocator_traits<
decltype(alloc)>::deallocate(alloc, t_, 1);
t_ = nullptr;
}
template<class T, class Handler>
handler_ptr<T, Handler>::
~handler_ptr()
{
if(t_)
{
clear();
handler().~Handler();
}
}
template<class T, class Handler>
handler_ptr<T, Handler>::
handler_ptr(handler_ptr&& other)
: t_(other.t_)
{
if(other.t_)
{
new(&h_) Handler(std::move(other.handler()));
other.handler().~Handler();
other.t_ = nullptr;
}
}
template<class T, class Handler>
template<class DeducedHandler, class... Args>
handler_ptr<T, Handler>::
handler_ptr(DeducedHandler&& h, Args&&... args)
{
BOOST_STATIC_ASSERT(! std::is_array<T>::value);
typename beast::detail::allocator_traits<
boost::asio::associated_allocator_t<
Handler>>::template rebind_alloc<T> alloc{
boost::asio::get_associated_allocator(h)};
using A = decltype(alloc);
bool destroy = false;
auto deleter = [&alloc, &destroy](T* p)
{
if(destroy)
beast::detail::allocator_traits<A>::destroy(alloc, p);
beast::detail::allocator_traits<A>::deallocate(alloc, p, 1);
};
std::unique_ptr<T, decltype(deleter)> t{
beast::detail::allocator_traits<A>::allocate(alloc, 1), deleter};
beast::detail::allocator_traits<A>::construct(alloc, t.get(),
static_cast<DeducedHandler const&>(h),
std::forward<Args>(args)...);
destroy = true;
new(&h_) Handler(std::forward<DeducedHandler>(h));
t_ = t.release();
}
template<class T, class Handler>
auto
handler_ptr<T, Handler>::
release_handler() ->
handler_type
{
BOOST_ASSERT(t_);
clear();
auto deleter = [](Handler* h)
{
h->~Handler();
};
std::unique_ptr<
Handler, decltype(deleter)> destroyer{
&handler(), deleter};
return std::move(handler());
}
template<class T, class Handler>
template<class... Args>
void
handler_ptr<T, Handler>::
invoke(Args&&... args)
{
BOOST_ASSERT(t_);
clear();
auto deleter = [](Handler* h)
{
boost::ignore_unused(h); // fix #1119
h->~Handler();
};
std::unique_ptr<
Handler, decltype(deleter)> destroyer{
&handler(), deleter};
handler()(std::forward<Args>(args)...);
}
} // beast
} // boost
#endif
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