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//
// Copyright (c) 2018 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_CORE_DETAIL_BUFFER_HPP
#define BOOST_BEAST_CORE_DETAIL_BUFFER_HPP
#include <boost/beast/core/error.hpp>
#include <boost/optional.hpp>
#include <stdexcept>
namespace boost {
namespace beast {
namespace detail {
template<
class DynamicBuffer,
class ErrorValue>
auto
dynamic_buffer_prepare_noexcept(
DynamicBuffer& buffer,
std::size_t size,
error_code& ec,
ErrorValue ev) ->
boost::optional<typename
DynamicBuffer::mutable_buffers_type>
{
if(buffer.max_size() - buffer.size() < size)
{
// length error
ec = ev;
return boost::none;
}
boost::optional<typename
DynamicBuffer::mutable_buffers_type> result;
result.emplace(buffer.prepare(size));
ec.assign(0, ec.category());
return result;
}
template<
class DynamicBuffer,
class ErrorValue>
auto
dynamic_buffer_prepare(
DynamicBuffer& buffer,
std::size_t size,
error_code& ec,
ErrorValue ev) ->
boost::optional<typename
DynamicBuffer::mutable_buffers_type>
{
#ifndef BOOST_NO_EXCEPTIONS
try
{
boost::optional<typename
DynamicBuffer::mutable_buffers_type> result;
result.emplace(buffer.prepare(size));
ec.assign(0, ec.category());
return result;
}
catch(std::length_error const&)
{
ec = ev;
}
return boost::none;
#else
return dynamic_buffer_prepare_noexcept(
buffer, size, ec, ev);
#endif
}
} // detail
} // beast
} // boost
#endif
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