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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_BUFFERS_SUFFIX_IPP
#define BOOST_BEAST_IMPL_BUFFERS_SUFFIX_IPP
#include <boost/beast/core/type_traits.hpp>
#include <boost/type_traits.hpp>
#include <algorithm>
#include <cstdint>
#include <iterator>
#include <type_traits>
#include <utility>
namespace boost {
namespace beast {
template<class Buffers>
class buffers_suffix<Buffers>::const_iterator
{
friend class buffers_suffix<Buffers>;
using iter_type = typename
detail::buffer_sequence_iterator<Buffers>::type;
iter_type it_;
buffers_suffix const* b_ = nullptr;
public:
using value_type = typename std::conditional<
boost::is_convertible<typename
std::iterator_traits<iter_type>::value_type,
boost::asio::mutable_buffer>::value,
boost::asio::mutable_buffer,
boost::asio::const_buffer>::type;
using pointer = value_type const*;
using reference = value_type;
using difference_type = std::ptrdiff_t;
using iterator_category =
std::bidirectional_iterator_tag;
const_iterator() = default;
const_iterator(const_iterator&& other) = default;
const_iterator(const_iterator const& other) = default;
const_iterator& operator=(const_iterator&& other) = default;
const_iterator& operator=(const_iterator const& other) = default;
bool
operator==(const_iterator const& other) const
{
return b_ == other.b_ && it_ == other.it_;
}
bool
operator!=(const_iterator const& other) const
{
return !(*this == other);
}
reference
operator*() const
{
return it_ == b_->begin_
? value_type{*it_} + b_->skip_
: *it_;
}
pointer
operator->() const = delete;
const_iterator&
operator++()
{
++it_;
return *this;
}
const_iterator
operator++(int)
{
auto temp = *this;
++(*this);
return temp;
}
const_iterator&
operator--()
{
--it_;
return *this;
}
const_iterator
operator--(int)
{
auto temp = *this;
--(*this);
return temp;
}
private:
const_iterator(buffers_suffix const& b,
iter_type it)
: it_(it)
, b_(&b)
{
}
};
//------------------------------------------------------------------------------
template<class Buffers>
buffers_suffix<Buffers>::
buffers_suffix()
: begin_(boost::asio::buffer_sequence_begin(bs_))
{
}
template<class Buffers>
buffers_suffix<Buffers>::
buffers_suffix(buffers_suffix&& other)
: buffers_suffix(std::move(other),
std::distance<iter_type>(
boost::asio::buffer_sequence_begin(
other.bs_), other.begin_))
{
}
template<class Buffers>
buffers_suffix<Buffers>::
buffers_suffix(buffers_suffix const& other)
: buffers_suffix(other,
std::distance<iter_type>(
boost::asio::buffer_sequence_begin(
other.bs_), other.begin_))
{
}
template<class Buffers>
buffers_suffix<Buffers>::
buffers_suffix(Buffers const& bs)
: bs_(bs)
, begin_(boost::asio::buffer_sequence_begin(bs_))
{
static_assert(
boost::asio::is_const_buffer_sequence<Buffers>::value||
boost::asio::is_mutable_buffer_sequence<Buffers>::value,
"BufferSequence requirements not met");
}
template<class Buffers>
template<class... Args>
buffers_suffix<Buffers>::
buffers_suffix(boost::in_place_init_t, Args&&... args)
: bs_(std::forward<Args>(args)...)
, begin_(boost::asio::buffer_sequence_begin(bs_))
{
static_assert(sizeof...(Args) > 0,
"Missing constructor arguments");
static_assert(
std::is_constructible<Buffers, Args...>::value,
"Buffers not constructible from arguments");
}
template<class Buffers>
auto
buffers_suffix<Buffers>::
operator=(buffers_suffix&& other) ->
buffers_suffix&
{
auto const dist = std::distance<iter_type>(
boost::asio::buffer_sequence_begin(other.bs_),
other.begin_);
bs_ = std::move(other.bs_);
begin_ = std::next(
boost::asio::buffer_sequence_begin(bs_),
dist);
skip_ = other.skip_;
return *this;
}
template<class Buffers>
auto
buffers_suffix<Buffers>::
operator=(buffers_suffix const& other) ->
buffers_suffix&
{
auto const dist = std::distance<iter_type>(
boost::asio::buffer_sequence_begin(other.bs_),
other.begin_);
bs_ = other.bs_;
begin_ = std::next(
boost::asio::buffer_sequence_begin(bs_), dist);
skip_ = other.skip_;
return *this;
}
template<class Buffers>
inline
auto
buffers_suffix<Buffers>::
begin() const ->
const_iterator
{
return const_iterator{*this, begin_};
}
template<class Buffers>
inline
auto
buffers_suffix<Buffers>::
end() const ->
const_iterator
{
return const_iterator{*this,
boost::asio::buffer_sequence_end(bs_)};
}
template<class Buffers>
void
buffers_suffix<Buffers>::
consume(std::size_t amount)
{
using boost::asio::buffer_size;
auto const end =
boost::asio::buffer_sequence_end(bs_);
for(;amount > 0 && begin_ != end; ++begin_)
{
auto const len =
buffer_size(*begin_) - skip_;
if(amount < len)
{
skip_ += amount;
break;
}
amount -= len;
skip_ = 0;
}
}
} // beast
} // boost
#endif
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