premiere-libtorrent/include/libtorrent/aux_/vector.hpp

135 lines
4.3 KiB
C++

/*
Copyright (c) 2016, Arvid Norberg
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TORRENT_VECTOR_HPP
#define TORRENT_VECTOR_HPP
#include <vector>
#include <type_traits>
#include "libtorrent/units.hpp"
#include "libtorrent/assert.hpp"
namespace libtorrent { namespace aux {
template <typename T>
struct underlying_index_t { using type = T; };
template <typename U, typename Tag>
struct underlying_index_t<aux::strong_typedef<U, Tag>> { using type = U; };
template <typename T, typename IndexType = int>
struct vector : std::vector<T>
{
using base = std::vector<T>;
using underlying_index = typename underlying_index_t<IndexType>::type;
// pull in constructors from base class
using base::base;
auto operator[](IndexType idx) const -> decltype(this->base::operator[](underlying_index()))
{
TORRENT_ASSERT(idx >= IndexType(0));
TORRENT_ASSERT(idx < end_index());
return this->base::operator[](std::size_t(static_cast<underlying_index>(idx)));
}
auto operator[](IndexType idx) -> decltype(this->base::operator[](underlying_index()))
{
TORRENT_ASSERT(idx >= IndexType(0));
TORRENT_ASSERT(idx < end_index());
return this->base::operator[](std::size_t(static_cast<underlying_index>(idx)));
}
IndexType end_index() const
{
TORRENT_ASSERT(this->size() <= std::size_t(std::numeric_limits<underlying_index>::max()));
return IndexType(static_cast<underlying_index>(this->size()));
}
template <typename U = underlying_index, typename Cond
= typename std::enable_if<std::is_signed<U>::value>::type>
void resize(underlying_index s)
{
TORRENT_ASSERT(s >= 0);
this->base::resize(std::size_t(s));
}
template <typename U = underlying_index, typename Cond
= typename std::enable_if<std::is_signed<U>::value>::type>
void resize(underlying_index s, T const& v)
{
TORRENT_ASSERT(s >= 0);
this->base::resize(std::size_t(s), v);
}
void resize(std::size_t s)
{
TORRENT_ASSERT(s <= std::size_t((std::numeric_limits<underlying_index>::max)()));
this->base::resize(s);
}
void resize(std::size_t s, T const& v)
{
TORRENT_ASSERT(s <= std::size_t((std::numeric_limits<underlying_index>::max)()));
this->base::resize(s, v);
}
};
template <typename Iter>
struct iterator_range
{
Iter _begin, _end;
Iter begin() { return _begin; }
Iter end() { return _end; }
};
template <typename T, typename IndexType>
iterator_range<T*> range(vector<T, IndexType>& vec
, IndexType begin, IndexType end)
{
using type = typename underlying_index_t<IndexType>::type;
return {vec.data() + static_cast<type>(begin), vec.data() + static_cast<type>(end)};
}
template <typename T, typename IndexType>
iterator_range<T const*> range(vector<T, IndexType> const& vec
, IndexType begin, IndexType end)
{
using type = typename underlying_index_t<IndexType>::type;
return {vec.data() + static_cast<type>(begin), vec.data() + static_cast<type>(end)};
}
}}
#endif