mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-12-03 01:15:43 +00:00
249 lines
7.7 KiB
C++
249 lines
7.7 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_VALARRAY_SLICE_ARRAY_HPP
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#define SPROUT_VALARRAY_SLICE_ARRAY_HPP
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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#include <sprout/utility/swap.hpp>
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#include <sprout/iterator/index_iterator.hpp>
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#include <sprout/iterator/reverse_iterator.hpp>
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#include <sprout/algorithm/cxx14/copy.hpp>
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#include <sprout/algorithm/cxx14/fill.hpp>
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#include <sprout/valarray/valarray_fwd.hpp>
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namespace sprout {
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//
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// slice
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//
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class slice {
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private:
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std::size_t start_;
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std::size_t size_;
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std::size_t stride_;
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public:
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SPROUT_CONSTEXPR slice()
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: start_(), size_(), stride_()
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{}
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SPROUT_CONSTEXPR slice(std::size_t start, std::size_t size, std::size_t stride)
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: start_(start), size_(size), stride_(stride)
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{}
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SPROUT_CONSTEXPR std::size_t start() const {
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return start_;
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}
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SPROUT_CONSTEXPR std::size_t size() const {
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return size_;
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}
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SPROUT_CONSTEXPR std::size_t stride() const {
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return stride_;
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}
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};
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//
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// slice_array
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//
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template<typename T, std::size_t N>
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class slice_array {
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friend class sprout::valarray<T, N>;
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private:
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typedef sprout::valarray<T, N> valarray_type;
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public:
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typedef typename valarray_type::value_type value_type;
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typedef typename valarray_type::reference reference;
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typedef typename valarray_type::size_type size_type;
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typedef typename valarray_type::difference_type difference_type;
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typedef typename valarray_type::pointer pointer;
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typedef sprout::index_iterator<slice_array const&> iterator;
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typedef sprout::reverse_iterator<iterator> reverse_iterator;
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public:
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SPROUT_STATIC_CONSTEXPR size_type static_size = valarray_type::static_size;
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private:
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sprout::value_holder<valarray_type&> arr_;
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sprout::slice slice_;
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private:
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slice_array() SPROUT_DELETED_FUNCTION_DECL
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SPROUT_CONSTEXPR slice_array(sprout::valarray<T, N>& arr, sprout::slice const& slice)
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: arr_(arr), slice_(slice)
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{}
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public:
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SPROUT_CONSTEXPR slice_array(slice_array const& other)
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: arr_(other.arr_), slice_(other.slice_)
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{}
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template<std::size_t N2>
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SPROUT_CXX14_CONSTEXPR slice_array const&
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operator=(slice_array<T, N2> const& ar) const {
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sprout::copy(ar.begin(), ar.end(), begin());
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return *this;
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}
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template<std::size_t N2>
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SPROUT_CXX14_CONSTEXPR void
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operator=(sprout::valarray<T, N2> const& ar) const {
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sprout::copy(ar.begin(), ar.end(), begin());
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}
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SPROUT_CXX14_CONSTEXPR void
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operator=(T const& value) const {
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sprout::fill(begin(), end(), value);
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}
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template<std::size_t N2>
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SPROUT_CXX14_CONSTEXPR void
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operator+=(sprout::valarray<T, N2> const& xs) const {
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iterator it2 = begin();
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for (typename sprout::valarray<T, N2>::const_iterator it = xs.begin(), last = xs.end(); it != last; ++it, ++it2) {
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*it2 += *it;
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}
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}
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template<std::size_t N2>
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SPROUT_CXX14_CONSTEXPR void
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operator-=(sprout::valarray<T, N2> const& xs) const {
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iterator it2 = begin();
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for (typename sprout::valarray<T, N2>::const_iterator it = xs.begin(), last = xs.end(); it != last; ++it, ++it2) {
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*it2 -= *it;
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}
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}
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template<std::size_t N2>
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SPROUT_CXX14_CONSTEXPR void
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operator*=(sprout::valarray<T, N2> const& xs) const {
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iterator it2 = begin();
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for (typename sprout::valarray<T, N2>::const_iterator it = xs.begin(), last = xs.end(); it != last; ++it, ++it2) {
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*it2 *= *it;
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}
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}
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template<std::size_t N2>
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SPROUT_CXX14_CONSTEXPR void
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operator/=(sprout::valarray<T, N2> const& xs) const {
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iterator it2 = begin();
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for (typename sprout::valarray<T, N2>::const_iterator it = xs.begin(), last = xs.end(); it != last; ++it, ++it2) {
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*it2 /= *it;
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}
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}
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template<std::size_t N2>
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SPROUT_CXX14_CONSTEXPR void
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operator%=(sprout::valarray<T, N2> const& xs) const {
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iterator it2 = begin();
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for (typename sprout::valarray<T, N2>::const_iterator it = xs.begin(), last = xs.end(); it != last; ++it, ++it2) {
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*it2 %= *it;
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}
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}
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template<std::size_t N2>
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SPROUT_CXX14_CONSTEXPR void
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operator&=(sprout::valarray<T, N2> const& xs) const {
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iterator it2 = begin();
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for (typename sprout::valarray<T, N2>::const_iterator it = xs.begin(), last = xs.end(); it != last; ++it, ++it2) {
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*it2 &= *it;
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}
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}
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template<std::size_t N2>
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SPROUT_CXX14_CONSTEXPR void
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operator|=(sprout::valarray<T, N2> const& xs) const {
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iterator it2 = begin();
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for (typename sprout::valarray<T, N2>::const_iterator it = xs.begin(), last = xs.end(); it != last; ++it, ++it2) {
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*it2 |= *it;
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}
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}
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template<std::size_t N2>
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SPROUT_CXX14_CONSTEXPR void
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operator^=(sprout::valarray<T, N2> const& xs) const {
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iterator it2 = begin();
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for (typename sprout::valarray<T, N2>::const_iterator it = xs.begin(), last = xs.end(); it != last; ++it, ++it2) {
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*it2 ^= *it;
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}
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}
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template<std::size_t N2>
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SPROUT_CXX14_CONSTEXPR void
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operator<<=(sprout::valarray<T, N2> const& xs) const {
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iterator it2 = begin();
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for (typename sprout::valarray<T, N2>::const_iterator it = xs.begin(), last = xs.end(); it != last; ++it, ++it2) {
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*it2 <<= *it;
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}
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}
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template<std::size_t N2>
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SPROUT_CXX14_CONSTEXPR void
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operator>>=(sprout::valarray<T, N2> const& xs) const {
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iterator it2 = begin();
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for (typename sprout::valarray<T, N2>::const_iterator it = xs.begin(), last = xs.end(); it != last; ++it, ++it2) {
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*it2 >>= *it;
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}
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}
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SPROUT_CXX14_CONSTEXPR void
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swap(slice_array& other) SPROUT_NOEXCEPT {
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sprout::swap(arr_, other.arr_);
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sprout::swap(slice_, other.slice_);
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}
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// iterators:
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SPROUT_CONSTEXPR iterator
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begin() const {
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return iterator(*this, 0);
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}
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SPROUT_CONSTEXPR iterator
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end() const {
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return iterator(*this, size());
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}
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SPROUT_CONSTEXPR reverse_iterator
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rbegin() const {
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return reverse_iterator(end());
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}
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SPROUT_CONSTEXPR reverse_iterator
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rend() const {
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return reverse_iterator(begin());
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}
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// capacity:
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SPROUT_CONSTEXPR size_type
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size() const SPROUT_NOEXCEPT {
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return slice_.size();
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}
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SPROUT_CONSTEXPR bool
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empty() const SPROUT_NOEXCEPT {
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return size() == 0;
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}
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// element access:
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SPROUT_CONSTEXPR reference
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operator[](size_type i) const {
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return (*arr_)[slice_.start() + slice_.stride() * i];
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}
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SPROUT_CONSTEXPR reference
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at(size_type i) const {
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return arr_->at(slice_.start() + slice_.stride() * i);
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}
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SPROUT_CONSTEXPR reference
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front() const {
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return (*this)[0];
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}
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SPROUT_CONSTEXPR reference
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back() const {
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return (*this)[size() - 1];
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}
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// others:
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SPROUT_CONSTEXPR iterator
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nth(size_type i) const {
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return i < size() ? begin() + i
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: (throw std::out_of_range("slice_array<>: index out of range"), iterator())
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;
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}
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SPROUT_CONSTEXPR size_type
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index_of(iterator p) const SPROUT_NOEXCEPT {
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return p - begin();
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}
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};
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template<typename T, std::size_t N>
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SPROUT_CONSTEXPR_OR_CONST typename sprout::slice_array<T, N>::size_type sprout::slice_array<T, N>::static_size;
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//
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// swap
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//
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template<typename T, std::size_t N>
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inline SPROUT_CXX14_CONSTEXPR void
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swap(sprout::slice_array<T, N>& lhs, sprout::slice_array<T, N>& rhs)
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SPROUT_NOEXCEPT_IF_EXPR(lhs.swap(rhs))
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{
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lhs.swap(rhs);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_VALARRAY_SLICE_ARRAY_HPP
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