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Original file line number | Diff line number | Diff line change |
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#pragma once | ||
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#include "huffman/src/detail/iterator_interface.hpp" | ||
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#include <cstddef> | ||
#include <iterator> | ||
#include <numeric> | ||
#include <ranges> | ||
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namespace starflate::huffman::detail { | ||
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template <std::ranges::view V> | ||
class flattened_symbol_bitsize_view | ||
: public std::ranges::view_interface<flattened_symbol_bitsize_view<V>> | ||
{ | ||
V base_; | ||
std::size_t size_; | ||
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using child_view_type = std::remove_cvref_t<std::ranges::range_value_t<V>>; | ||
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public: | ||
using base_type = V; | ||
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class iterator | ||
{ | ||
const flattened_symbol_bitsize_view* parent_; | ||
std::size_t offset1_; | ||
std::size_t offset2_; | ||
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public: | ||
using iterator_category = std::forward_iterator_tag; | ||
using difference_type = std::ranges::range_difference_t<child_view_type>; | ||
using value_type = std::ranges::range_value_t<child_view_type>; | ||
using reference = std::ranges::range_reference_t<child_view_type>; | ||
using pointer = void; | ||
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iterator() = default; | ||
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constexpr iterator( | ||
const flattened_symbol_bitsize_view& parent, | ||
std::size_t offset1, | ||
std::size_t offset2) | ||
: parent_{&parent}, offset1_{offset1}, offset2_{offset2} | ||
{} | ||
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constexpr auto operator*() const -> reference | ||
{ | ||
using D = difference_type; | ||
return parent_ | ||
->base()[static_cast<D>(offset1_)][static_cast<D>(offset2_)]; | ||
} | ||
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constexpr auto operator++() & -> iterator& | ||
{ | ||
using D = difference_type; | ||
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if (++offset2_ == static_cast<std::size_t>(parent_->base()[static_cast<D>(offset1_)].size())) { | ||
++offset1_; | ||
offset2_ = {}; | ||
} | ||
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return *this; | ||
} | ||
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constexpr auto operator++(int) -> iterator | ||
{ | ||
auto tmp = *this; | ||
++*this; | ||
return tmp; | ||
} | ||
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friend constexpr auto | ||
operator==(const iterator&, const iterator&) -> bool = default; | ||
}; | ||
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constexpr explicit flattened_symbol_bitsize_view(V base) | ||
: base_{std::move(base)}, | ||
size_{std::accumulate( | ||
std::ranges::cbegin(base_), | ||
std::ranges::cend(base_), | ||
0UZ, | ||
[](auto acc, const auto& subrange) { | ||
return acc + subrange.size(); | ||
})} | ||
{} | ||
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constexpr auto base() const -> base_type { return base_; } | ||
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constexpr auto size() const -> std::size_t { return size_; } | ||
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[[nodiscard]] | ||
constexpr auto begin() const -> iterator | ||
{ | ||
return {*this, 0, 0}; | ||
} | ||
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[[nodiscard]] | ||
constexpr auto end() const -> iterator | ||
{ | ||
return {*this, base().size(), 0}; | ||
} | ||
}; | ||
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} // namespace starflate::huffman::detail | ||
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// flattened_symbol_bitsize_view is only created to adapt an input range during | ||
// construction | ||
template <class V> | ||
inline constexpr bool std::ranges::enable_borrowed_range< | ||
::starflate::huffman::detail::flattened_symbol_bitsize_view<V>> = true; |
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#pragma once | ||
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#include <type_traits> | ||
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namespace starflate::huffman::detail { | ||
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/// Checks if a type is a specialization of a class template | ||
/// @tparam T type | ||
/// @tparam primary class template | ||
/// | ||
/// @see https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2020/p2098r1.pdf | ||
/// | ||
/// | ||
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template <class T, template <class...> class primary> | ||
struct is_specialization_of : std::false_type | ||
{}; | ||
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template <template <class...> class primary, class... Args> | ||
struct is_specialization_of<primary<Args...>, primary> : std::true_type | ||
{}; | ||
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template <class T, template <class...> class primary> | ||
inline constexpr auto is_specialization_of_v = | ||
is_specialization_of<T, primary>::value; | ||
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} // namespace starflate::huffman::detail |
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Original file line number | Diff line number | Diff line change |
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#pragma once | ||
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#include "huffman/src/utility.hpp" | ||
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#include <concepts> | ||
#include <ranges> | ||
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namespace starflate::huffman { | ||
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/// An inclusive span of symbols | ||
/// | ||
template <symbol S> | ||
class symbol_span : public std::ranges::view_interface<symbol_span<S>> | ||
{ | ||
S first_; | ||
S last_; | ||
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using range_type = std::ranges::iota_view<S, S>; | ||
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constexpr auto as_range() const -> range_type | ||
{ | ||
auto tmp = last_; | ||
return {first_, ++tmp}; | ||
} | ||
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public: | ||
using symbol_type = S; | ||
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using iterator = std::ranges::iterator_t<range_type>; | ||
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/// Construct a symbol span of a single symbol | ||
/// @param first symbol | ||
/// | ||
constexpr symbol_span(symbol_type first) : symbol_span{first, first} {} | ||
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/// Construct a symbol span from first to last, inclusive | ||
/// @param first, last inclusive symbol range | ||
/// @pre first <= last | ||
/// | ||
constexpr symbol_span(symbol_type first, symbol_type last) | ||
: first_{first}, last_{last} | ||
{ | ||
assert(first <= last); | ||
} | ||
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[[nodiscard]] | ||
constexpr auto begin() const -> iterator | ||
{ | ||
return as_range().begin(); | ||
} | ||
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[[nodiscard]] | ||
constexpr auto end() const -> iterator | ||
{ | ||
return as_range().end(); | ||
} | ||
}; | ||
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} // namespace starflate::huffman |
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