614 lines
21 KiB
C++
614 lines
21 KiB
C++
#pragma once
|
|
/*
|
|
* Created by Brett on 06/02/24.
|
|
* Licensed under GNU General Public License V3.0
|
|
* See LICENSE file for license detail
|
|
*/
|
|
|
|
#ifndef BLT_RANGES_H
|
|
#define BLT_RANGES_H
|
|
|
|
#include <blt/std/types.h>
|
|
#include <blt/std/meta.h>
|
|
#include <type_traits>
|
|
#include <iterator>
|
|
#include <memory>
|
|
#include <utility>
|
|
#include <limits>
|
|
|
|
namespace blt
|
|
{
|
|
namespace itr
|
|
{
|
|
|
|
template<typename Begin, typename End>
|
|
class itr_container
|
|
{
|
|
public:
|
|
itr_container(Begin&& begin, End&& end): begin_(std::forward<Begin>(begin)), end_(std::forward<End>(end))
|
|
{}
|
|
|
|
Begin begin()
|
|
{
|
|
return begin_;
|
|
}
|
|
|
|
End end()
|
|
{
|
|
return end_;
|
|
}
|
|
|
|
private:
|
|
Begin begin_;
|
|
End end_;
|
|
};
|
|
|
|
template<typename TYPE_ITR>
|
|
class iterator_base
|
|
{
|
|
public:
|
|
using value_type = blt::meta::value_type_t<TYPE_ITR, std::remove_pointer_t<TYPE_ITR>>;
|
|
using difference_type = blt::meta::difference_t<TYPE_ITR, std::ptrdiff_t>;
|
|
using pointer = blt::meta::pointer_t<TYPE_ITR, TYPE_ITR>;
|
|
using reference = blt::meta::reference_t<TYPE_ITR, std::remove_pointer_t<TYPE_ITR>&>;
|
|
using const_reference = blt::meta::const_reference_t<TYPE_ITR, const std::remove_pointer_t<TYPE_ITR>&>;
|
|
};
|
|
|
|
template<typename TYPE_ITR>
|
|
class iterator
|
|
{
|
|
public:
|
|
using iterator_category = std::input_iterator_tag;
|
|
using value_type = typename iterator_base<TYPE_ITR>::value_type;
|
|
using difference_type = typename iterator_base<TYPE_ITR>::difference_type;
|
|
using pointer = typename iterator_base<TYPE_ITR>::pointer;
|
|
using reference = typename iterator_base<TYPE_ITR>::reference;
|
|
using const_reference = typename iterator_base<TYPE_ITR>::const_reference;
|
|
private:
|
|
blt::size_t index;
|
|
TYPE_ITR current;
|
|
public:
|
|
explicit iterator(TYPE_ITR current, blt::size_t index): index(index), current(std::move(current))
|
|
{}
|
|
|
|
auto iter()
|
|
{
|
|
return current;
|
|
}
|
|
|
|
iterator& operator++()
|
|
{
|
|
++index;
|
|
++current;
|
|
return *this;
|
|
}
|
|
|
|
bool operator==(iterator other) const
|
|
{
|
|
return current == other.current;
|
|
}
|
|
|
|
bool operator!=(iterator other) const
|
|
{
|
|
return current != other.current;
|
|
}
|
|
|
|
std::pair<blt::size_t, const_reference> operator*() const
|
|
{
|
|
return {index, *current};
|
|
};
|
|
|
|
std::pair<blt::size_t, reference> operator*()
|
|
{
|
|
return {index, *current};
|
|
};
|
|
};
|
|
|
|
template<typename TYPE_ITR>
|
|
class reverse_iterator
|
|
{
|
|
public:
|
|
using iterator_category = std::input_iterator_tag;
|
|
using value_type = typename iterator_base<TYPE_ITR>::value_type;
|
|
using difference_type = typename iterator_base<TYPE_ITR>::difference_type;
|
|
using pointer = typename iterator_base<TYPE_ITR>::pointer;
|
|
using reference = typename iterator_base<TYPE_ITR>::reference;
|
|
using const_reference = typename iterator_base<TYPE_ITR>::const_reference;
|
|
private:
|
|
blt::size_t index;
|
|
TYPE_ITR current;
|
|
public:
|
|
explicit reverse_iterator(TYPE_ITR current, blt::size_t index): index(index), current(std::move(current))
|
|
{}
|
|
|
|
auto iter()
|
|
{
|
|
return current;
|
|
}
|
|
|
|
reverse_iterator& operator++()
|
|
{
|
|
--index;
|
|
--current;
|
|
return *this;
|
|
}
|
|
|
|
bool operator==(reverse_iterator other) const
|
|
{
|
|
return current == other.current;
|
|
}
|
|
|
|
bool operator!=(reverse_iterator other) const
|
|
{
|
|
return current != other.current;
|
|
}
|
|
|
|
std::pair<blt::size_t, const_reference> operator*() const
|
|
{
|
|
return {index, *current};
|
|
};
|
|
|
|
std::pair<blt::size_t, reference> operator*()
|
|
{
|
|
return {index, *current};
|
|
};
|
|
};
|
|
}
|
|
|
|
template<typename TYPE_ITR, template<typename> typename iterator = itr::iterator>
|
|
class enumerator
|
|
{
|
|
public:
|
|
explicit enumerator(TYPE_ITR begin, TYPE_ITR end): begin_(std::move(begin), 0), end_(std::move(end), 0)
|
|
{}
|
|
|
|
explicit enumerator(TYPE_ITR begin, TYPE_ITR end, blt::size_t i_begin, blt::size_t i_end):
|
|
begin_(std::move(begin), i_begin), end_(std::move(end), i_end)
|
|
{}
|
|
|
|
itr::iterator<TYPE_ITR> begin()
|
|
{
|
|
return begin_;
|
|
}
|
|
|
|
itr::iterator<TYPE_ITR> end()
|
|
{
|
|
return end_;
|
|
}
|
|
|
|
private:
|
|
iterator<TYPE_ITR> begin_;
|
|
iterator<TYPE_ITR> end_;
|
|
};
|
|
|
|
template<typename T>
|
|
static inline auto enumerate(const T& container)
|
|
{
|
|
return enumerator{container.begin(), container.end()};
|
|
}
|
|
|
|
template<typename T, blt::size_t size>
|
|
static inline auto enumerate(const T(& container)[size])
|
|
{
|
|
return enumerator{&container[0], &container[size]};
|
|
}
|
|
|
|
template<typename T, blt::size_t size>
|
|
static inline auto enumerate(T(& container)[size])
|
|
{
|
|
return enumerator{&container[0], &container[size]};
|
|
}
|
|
|
|
template<typename T>
|
|
static inline auto enumerate(T& container)
|
|
{
|
|
return enumerator{container.begin(), container.end()};
|
|
}
|
|
|
|
template<typename T>
|
|
static inline auto enumerate(T&& container)
|
|
{
|
|
return enumerator{container.begin(), container.end()};
|
|
}
|
|
|
|
template<typename Begin, typename End>
|
|
static inline auto iterate(Begin&& begin, End&& end)
|
|
{
|
|
return itr::itr_container<Begin, End>{std::forward<Begin>(begin), std::forward<End>(end)};
|
|
}
|
|
|
|
template<typename Begin, typename End>
|
|
static inline auto reverse_iterate(Begin&& begin, End&& end)
|
|
{
|
|
return itr::itr_container{std::reverse_iterator(std::forward<Begin>(end)), std::reverse_iterator(std::forward<End>(begin))};
|
|
}
|
|
|
|
template<typename T>
|
|
struct range
|
|
{
|
|
public:
|
|
struct range_itr
|
|
{
|
|
public:
|
|
using iterator_category = std::bidirectional_iterator_tag;
|
|
using difference_type = T;
|
|
using value_type = T;
|
|
using pointer = T*;
|
|
using reference = T&;
|
|
private:
|
|
T current;
|
|
bool forward;
|
|
public:
|
|
|
|
explicit range_itr(T current, bool forward): current(current), forward(forward)
|
|
{}
|
|
|
|
value_type operator*() const
|
|
{ return current; }
|
|
|
|
value_type operator->()
|
|
{ return current; }
|
|
|
|
range_itr& operator++()
|
|
{
|
|
if (forward)
|
|
current++;
|
|
else
|
|
current--;
|
|
return *this;
|
|
}
|
|
|
|
range_itr& operator--()
|
|
{
|
|
if (forward)
|
|
current--;
|
|
else
|
|
current++;
|
|
return *this;
|
|
}
|
|
|
|
friend bool operator==(const range_itr& a, const range_itr& b)
|
|
{
|
|
return a.current == b.current;
|
|
}
|
|
|
|
friend bool operator!=(const range_itr& a, const range_itr& b)
|
|
{
|
|
return a.current != b.current;
|
|
}
|
|
};
|
|
|
|
private:
|
|
T _begin;
|
|
T _end;
|
|
T offset = 0;
|
|
public:
|
|
range(T begin, T end): _begin(begin), _end(end), offset(end < begin ? 1 : 0)
|
|
{}
|
|
|
|
range_itr begin()
|
|
{
|
|
return range_itr(_begin - offset, offset == 0);
|
|
}
|
|
|
|
range_itr end()
|
|
{
|
|
// not sure if i like this
|
|
return range_itr(_end - offset, offset == 0);
|
|
}
|
|
};
|
|
|
|
template<typename I>
|
|
class itr_offset
|
|
{
|
|
private:
|
|
I begin_;
|
|
I end_;
|
|
public:
|
|
template<typename T>
|
|
itr_offset(I begin, I end, T offset): begin_(begin), end_(end)
|
|
{
|
|
for (T t = 0; t < offset; t++)
|
|
++begin_;
|
|
}
|
|
|
|
template<typename C, typename T>
|
|
itr_offset(C& container, T offset): begin_(container.begin()), end_(container.end())
|
|
{
|
|
for (T t = 0; t < offset; t++)
|
|
++begin_;
|
|
}
|
|
|
|
auto begin()
|
|
{
|
|
return begin_;
|
|
}
|
|
|
|
auto end()
|
|
{
|
|
return end_;
|
|
}
|
|
};
|
|
|
|
template<typename C, typename T>
|
|
itr_offset(C, T) -> itr_offset<typename C::iterator>;
|
|
|
|
inline constexpr std::size_t dynamic_extent = std::numeric_limits<std::size_t>::max();
|
|
|
|
template<typename T, std::size_t extent = dynamic_extent>
|
|
class span;
|
|
|
|
// https://codereview.stackexchange.com/questions/217814/c17-span-implementation
|
|
namespace span_detail
|
|
{
|
|
// detect specializations of span
|
|
template<class T>
|
|
struct is_span : std::false_type
|
|
{
|
|
};
|
|
|
|
template<class T, std::size_t N>
|
|
struct is_span<span<T, N>> : std::true_type
|
|
{
|
|
};
|
|
|
|
template<class T>
|
|
inline constexpr bool is_span_v = is_span<T>::value;
|
|
|
|
// detect specializations of std::array
|
|
template<class T>
|
|
struct is_array : std::false_type
|
|
{
|
|
};
|
|
|
|
template<class T, std::size_t N>
|
|
struct is_array<std::array<T, N>> : std::true_type
|
|
{
|
|
};
|
|
|
|
template<class T>
|
|
inline constexpr bool is_array_v = is_array<T>::value;
|
|
|
|
// detect container
|
|
template<class C, class = void>
|
|
struct is_cont : std::false_type
|
|
{
|
|
};
|
|
|
|
template<class C>
|
|
struct is_cont<C,
|
|
std::void_t<
|
|
std::enable_if_t<!is_span_v<C>>,
|
|
std::enable_if_t<!is_array_v<C>>,
|
|
std::enable_if_t<!std::is_array_v<C>>,
|
|
decltype(data(std::declval<C>())),
|
|
decltype(size(std::declval<C>()))
|
|
>> : std::true_type
|
|
{
|
|
};
|
|
|
|
template<class C>
|
|
inline constexpr bool is_cont_v = is_cont<C>::value;
|
|
}
|
|
|
|
template<typename T, std::size_t extent>
|
|
class span
|
|
{
|
|
public:
|
|
using element_type = T;
|
|
using value_type = std::remove_cv_t<T>;
|
|
using size_type = blt::size_t;
|
|
using difference_type = std::ptrdiff_t;
|
|
using pointer = T*;
|
|
using const_pointer = const T*;
|
|
using reference = T&;
|
|
using const_reference = const T&;
|
|
using iterator = T*;
|
|
using const_iterator = const T*;
|
|
using reverse_iterator = std::reverse_iterator<iterator>;
|
|
using const_reverse_iterator = std::reverse_iterator<const_iterator>;
|
|
private:
|
|
size_type size_;
|
|
pointer data_;
|
|
public:
|
|
constexpr span() noexcept: size_(0), data_(nullptr)
|
|
{}
|
|
|
|
constexpr span(T* data, size_type count): size_(count), data_(data)
|
|
{}
|
|
|
|
template<class It, std::size_t SIZE, typename std::enable_if_t<extent != dynamic_extent && SIZE == extent, bool> = true>
|
|
constexpr explicit span(It first, size_type count): size_(count), data_(&*first)
|
|
{}
|
|
|
|
template<class It, std::size_t SIZE, typename std::enable_if_t<extent == dynamic_extent && SIZE == extent, bool> = true>
|
|
constexpr span(It first, size_type count): size_(count), data_(&*first)
|
|
{}
|
|
|
|
template<class It, class End, std::size_t SIZE, typename std::enable_if_t<extent != dynamic_extent && SIZE == extent, bool> = true>
|
|
constexpr explicit span(It first, End last): size_(&*last - &*first), data_(&*first)
|
|
{}
|
|
|
|
template<class It, class End, std::size_t SIZE, typename std::enable_if_t<extent == dynamic_extent && SIZE == extent, bool> = true>
|
|
constexpr span(It first, End last): size_(&*last - &*first), data_(&*first)
|
|
{}
|
|
|
|
template<std::size_t N, typename std::enable_if_t<(N == dynamic_extent || N == extent) &&
|
|
(std::is_convertible_v<std::remove_pointer_t<decltype(
|
|
std::data(std::declval<T(&)[N]>()))>(*)[], T(*)[]>), bool> = true>
|
|
constexpr span(element_type (& arr)[N]) noexcept: size_{N}, data_{arr} // NOLINT
|
|
{}
|
|
|
|
template<class U, std::size_t N, typename std::enable_if_t<(N == dynamic_extent || N == extent) &&
|
|
(std::is_convertible_v<std::remove_pointer_t<decltype(
|
|
std::data(std::declval<T(&)[N]>()))>(*)[], T(*)[]>), bool> = true>
|
|
constexpr span(std::array<U, N>& arr) noexcept: size_(N), data_{arr.data()} // NOLINT
|
|
{}
|
|
|
|
template<class U, std::size_t N, typename std::enable_if_t<(N == dynamic_extent || N == extent) &&
|
|
(std::is_convertible_v<std::remove_pointer_t<decltype(
|
|
std::data(std::declval<T(&)[N]>()))>(*)[], T(*)[]>), bool> = true>
|
|
constexpr span(const std::array<U, N>& arr) noexcept: size_(N), data_{arr.data()} // NOLINT
|
|
{}
|
|
|
|
template<class R, class RCV = std::remove_cv_t<std::remove_reference_t<R>>, typename std::enable_if_t<
|
|
extent != dynamic_extent && span_detail::is_cont_v<RCV> &&
|
|
std::is_convertible_v<std::remove_pointer_t<decltype(std::data(std::declval<R>()))>(*)[], T(*)[]>, bool> = true>
|
|
explicit constexpr span(R&& range): size_(std::size(range)), data_(std::data(range))
|
|
{}
|
|
|
|
template<class R, class RCV = std::remove_cv_t<std::remove_reference_t<R>>, typename std::enable_if_t<
|
|
extent == dynamic_extent && span_detail::is_cont_v<RCV> &&
|
|
std::is_convertible_v<std::remove_pointer_t<decltype(std::data(std::declval<R>()))>(*)[], T(*)[]>, bool> = true>
|
|
constexpr span(R&& range): size_(std::size(range)), data_(std::data(range)) // NOLINT
|
|
{}
|
|
|
|
template<size_type SIZE, typename std::enable_if_t<
|
|
extent != dynamic_extent && SIZE == extent && std::is_const_v<element_type>, bool> = true>
|
|
explicit constexpr span(std::initializer_list<value_type> il) noexcept: size_(il.size()), data_(&il.begin()) // NOLINT
|
|
{}
|
|
|
|
template<size_type SIZE, typename std::enable_if_t<
|
|
extent == dynamic_extent && SIZE == extent && std::is_const_v<element_type>, bool> = true>
|
|
explicit span(std::initializer_list<value_type> il) noexcept: size_(il.size()), data_(&il.begin()) // NOLINT
|
|
{}
|
|
|
|
template<class U, std::size_t N, typename std::enable_if_t<
|
|
extent != dynamic_extent && N == dynamic_extent && std::is_convertible_v<U(*)[], T(*)[]>, bool> = true>
|
|
explicit constexpr span(const span<U, N>& source) noexcept: size_{source.size()}, data_{source.data()}
|
|
{}
|
|
|
|
template<class U, std::size_t N, typename std::enable_if_t<
|
|
!(extent != dynamic_extent && N == dynamic_extent) && std::is_convertible_v<U(*)[], T(*)[]>, bool> = true>
|
|
constexpr span(const span<U, N>& source) noexcept: size_{source.size()}, data_{source.data()} // NOLINT
|
|
{}
|
|
|
|
constexpr span& operator=(const span& copy)
|
|
{
|
|
size_ = copy.size();
|
|
data_ = copy.data();
|
|
return *this;
|
|
}
|
|
|
|
constexpr span(const span& other) noexcept = default;
|
|
|
|
constexpr iterator begin() const noexcept
|
|
{
|
|
return data();
|
|
}
|
|
|
|
constexpr iterator end() const noexcept
|
|
{
|
|
return data() + size();
|
|
}
|
|
|
|
constexpr const_iterator cbegin() const noexcept
|
|
{
|
|
return data();
|
|
}
|
|
|
|
constexpr const_iterator cend() const noexcept
|
|
{
|
|
return data() + size();
|
|
}
|
|
|
|
constexpr reverse_iterator rbegin() const noexcept
|
|
{
|
|
return reverse_iterator{end()};
|
|
}
|
|
|
|
constexpr reverse_iterator rend() const noexcept
|
|
{
|
|
return reverse_iterator{begin()};
|
|
}
|
|
|
|
constexpr const_reverse_iterator crbegin() const noexcept
|
|
{
|
|
return reverse_iterator{cend()};
|
|
}
|
|
|
|
constexpr const_reverse_iterator crend() const noexcept
|
|
{
|
|
return reverse_iterator{cbegin()};
|
|
}
|
|
|
|
friend constexpr iterator begin(span s) noexcept
|
|
{
|
|
return s.begin();
|
|
}
|
|
|
|
friend constexpr iterator end(span s) noexcept
|
|
{
|
|
return s.end();
|
|
}
|
|
|
|
[[nodiscard]] constexpr size_type size() const noexcept
|
|
{
|
|
return size_;
|
|
}
|
|
|
|
[[nodiscard]] constexpr size_type size_bytes() const noexcept
|
|
{
|
|
return size() * sizeof(T);
|
|
}
|
|
|
|
[[nodiscard]] constexpr bool empty() const noexcept
|
|
{
|
|
return size() == 0;
|
|
}
|
|
|
|
constexpr reference operator[](size_type idx) const
|
|
{
|
|
return *(data() + idx);
|
|
}
|
|
|
|
constexpr reference front() const
|
|
{
|
|
return *data();
|
|
}
|
|
|
|
constexpr reference back() const
|
|
{
|
|
return *(data() + (size() - 1));
|
|
}
|
|
|
|
constexpr pointer data() const noexcept
|
|
{
|
|
return data_;
|
|
}
|
|
|
|
constexpr span<T, dynamic_extent> first(size_type cnt) const
|
|
{
|
|
return {data(), cnt};
|
|
}
|
|
|
|
constexpr span<T, dynamic_extent> last(size_type cnt) const
|
|
{
|
|
return {data() + (size() - cnt), cnt};
|
|
}
|
|
|
|
constexpr span<T, dynamic_extent> subspan(size_type off, size_type cnt = dynamic_extent) const
|
|
{
|
|
return {data() + off, cnt == dynamic_extent ? size() - off : cnt};
|
|
}
|
|
|
|
};
|
|
|
|
template<class T, std::size_t N>
|
|
span(T (&)[N]) -> span<T, N>;
|
|
|
|
template<class T, std::size_t N>
|
|
span(std::array<T, N>&) -> span<T, N>;
|
|
|
|
template<class T, std::size_t N>
|
|
span(const std::array<T, N>&) -> span<const T, N>;
|
|
|
|
template<class Cont>
|
|
span(Cont&) -> span<typename Cont::value_type>;
|
|
|
|
template<class Cont>
|
|
span(const Cont&) -> span<const typename Cont::value_type>;
|
|
}
|
|
|
|
#endif //BLT_RANGES_H
|