sarray_impl.h

#pragma once
#include "gaia/config/config.h"
 
#include <cstddef>
#include <tuple>
#include <type_traits>
#include <utility>
 
#include "gaia/core/iterator.h"
#include "gaia/core/utility.h"
#include "gaia/mem/data_layout_policy.h"
 
namespace gaia {
  namespace cnt {
    namespace sarr_detail {
      using difference_type = uint32_t;
      using size_type = uint32_t;
    } // namespace sarr_detail
 
    template <typename T, sarr_detail::size_type N>
    class sarr {
    public:
      static_assert(N > 0);
 
      using value_type = T;
      using reference = T&;
      using const_reference = const T&;
      using pointer = T*;
      using const_pointer = const T*;
      using view_policy = mem::data_view_policy_aos<T>;
      using difference_type = sarr_detail::difference_type;
      using size_type = sarr_detail::size_type;
 
      using iterator = pointer;
      using const_iterator = const_pointer;
      using iterator_category = core::random_access_iterator_tag;
 
      static constexpr size_t value_size = sizeof(T);
      static constexpr size_type extent = N;
 
      T m_data[N];
 
      constexpr sarr() noexcept = default;
 
      constexpr sarr(core::zero_t) noexcept {
        for (auto i = (size_type)0; i < extent; ++i)
          m_data[i] = {};
      }
 
      GAIA_CONSTEXPR_DTOR ~sarr() = default;
 
      template <typename InputIt>
      constexpr sarr(InputIt first, InputIt last) noexcept: sarr() {
        const auto count = (size_type)core::distance(first, last);
 
        if constexpr (std::is_pointer_v<InputIt>) {
          for (size_type i = 0; i < count; ++i)
            operator[](i) = first[i];
        } else if constexpr (std::is_same_v<typename InputIt::iterator_category, core::random_access_iterator_tag>) {
          for (size_type i = 0; i < count; ++i)
            operator[](i) = *(first[i]);
        } else {
          size_type i = 0;
          for (auto it = first; it != last; ++it)
            operator[](++i) = *it;
        }
      }
 
      constexpr sarr(std::initializer_list<T> il): sarr(il.begin(), il.end()) {}
 
      constexpr sarr(const sarr& other) = default;
 
      constexpr sarr(sarr&& other) noexcept = default;
 
      sarr& operator=(std::initializer_list<T> il) {
        *this = sarr(il.begin(), il.end());
        return *this;
      }
 
      constexpr sarr& operator=(const sarr& other) {
        GAIA_ASSERT(core::addressof(other) != this);
 
        for (size_type i = 0; i < extent; ++i)
          m_data[i] = other.m_data[i];
 
        return *this;
      }
 
      constexpr sarr& operator=(sarr&& other) noexcept {
        GAIA_ASSERT(core::addressof(other) != this);
 
        for (size_type i = 0; i < extent; ++i)
          m_data[i] = GAIA_MOV(other.m_data[i]);
 
        return *this;
      }
 
      GAIA_CLANG_WARNING_PUSH()
      // Memory is aligned so we can silence this warning
      GAIA_CLANG_WARNING_DISABLE("-Wcast-align")
 
      GAIA_NODISCARD constexpr pointer data() noexcept {
        return &m_data[0];
      }
 
      GAIA_NODISCARD constexpr const_pointer data() const noexcept {
        return &m_data[0];
      }
 
      GAIA_NODISCARD constexpr decltype(auto) operator[](size_type pos) noexcept {
        GAIA_ASSERT(pos < size());
        return m_data[pos];
      }
 
      GAIA_NODISCARD constexpr decltype(auto) operator[](size_type pos) const noexcept {
        GAIA_ASSERT(pos < size());
        return m_data[pos];
      }
 
      GAIA_CLANG_WARNING_POP()
 
      GAIA_NODISCARD constexpr size_type size() const noexcept {
        return N;
      }
 
      GAIA_NODISCARD constexpr bool empty() const noexcept {
        return false;
      }
 
      GAIA_NODISCARD constexpr size_type capacity() const noexcept {
        return N;
      }
 
      GAIA_NODISCARD constexpr size_type max_size() const noexcept {
        return N;
      }
 
      GAIA_NODISCARD constexpr decltype(auto) front() noexcept {
        return (reference)*begin();
      }
 
      GAIA_NODISCARD constexpr decltype(auto) front() const noexcept {
        return (const_reference)*begin();
      }
 
      GAIA_NODISCARD constexpr decltype(auto) back() noexcept {
        return (reference) operator[](N - 1);
      }
 
      GAIA_NODISCARD constexpr decltype(auto) back() const noexcept {
        return (const_reference) operator[](N - 1);
      }
 
      GAIA_NODISCARD constexpr auto begin() noexcept {
        return iterator(&m_data[0]);
      }
 
      GAIA_NODISCARD constexpr auto begin() const noexcept {
        return const_iterator(&m_data[0]);
      }
 
      GAIA_NODISCARD constexpr auto cbegin() const noexcept {
        return const_iterator(&m_data[0]);
      }
 
      GAIA_NODISCARD constexpr auto rbegin() noexcept {
        return iterator((pointer)&back());
      }
 
      GAIA_NODISCARD constexpr auto rbegin() const noexcept {
        return const_iterator((const_pointer)&back());
      }
 
      GAIA_NODISCARD constexpr auto crbegin() const noexcept {
        return const_iterator((const_pointer)&back());
      }
 
      GAIA_NODISCARD constexpr auto end() noexcept {
        return iterator(&m_data[0] + size());
      }
 
      GAIA_NODISCARD constexpr auto end() const noexcept {
        return const_iterator(&m_data[0] + size());
      }
 
      GAIA_NODISCARD constexpr auto cend() const noexcept {
        return const_iterator(&m_data[0] + size());
      }
 
      GAIA_NODISCARD constexpr auto rend() noexcept {
        return iterator(&m_data[0] - 1);
      }
 
      GAIA_NODISCARD constexpr auto rend() const noexcept {
        return const_iterator(&m_data[0] - 1);
      }
 
      GAIA_NODISCARD constexpr auto crend() const noexcept {
        return const_iterator(&m_data[0] - 1);
      }
 
      GAIA_NODISCARD constexpr bool operator==(const sarr& other) const {
        for (size_type i = 0; i < N; ++i)
          if (!(operator[](i) == other[i]))
            return false;
        return true;
      }
 
      GAIA_NODISCARD constexpr bool operator!=(const sarr& other) const {
        return !operator==(other);
      }
    };
 
    namespace detail {
      template <typename T, uint32_t N, uint32_t... I>
      constexpr sarr<std::remove_cv_t<T>, N> to_array_impl(T (&a)[N], std::index_sequence<I...> /*no_name*/) {
        return {{a[I]...}};
      }
    } // namespace detail
 
    template <typename T, uint32_t N>
    constexpr sarr<std::remove_cv_t<T>, N> to_array(T (&a)[N]) {
      return detail::to_array_impl(a, std::make_index_sequence<N>{});
    }
 
    template <typename T, typename... U>
    sarr(T, U...) -> sarr<T, 1 + (uint32_t)sizeof...(U)>;
 
  } // namespace cnt
} // namespace gaia
 
namespace std {
  template <typename T, uint32_t N>
  struct tuple_size<gaia::cnt::sarr<T, N>>: std::integral_constant<uint32_t, N> {};
 
  template <size_t I, typename T, uint32_t N>
  struct tuple_element<I, gaia::cnt::sarr<T, N>> {
    using type = T;
  };
} // namespace std