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#pragma once
#include "tile.hpp"
#include <type_traits>
#include <array>
namespace Magnum::Examples {
template<typename F, typename Tile>
concept tile_iterator = requires(F fn, Tile& tile) {
{ fn.operator()(tile, std::size_t{}, local_coords{}) } -> std::same_as<void>;
};
struct chunk final
{
constexpr tile& operator[](local_coords xy) { return _tiles[xy.to_index()]; }
constexpr const tile& operator[](local_coords xy) const { return _tiles[xy.to_index()]; }
constexpr tile& operator[](std::size_t i) { return _tiles[i]; }
constexpr const tile& operator[](std::size_t i) const { return _tiles[i]; }
const auto& tiles() const { return _tiles; }
auto& tiles() { return _tiles; }
template<tile_iterator<tile&> F>
constexpr inline void foreach_tile(F&& fun) {
foreach_tile_<F, chunk&>(std::forward<F>(fun));
}
template<tile_iterator<const tile&> F>
constexpr inline void foreach_const_tile(F&& fun) const {
const_cast<chunk*>(this)->foreach_tile_<F, const chunk&>(std::forward<F>(fun));
}
private:
template<typename F, typename Self>
constexpr void foreach_tile_(F&& fun);
std::array<tile, TILE_COUNT> _tiles = {};
};
template<typename F, typename Self>
constexpr void chunk::foreach_tile_(F&& fun)
{
constexpr auto N = TILE_MAX_DIM;
std::size_t k = 0;
for (std::size_t j = 0; j < N; j++)
for (std::size_t i = 0; i < N; i++, k++)
fun(const_cast<Self>(*this)._tiles[k], k,
local_coords{(std::uint8_t)i, (std::uint8_t)j});
}
} // namespace Magnum::Examples
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