vec3_span.hpp

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#pragma once

 
#include <span>
#include <type_traits>
 
#include "orrery/core/types.hpp"
#include "orrery/core/vec3.hpp"
 
namespace orrery::core {

template<typename T> struct Vec3Span {
    static_assert(std::is_same_v<std::remove_const_t<T>, Real>,
                  "A Vec3Span views component arrays, which hold Real");
 
    std::span<T> x;
    std::span<T> y;
    std::span<T> z;

    [[nodiscard]] constexpr Index size() const noexcept { return x.size(); }
 
    [[nodiscard]] constexpr bool empty() const noexcept { return x.empty(); }

    [[nodiscard]] constexpr Vec3 get(Index index) const noexcept {
        return {x[index], y[index], z[index]};
    }

    constexpr void set(Index index, Vec3 value) const noexcept
        requires(!std::is_const_v<T>)
    {
        x[index] = value.x;
        y[index] = value.y;
        z[index] = value.z;
    }

    constexpr operator Vec3Span<const T>() const noexcept
        requires(!std::is_const_v<T>)
    {
        return {x, y, z};
    }
};
 
} // namespace orrery::core