view.hpp

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#ifndef EAGINE_VECT_VIEW_HPP
#define EAGINE_VECT_VIEW_HPP
 
#include "../span.hpp"
#include "data.hpp"
 
namespace eagine::vect {
 
template <typename T, int N, bool V>
struct view {
private:
    static auto _addr(const data_t<T, N, V>& d, std::false_type) noexcept
      -> const T* {
        return static_cast<const T*>(d._v);
    }
 
    static auto _addr(const data_t<T, N, V>& d, std::true_type) noexcept
      -> const T* {
        // TODO: strict aliasing, launder?
        return reinterpret_cast<const T*>(&d);
    }
 
public:
    static auto apply(const data_t<T, N, V>& d) noexcept -> span<const T> {
        static_assert(sizeof(T[N]) == sizeof(data_t<T, N, V>));
        return {_addr(d, has_vect_data<T, N, V>()), N};
    }
 
    template <int M>
    static auto apply(const data_t<T, N, V> (&d)[M]) noexcept -> span<const T> {
        static_assert(sizeof(T[N][M]) == sizeof(data_t<T, N, V>[M]));
        return {_addr(d[0], has_vect_data<T, N, V>()), N * M};
    }
};
 
} // namespace eagine::vect
 
#endif // EAGINE_VECT_VIEW_HPP