identity.hpp

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// Copyright Take Vos 2021.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "matrix.hpp"
 
namespace hi { inline namespace v1 {
namespace geo {
 
class identity {
public:
    constexpr identity(identity const&) noexcept = default;
    constexpr identity(identity&&) noexcept = default;
    constexpr identity& operator=(identity const&) noexcept = default;
    constexpr identity& operator=(identity&&) noexcept = default;
 
    constexpr identity() noexcept = default;
 
    template<int E>
    constexpr operator matrix<E>() const noexcept
    {
        return matrix<E>();
    }
 
    [[nodiscard]] identity operator~() const noexcept
    {
        return {};
    }
 
    template<typename O, int E>
    [[nodiscard]] constexpr vector<O, E> operator*(vector<O, E> const& rhs) const noexcept
    {
        return rhs;
    }
 
    template<typename O, int E>
    [[nodiscard]] constexpr point<O, E> operator*(point<O, E> const& rhs) const noexcept
    {
        return rhs;
    }
 
    template<typename O>
    [[nodiscard]] constexpr axis_aligned_rectangle<O> operator*(axis_aligned_rectangle<O> const& rhs) const noexcept
    {
        return rhs;
    }
 
    [[nodiscard]] constexpr rectangle operator*(rectangle const& rhs) const noexcept
    {
        return rhs;
    }
 
    template<int E>
    [[nodiscard]] constexpr identity operator*(identity const&) const noexcept
    {
        return {};
    }
 
    [[nodiscard]] constexpr bool is_valid() const noexcept
    {
        return true;
    }
};
 
} // namespace geo
 
using identity2 = geo::identity;
 
using identity3 = geo::identity;
 
}} // namespace hi::v1