segment.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
 *                                                                           *
 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * All rights reserved.                                                      *
 *                                                                           *
 * This program is free software; you can redistribute it and/or modify      *
 * it under the terms of the Mozilla Public License Version 2.0 as published *
 * by the Mozilla Foundation; either version 2 of the License, or            *
 * (at your option) any later version.                                       *
 *                                                                           *
 * This program is distributed in the hope that it will be useful,           *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of            *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_CONCEPTS_SPACE_SEGMENT_H
#define VCL_CONCEPTS_SPACE_SEGMENT_H
 
#include "point.h"
 
namespace vcl {
 
template<typename T>
concept SegmentConcept = requires (
    T&&                               obj,
    typename RemoveRef<T>::PointType  p,
    typename RemoveRef<T>::ScalarType s) {
    typename RemoveRef<T>::PointType;
    typename RemoveRef<T>::ScalarType;
 
    obj.DIM;
 
    RemoveRef<T>();
    RemoveRef<T>(p, p);
 
    { obj.p0() } -> PointConcept;
    { obj.p1() } -> PointConcept;
 
    { obj.midPoint() } -> PointConcept;
    { obj.direction() } -> PointConcept;
    { obj.normalizedDirection() } -> PointConcept;
    { obj.length() } -> std::same_as<decltype(s)>;
    { obj.squaredLength() } -> std::same_as<decltype(s)>;
 
    { obj == obj } -> std::same_as<bool>;
    { obj != obj } -> std::same_as<bool>;
 
    { obj + obj } -> std::convertible_to<RemoveRef<T>>;
    { obj - obj } -> std::convertible_to<RemoveRef<T>>;
    { obj* s } -> std::convertible_to<RemoveRef<T>>;
    { obj / s } -> std::convertible_to<RemoveRef<T>>;
 
    // non const requirements
    requires IsConst<T> || requires {
        { obj.flip() } -> std::same_as<void>;
 
        { obj = obj } -> std::same_as<T&>;
 
        { obj += obj } -> std::same_as<T&>;
        { obj -= obj } -> std::same_as<T&>;
        { obj *= s } -> std::same_as<T&>;
        { obj /= s } -> std::same_as<T&>;
    };
};
 
template<typename T>
concept Segment2Concept = SegmentConcept<T> && RemoveRef<T>::DIM == 2;
 
template<typename T>
concept Segment3Concept = SegmentConcept<T> && RemoveRef<T>::DIM == 3;
 
} // namespace vcl
 
#endif // VCL_CONCEPTS_SPACE_SEGMENT_H