PolymorphicGeometry.hpp

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// Copyright (c) 2018 Maikel Nadolski
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
 
#ifndef FUB_GEOMETRY_POLYMORPHIC_GEOMETRY_HPP
#define FUB_GEOMETRY_POLYMORPHIC_GEOMETRY_HPP
 
#include "fub/core/type_traits.hpp"
#include "fub/geometry/Geometry.hpp"
 
#include <memory>
 
namespace fub {
 
template <std::size_t Rank, typename G>
struct GeometryWrapper : Geometry<Rank> {
  GeometryWrapper(const G& base) : base_{base} {}       // NOLINT
  GeometryWrapper(G&& base) : base_{std::move(base)} {} // NOLINT
 
  std::unique_ptr<Geometry<Rank>> Clone() const override {
    return std::make_unique<GeometryWrapper>(base_);
  }
 
  double ComputeDistanceTo(const std::array<double, Rank>& x) const override {
    return base_.ComputeDistanceTo(x);
  }
 
  G base_;
};
 
template <std::size_t Rank> class PolymorphicGeometry : public Geometry<Rank> {
public:
  PolymorphicGeometry(const PolymorphicGeometry& other)
      : base_{other.Clone()} {}
 
  template <
      typename G,
      std::enable_if_t<!std::is_base_of<Geometry<Rank>, G>::value>* = nullptr,
      std::enable_if_t<!std::is_same<G, PolymorphicGeometry>::value>* = nullptr>
  PolymorphicGeometry(const G& geometry)
      : base_{std::make_unique<GeometryWrapper<Rank, G>>(geometry)} {}
 
  template <
      typename G,
      std::enable_if_t<std::is_base_of<Geometry<Rank>, G>::value>* = nullptr,
      std::enable_if_t<!std::is_same<G, PolymorphicGeometry>::value>* = nullptr>
  PolymorphicGeometry(const G& geometry)
      : base_{std::make_unique<G>(geometry)} {}
 
  double ComputeDistanceTo(const std::array<double, Rank>& x) const override {
    return base_->ComputeDistanceTo(x);
  }
 
  std::unique_ptr<Geometry<Rank>> Clone() const override {
    return base_->Clone();
  }
 
  Geometry<Rank>& Base() noexcept { return *base_; }
  const Geometry<Rank>& Base() const noexcept { return *base_; }
 
private:
  std::unique_ptr<Geometry<Rank>> base_;
};
 
} // namespace fub
 
#endif