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Merge pull request #12087 from KratosMultiphysics/core/pointer_vector…
…_set/introduce_insert [Core] Introducing proper insert method to PointerVectorSet
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| // | / | | ||
| // ' / __| _` | __| _ \ __| | ||
| // . \ | ( | | ( |\__ ` | ||
| // _|\_\_| \__,_|\__|\___/ ____/ | ||
| // Multi-Physics | ||
| // | ||
| // License: BSD License | ||
| // Kratos default license: kratos/license.txt | ||
| // | ||
| // Main authors: Suneth Warnakulasuriya | ||
| // | ||
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| #pragma once | ||
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| // System includes | ||
| #include <functional> | ||
| #include <type_traits> | ||
| #include <utility> | ||
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| // External includes | ||
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| // Project includes | ||
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| namespace Kratos | ||
| { | ||
| ///@name Kratos Classes | ||
| ///@{ | ||
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| /** | ||
| * @class TestOperators | ||
| * @brief Operator class to test whether operators "<" and "==" is defined for given TDataType. | ||
| */ | ||
| struct TestOperators | ||
| { | ||
| template<class TDataType> | ||
| static auto TestEqual(TDataType*) -> decltype(std::declval<TDataType>() == std::declval<TDataType>()); | ||
| template<typename> | ||
| static auto TestEqual(...) -> std::false_type; | ||
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| template<class TDataType> | ||
| static auto TestLess(TDataType*) -> decltype(std::declval<TDataType>() < std::declval<TDataType>()); | ||
| template<typename> | ||
| static auto TestLess(...) -> std::false_type; | ||
| }; | ||
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| /** | ||
| * @class KeyGenerator | ||
| * @brief A functor that serves as the identity function if "<" and "==" operators are defined, otherwise, returns memory location. | ||
| * @details This class provides two overloaded operator() functions, one for non-const objects | ||
| * and another for const objects. The operator() returns the input objects memory location as it is, | ||
| * effectively acting as an identity function for address if the operators "<" and "==" is not defined. Otherwise, | ||
| * this returns the exact input object. | ||
| * | ||
| * The purpose of this functor is to allow objects' memory locations or exact object to be used as keys in sets or other | ||
| * containers that require comparison. By using this functor, you can avoid defining | ||
| * custom comparison functions or operators when the object itself can be considered | ||
| * for comparison. | ||
| * @tparam TDataType The data type of the object that the functor operates on. | ||
| * @author Suneth Warnakulasuriya | ||
| */ | ||
| template<class TDataType> | ||
| class KeyGenerator | ||
| { | ||
| private: | ||
| ///@name Private static variables | ||
| ///@{ | ||
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| static constexpr bool HasOperatorEqual = std::is_same_v<bool, decltype(TestOperators::TestEqual<TDataType>(0))>; | ||
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| static constexpr bool HasOperatorLess = std::is_same_v<bool, decltype(TestOperators::TestLess<TDataType>(0))>; | ||
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| static constexpr bool HasOperatorsDefined = HasOperatorEqual && HasOperatorLess; | ||
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| ///@} | ||
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| public: | ||
| ///@name Public operators | ||
| ///@{ | ||
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| /** | ||
| * @brief Operator that returns a non-const reference to the input object if "<" and "==" operators are defined. | ||
| * Otherwise this returns a pointer to the input object. | ||
| * @param data The input object of type TDataType. | ||
| * @return A non-const reference or pointer to the same object as provided in the parameter. | ||
| */ | ||
| std::conditional_t<HasOperatorsDefined, TDataType&, TDataType*> operator()(TDataType& rData) | ||
| { | ||
| if constexpr(HasOperatorsDefined) { | ||
| return rData; | ||
| } else { | ||
| return &rData; | ||
| } | ||
| } | ||
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| /** | ||
| * @brief Operator that returns a const reference to the input object if "<" and "==" operators are defined. | ||
| * Otherwise this returns a pointer to the const input object. | ||
| * @param data The input object of type TDataType. | ||
| * @return A const reference or pointer to the same object as provided in the parameter. | ||
| */ | ||
| std::conditional_t<HasOperatorsDefined, TDataType const&, TDataType const*> operator()(const TDataType& rData) const | ||
| { | ||
| if constexpr(HasOperatorsDefined) { | ||
| return rData; | ||
| } else { | ||
| return &rData; | ||
| } | ||
| } | ||
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| ///@} | ||
| }; | ||
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| ///@} | ||
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| } // namespace Kratos. |
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