finiteelements/mechanics/materials/hyperelastic/concepts.hh

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// SPDX-FileCopyrightText: 2021-2025 The Ikarus Developers mueller@ibb.uni-stuttgart.de
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#pragma once
 
#include <concepts>
#include <string>
 
#include <ikarus/utils/concepts.hh>
 
namespace Ikarus::Concepts {
 
template <typename DF>
concept DeviatoricFunction = requires(DF dm, const typename DF::template PrincipalStretches<>& lambda) {
  typename DF::ScalarType;
 
  typename DF::template PrincipalStretches<>;
  typename DF::template FirstDerivative<>;
  typename DF::template SecondDerivative<>;
 
  typename DF::MaterialParameters;
 
  requires Concepts::EigenVector<typename DF::template FirstDerivative<>>;
  requires Concepts::EigenMatrix<typename DF::template SecondDerivative<>>;
  requires std::is_same_v<typename DF::template PrincipalStretches<>, typename DF::template FirstDerivative<>>;
 
  { dm.storedEnergyImpl(lambda) } -> std::same_as<typename DF::ScalarType>;
  { dm.firstDerivativeImpl(lambda) } -> std::same_as<typename DF::template FirstDerivative<>>;
  { dm.secondDerivativeImpl(lambda) } -> std::same_as<typename DF::template SecondDerivative<>>;
  { dm.materialParametersImpl() } -> std::same_as<typename DF::MaterialParameters>;
  { dm.name() } -> std::convertible_to<std::string>;
};
 
template <typename VF>
concept VolumetricFunction = requires(VF vf, const double& j) {
  { vf.storedEnergyImpl(j) } -> std::same_as<double>;
  { vf.firstDerivativeImpl(j) } -> std::same_as<double>;
  { vf.secondDerivativeImpl(j) } -> std::same_as<double>;
  { vf.name() } -> std::convertible_to<std::string>;
};
 
} // namespace Ikarus::Concepts