propertysystem.hh

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// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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#ifndef DUMUX_PROPERTY_SYSTEM_HH
#define DUMUX_PROPERTY_SYSTEM_HH
 
#include <tuple>
#include <type_traits>
 
namespace Dumux::Properties {
 
struct UndefinedProperty {};
 
} // end namespace Dumux::Properties
 
namespace Dumux::Properties::Detail {
 
template<class P>
constexpr auto isDefinedProperty(int)
-> decltype(std::integral_constant<bool, !std::is_same_v<typename P::type, UndefinedProperty>>{})
{ return {}; }
 
template<class P>
constexpr std::true_type isDefinedProperty(...) { return {}; }
 
template<class T>
constexpr auto hasParentTypeTag(int)
-> decltype(std::declval<typename T::InheritsFrom>(), std::true_type{})
{ return {}; }
 
template<class T>
constexpr std::false_type hasParentTypeTag(...)
{ return {}; }
 
template<class ...Tuples>
using ConCatTuples = decltype(std::tuple_cat(std::declval<Tuples>()...));
 
template<class TypeTag, template<class,class> class Property, class TTagList>
struct GetDefined;
 
template<class TypeTag, template<class,class> class Property, class TTagList, class Enable>
struct GetNextTypeTag;
 
template<class TypeTag, template<class,class> class Property, class LastTypeTag>
struct GetNextTypeTag<TypeTag, Property, std::tuple<LastTypeTag>, std::enable_if_t<hasParentTypeTag<LastTypeTag>(int{}), void>>
{ using type = typename GetDefined<TypeTag, Property, typename LastTypeTag::InheritsFrom>::type; };
 
template<class TypeTag, template<class,class> class Property, class LastTypeTag>
struct GetNextTypeTag<TypeTag, Property, std::tuple<LastTypeTag>, std::enable_if_t<!hasParentTypeTag<LastTypeTag>(int{}), void>>
{ using type = UndefinedProperty; };
 
template<class TypeTag, template<class,class> class Property, class FirstTypeTag, class ...Args>
struct GetNextTypeTag<TypeTag, Property, std::tuple<FirstTypeTag, Args...>, std::enable_if_t<hasParentTypeTag<FirstTypeTag>(int{}), void>>
{ using type = typename GetDefined<TypeTag, Property, ConCatTuples<typename FirstTypeTag::InheritsFrom, std::tuple<Args...>>>::type; };
 
template<class TypeTag, template<class,class> class Property, class FirstTypeTag, class ...Args>
struct GetNextTypeTag<TypeTag, Property, std::tuple<FirstTypeTag, Args...>, std::enable_if_t<!hasParentTypeTag<FirstTypeTag>(int{}), void>>
{ using type = typename GetDefined<TypeTag, Property, std::tuple<Args...>>::type; };
 
template<class TypeTag, template<class,class> class Property, class LastTypeTag>
struct GetDefined<TypeTag, Property, std::tuple<LastTypeTag>>
{
// For clang, the following alias triggers compiler warnings if instantiated
// from something like `GetPropType<..., DeprecatedProperty>`, even if that is
// contained in a diagnostic pragma construct that should prevent these warnings.
// As a workaround, also add the pragmas around this line.
// See the discussion in MR 1647 for more details.
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
#endif
     using LastType = Property<TypeTag, LastTypeTag>;
#ifdef __clang__
#pragma clang diagnostic pop
#endif
     using type = std::conditional_t<isDefinedProperty<LastType>(int{}), LastType,
                                     typename GetNextTypeTag<TypeTag, Property, std::tuple<LastTypeTag>, void>::type>;
};
 
template<class TypeTag, template<class,class> class Property, class FirstTypeTag, class ...Args>
struct GetDefined<TypeTag, Property, std::tuple<FirstTypeTag, Args...>>
{
// See the comment above.
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
#endif
     using FirstType = Property<TypeTag, FirstTypeTag>;
#ifdef __clang__
#pragma clang diagnostic pop
#endif
     using type = std::conditional_t<isDefinedProperty<FirstType>(int{}), FirstType,
                                     typename GetNextTypeTag<TypeTag, Property, std::tuple<FirstTypeTag, Args...>, void>::type>;
};
 
template<class TypeTag, template<class,class> class Property>
struct GetPropImpl
{
    using type = typename Detail::GetDefined<TypeTag, Property, std::tuple<TypeTag>>::type;
    static_assert(!std::is_same<type, UndefinedProperty>::value, "Property is undefined!");
};
 
} // end namespace Dumux::Properties::Detail
 
namespace Dumux {
 
template<class TypeTag, template<class,class> class Property>
using GetProp = typename Properties::Detail::GetPropImpl<TypeTag, Property>::type;
 
// See the comment above.
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
#endif
template<class TypeTag, template<class,class> class Property>
using GetPropType = typename Properties::Detail::GetPropImpl<TypeTag, Property>::type::type;
 
template<class TypeTag, template<class,class> class Property>
constexpr auto getPropValue() { return Properties::Detail::GetPropImpl<TypeTag, Property>::type::value; }
#ifdef __clang__
#pragma clang diagnostic pop
#endif
 
} // end namespace Dumux
 
#endif