/usr/include/dune/common/typelist.hh is in libdune-common-dev 2.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#ifndef DUNE_COMMON_TYPELIST_HH
#define DUNE_COMMON_TYPELIST_HH
#include <type_traits>
#include <tuple>
namespace Dune {
/**
* \brief A simple type list
*
* \ingroup TypeUtilities
*
* The purpose of this is to encapsulate a list of types.
* This allows, e.g., to pack an argument-pack into one type.
* In contrast to a std::tuple a TypeList can be created
* without creating any object of the stored types.
*
* This can, e.g., be used for overload resolution
* with tag-dispatch where TypeList is used as tag.
* In combination with PriorityTag this allows to emulate
* partial specialization of function templates in
* a sane way, i.e., without the hassle of classic
* specialization of function templates
*/
template<class... T>
struct TypeList
{};
/**
* \brief Check if given type is a TypeList
*
* \ingroup TypeUtilities
*
* The result of the check is encoded in the
* base class of type std::integral_constant<bool, result>.
*/
template<class T>
struct IsTypeList : std::false_type {};
/**
* \copydoc IsTypeList
*
* \ingroup TypeUtilities
*/
template<class... T>
struct IsTypeList<TypeList<T...> > : std::true_type {};
/**
* \brief Check if given type is an empty TypeList
*
* \ingroup TypeUtilities
*
* The result of the check is encoded in the
* base class of type std::integral_constant<bool, result>.
*/
template<class T>
struct IsEmptyTypeList : std::integral_constant<bool, IsTypeList<T>() and std::is_same<T, TypeList<> >() > {};
template<class T>
struct TypeListSize {};
/**
* \brief Get size of TypeList
*
* \ingroup TypeUtilities
*
* The result of is encoded in the base class of
* type std::integral_constant<std::size_t, result>.
*/
template<class... T>
struct TypeListSize<TypeList<T...>> : std::integral_constant<std::size_t, sizeof...(T)> {};
template<std::size_t i, class T>
struct TypeListElement {};
/**
* \brief Get element of TypeList
*
* \ingroup TypeUtilities
*/
template<std::size_t i, class... T>
struct TypeListElement<i, TypeList<T...>>
{
/**
* \brief Export type of i-th element in TypeList
*
* \todo Implement without using std::tuple.
*/
using type = typename std::tuple_element<i, std::tuple<T...>>::type;
/**
* \brief Export type of i-th element in TypeList
*
* \todo Implement without using std::tuple.
*/
using Type = type;
};
/**
* \brief Shortcut for TypeListElement<i, T>::type;
*/
template<std::size_t i, class T>
using TypeListEntry_t = typename TypeListElement<i, T>::type;
} // namespace Dune
#endif // DUNE_COMMON_TYPELIST_HH
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