/usr/include/dune/functions/functionspacebases/flatmultiindex.hh is in libdune-functions-dev 2.5.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_FUNCTIONS_FUNCTIONSPACEBASES_FLATMULTIINDEX_HH
#define DUNE_FUNCTIONS_FUNCTIONSPACEBASES_FLATMULTIINDEX_HH
#include <array>
#include <dune/common/hash.hh>
namespace Dune {
namespace Functions {
/**
* \brief A multi index class with only one level
*
* This only adds a cast to size_type to std::array<size_type,1>.
* Hence MultiIndices of type FlatMultiIndex can be used like
* classic indices.
*/
template<class size_type>
class FlatMultiIndex :
public std::array<size_type,1>
{
public:
/**
* \brief Forward constructor arguments to std::array
*/
template<class... T>
constexpr FlatMultiIndex(T&&... t) :
std::array<size_type,1>(t...)
{}
/**
* \brief Construct from initializer_list
*
* This is needed because std::array does not have
* a constructor from initializer list. Instead
* the list initialization of an std::array is
* an aggregate initialization and hence not
* visible in the derived class.
*/
FlatMultiIndex(std::initializer_list<size_type> const &l) :
std::array<size_type,1>{{*l.begin()}}
{}
operator const size_type& () const
{
return this->operator[](0);
}
operator size_type& ()
{
return this->operator[](0);
}
inline friend std::size_t hash_value(const FlatMultiIndex& arg)
{
return std::hash<size_type>()(arg);
}
};
} // end namespace Functions
} // end namespace Dune
DUNE_DEFINE_HASH(DUNE_HASH_TEMPLATE_ARGS(typename size_type),DUNE_HASH_TYPE(Dune::Functions::FlatMultiIndex<size_type>))
#endif // DUNE_FUNCTIONS_FUNCTIONSPACEBASES_FLATMULTIINDEX_HH
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