/usr/include/pbcopper/utility/EnumClassHash.h is in libpbcopper-dev 0.0.1+20161202-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | #ifndef PBCOPPER_UTILITY_ENUMCLASSHASH_H
#define PBCOPPER_UTILITY_ENUMCLASSHASH_H
#include <cstddef>
namespace PacBio {
namespace Utility {
///
/// \brief The EnumClassHash struct enables the use of enum class types as keys
/// for std::unordered_map.
///
/// Allows something like:
///
/// \code{.cpp}
/// std::unordered_map<Key_t, Value_t, EnumClassHash> myLookup;
/// \endcode
///
/// where Key_t is an enum class. Without this sort of extra hand-holding to
/// provide a 'manual' hash value, enum classes as keys will fail to compile.
///
/// \note This approach might be unnecessary in C++14, if I understand some of
/// the changes correctly. But this works for C++11 and should continue beyond.
///
/// \sa http://stackoverflow.com/questions/18837857/cant-use-enum-class-as-unordered-map-key
///
struct EnumClassHash
{
template<typename T> size_t operator()(const T t) const
{ return static_cast<size_t>(t); }
};
} // namespace Utility
} // namespace PacBio
#endif // PBCOPPER_UTILITY_ENUMCLASSHASH_H
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