104 lines
2.3 KiB
C++
104 lines
2.3 KiB
C++
#ifndef CLICK_HASHCODE_HH
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#define CLICK_HASHCODE_HH
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CLICK_DECLS
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// Notes about the hashcode template: On GCC 4.3.0, "template <>" is required
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// on the specializations or they aren't used. Just plain overloaded
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// functions aren't used. The specializations must be e.g. "const char &",
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// not "char", or GCC complains about a specialization not matching the
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// general template. The main template takes a const reference for two
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// reasons. First, providing both "hashcode_t hashcode(T)" and "hashcode_t
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// hashcode(const T&)" leads to ambiguity errors. Second, providing only
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// "hashcode_t hashcode(T)" is slower by looks like 8% when T is a String,
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// because of copy constructors; for types with more expensive non-default
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// copy constructors this would probably be worse.
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typedef size_t hashcode_t; ///< Typical type for a hashcode() value.
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template <typename T>
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inline hashcode_t hashcode(T const &x) {
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return x.hashcode();
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}
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template <>
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inline hashcode_t hashcode(char const &x) {
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return x;
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}
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template <>
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inline hashcode_t hashcode(signed char const &x) {
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return x;
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}
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template <>
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inline hashcode_t hashcode(unsigned char const &x) {
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return x;
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}
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template <>
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inline hashcode_t hashcode(short const &x) {
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return x;
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}
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template <>
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inline hashcode_t hashcode(unsigned short const &x) {
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return x;
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}
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template <>
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inline hashcode_t hashcode(int const &x) {
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return x;
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}
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template <>
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inline hashcode_t hashcode(unsigned const &x) {
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return x;
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}
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template <>
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inline hashcode_t hashcode(long const &x) {
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return x;
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}
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template <>
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inline hashcode_t hashcode(unsigned long const &x) {
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return x;
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}
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#if HAVE_LONG_LONG
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template <>
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inline hashcode_t hashcode(long long const &x) {
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return (x >> 32) ^ x;
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}
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template <>
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inline hashcode_t hashcode(unsigned long long const &x) {
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return (x >> 32) ^ x;
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}
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#endif
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#if HAVE_INT64_TYPES && !HAVE_INT64_IS_LONG && !HAVE_INT64_IS_LONG_LONG
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template <>
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inline hashcode_t hashcode(int64_t const &x) {
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return (x >> 32) ^ x;
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}
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template <>
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inline hashcode_t hashcode(uint64_t const &x) {
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return (x >> 32) ^ x;
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}
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#endif
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template <typename T>
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inline hashcode_t hashcode(T * const &x) {
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return reinterpret_cast<uintptr_t>(x) >> 3;
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}
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template <typename T>
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inline typename T::key_const_reference hashkey(const T &x) {
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return x.hashkey();
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}
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CLICK_ENDDECLS
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#endif
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