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42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
//===-- HashExtras.h - Useful functions for STL hash containers -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains some templates that are useful if you are working with the
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// STL Hashed containers.
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//
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// No library is required when using these functinons.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SUPPORT_HASHEXTRAS_H
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#define SUPPORT_HASHEXTRAS_H
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#include "Support/hash_map"
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#include <string>
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// Cannot specialize hash template from outside of the std namespace.
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namespace HASH_NAMESPACE {
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template <> struct hash<std::string> {
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size_t operator()(std::string const &str) const {
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return hash<char const *>()(str.c_str());
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}
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};
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// Provide a hash function for arbitrary pointers...
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template <class T> struct hash<T *> {
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inline size_t operator()(const T *Val) const {
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return reinterpret_cast<size_t>(Val);
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}
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};
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} // End namespace std
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#endif
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