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