llvm-6502/include/Support/HashExtras.h
2002-01-20 22:54:45 +00:00

33 lines
866 B
C++

//===-- HashExtras.h - Useful functions for STL hash containers --*- C++ -*--=//
//
// 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 LLVM_SUPPORT_HASHEXTRAS_H
#define LLVM_SUPPORT_HASHEXTRAS_H
#include <string>
#include <ext/hash_map>
// Cannot specialize hash template from outside of the std namespace.
namespace std {
template <> struct hash<string> {
size_t operator()(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 (size_t)Val; }
};
} // End namespace std
#endif