hash-str.h

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/* ScummVM - Graphic Adventure Engine
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 * file distributed with this source distribution.
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 * as published by the Free Software Foundation; either version 2
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#ifndef COMMON_HASH_STR_H
#define COMMON_HASH_STR_H

#include "common/hashmap.h"
#include "common/str.h"

namespace Common {

uint hashit(const char *str);
uint hashit_lower(const char *str); // Generate a hash based on the lowercase version of the string
inline uint hashit(const String &str) { return hashit(str.c_str()); }
inline uint hashit_lower(const String &str) { return hashit_lower(str.c_str()); }

// FIXME: The following functors obviously are not consistently named

struct CaseSensitiveString_EqualTo {
    bool operator()(const String& x, const String& y) const { return x.equals(y); }
};

struct CaseSensitiveString_Hash {
    uint operator()(const String& x) const { return hashit(x.c_str()); }
};


struct IgnoreCase_EqualTo {
    bool operator()(const String& x, const String& y) const { return x.equalsIgnoreCase(y); }
};

struct IgnoreCase_Hash {
    uint operator()(const String& x) const { return hashit_lower(x.c_str()); }
};

// Specalization of the Hash functor for String objects.
// We do case sensitve hashing here, because that is what
// the default EqualTo is compatible with. If one wants to use
// case insensitve hashing, then only because one wants to use
// IgnoreCase_EqualTo, and then one has to specify a custom
// hash anyway.
template<>
struct Hash<String> {
    uint operator()(const String& s) const {
        return hashit(s.c_str());
    }
};

template<>
struct Hash<const char *> {
    uint operator()(const char *s) const {
        return hashit(s);
    }
};

// String map -- by default case insensitive
typedef HashMap<String, String, IgnoreCase_Hash, IgnoreCase_EqualTo> StringMap;

} // End of namespace Common

#endif