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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef __ORCUS_STRING_POOL_HPP__
#define __ORCUS_STRING_POOL_HPP__
#include <string>
#include <boost/unordered_set.hpp>
#include <boost/ptr_container/ptr_vector.hpp>
#include <boost/functional/hash.hpp>
#include "env.hpp"
#include "pstring.hpp"
namespace orcus {
/**
* Implements string hash map.
*/
class ORCUS_DLLPUBLIC string_pool
{
struct string_hash
{
size_t operator() (const std::string* p) const;
private:
boost::hash<std::string> m_hash;
};
struct string_equal_to
{
bool operator() (const std::string* p1, const std::string* p2) const;
private:
std::equal_to<std::string> m_equal_to;
};
typedef boost::unordered_set<pstring, pstring::hash> string_set_type;
typedef boost::ptr_vector<std::string> string_store_type;
public:
string_pool();
~string_pool();
/**
* Intern a string.
*
* @param str string to intern. It must be null-terminated.
*
* @return pair whose first value is the interned string, and the second
* value specifies whether it is a newly created instance (true)
* or a reuse of an existing instance (false).
*/
std::pair<pstring, bool> intern(const char* str);
/**
* Intern a string.
*
*
* @param str string to intern. It doesn't need to be null-terminated.
* @param n length of the string.
*
* @return see above.
*/
std::pair<pstring, bool> intern(const char* str, size_t n);
/**
* Intern a string.
*
* @param str string to intern.
*
* @return see above.
*/
std::pair<pstring, bool> intern(const pstring& str);
void dump() const;
void clear();
size_t size() const;
private:
string_set_type m_set;
string_store_type m_store;
};
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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