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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 INCLUDED_ORCUS_STRING_POOL_HPP
#define INCLUDED_ORCUS_STRING_POOL_HPP
#include "env.hpp"
#include <string>
#include <memory>
#include <vector>
namespace orcus {
/**
* This class implements a shared string pool with the ability to merge with
* other pools.
*
* @note This class is not copy-constructible, but is move-constructible.
*/
class ORCUS_PSR_DLLPUBLIC string_pool
{
public:
string_pool(const string_pool&) = delete;
string_pool& operator=(const string_pool&) = delete;
string_pool();
string_pool(string_pool&& other);
~string_pool();
/**
* Intern a string.
*
* @param str string to intern.
*
* @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<std::string_view, bool> intern(std::string_view str);
/**
* Return all interned strings.
*
* @return sequence of all interned strings. The sequence will be sorted.
*/
std::vector<std::string_view> get_interned_strings() const;
/**
* Dump pool's content to stdout.
*
* @todo This needs to be reworked to make it more generally usable.
*/
void dump() const;
/**
* Clear pool's content.
*/
void clear();
/**
* Query the total number of strings stored in the pool.
*
* @return size_t total number of strings in the pool.
*/
size_t size() const;
/**
* Swap the content with another string-pool instance.
*
*
* @param other string-pool instance to swap contents with.
*/
void swap(string_pool& other);
/**
* Merge another string pool instance in. This will not invalidate any
* string references to the other pool.
*
* The other string pool instance will become empty when this call
* returns.
*
* @param other string pool instance to merge in.
*/
void merge(string_pool& other);
private:
struct impl;
std::unique_ptr<impl> mp_impl;
};
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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