ZeroTierOne/node/Containers.hpp

/*
 * Copyright (c)2013-2020 ZeroTier, Inc.
 *
 * Use of this software is governed by the Business Source License included
 * in the LICENSE.TXT file in the project's root directory.
 *
 * Change Date: 2024-01-01
 *
 * On the date above, in accordance with the Business Source License, use
 * of this software will be governed by version 2.0 of the Apache License.
 */
/****/

#ifndef ZT_MAP_HPP
#define ZT_MAP_HPP

/* This defines a Map, SortedMap, Vector, etc. based on STL templates. */

#include "Constants.hpp"
#include "Utils.hpp"

#ifdef __CPP11__
#include <unordered_map>
#endif
#include <map>
#include <vector>
#include <list>
#include <set>
#include <string>

namespace ZeroTier {

#ifdef __CPP11__
struct _MapHasher
{
	template<typename O>
	std::size_t operator()(const O &obj) const noexcept { return (std::size_t)obj.hashCode(); }
	std::size_t operator()(const uint64_t i) const noexcept { return (std::size_t)Utils::hash64(i ^ Utils::s_mapNonce); }
	std::size_t operator()(const int64_t i) const noexcept { return (std::size_t)Utils::hash64((uint64_t)i ^ Utils::s_mapNonce); }
	std::size_t operator()(const uint32_t i) const noexcept { return (std::size_t)Utils::hash32(i ^ (uint32_t)Utils::s_mapNonce); }
	std::size_t operator()(const int32_t i) const noexcept { return (std::size_t)Utils::hash32((uint32_t)i ^ (uint32_t)Utils::s_mapNonce); }
};

template<typename K,typename V>
class Map : public std::unordered_map< K,V,_MapHasher,std::equal_to<K>,Utils::Mallocator< std::pair<const K,V> > >
{
public:
	ZT_INLINE V *get(const K &key) noexcept
	{
		typename Map::iterator i(this->find(key));
		if (i == this->end())
			return nullptr;
		return &(i->second);
	}

	ZT_INLINE const V *get(const K &key) const noexcept
	{
		typename Map::const_iterator i(this->find(key));
		if (i == this->end())
			return nullptr;
		return &(i->second);
	}

	ZT_INLINE void set(const K &key,const V &value)
	{
		this->emplace(key,value);
	}
};
#else
template<typename K,typename V>
class Map : public std::map< K,V,std::less<K>,Utils::Mallocator< std::pair<const K,V> > >
{
public:
	ZT_INLINE V *get(const K &key) noexcept
	{
		typename Map::iterator i(this->find(key));
		if (i == this->end())
			return nullptr;
		return &(i->second);
	}

	ZT_INLINE const V *get(const K &key) const noexcept
	{
		typename Map::const_iterator i(this->find(key));
		if (i == this->end())
			return nullptr;
		return &(i->second);
	}

	ZT_INLINE void set(const K &key,const V &value)
	{
		(*this)[key] = value;
	}
};
#endif

template<typename K,typename V>
class SortedMap : public std::map< K,V,std::less<K>,Utils::Mallocator< std::pair<const K,V> > >
{
public:
	ZT_INLINE V *get(const K &key) noexcept
	{
		typename SortedMap::iterator i(this->find(key));
		if (i == this->end())
			return nullptr;
		return &(i->second);
	}

	ZT_INLINE const V *get(const K &key) const noexcept
	{
		typename SortedMap::const_iterator i(this->find(key));
		if (i == this->end())
			return nullptr;
		return &(i->second);
	}

	ZT_INLINE void set(const K &key,const V &value)
	{
		(*this)[key] = value;
	}
};

template<typename V>
class Vector : public std::vector< V,Utils::Mallocator<V> >
{
};

template<typename V>
class List : public std::list< V,Utils::Mallocator<V> >
{
};

template<typename V>
class Set : public std::set< V,std::less<V>,Utils::Mallocator<V> >
{
};

class String : public std::basic_string< char,std::char_traits<char>,Utils::Mallocator<char> >
{
public:
	explicit ZT_INLINE String(const char *const s) { assign(s); }
};

} // ZeroTier

#endif