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typeseq.h
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typeseq.h
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#pragma once
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is COID/comm module.
*
* The Initial Developer of the Original Code is
* Outerra.
* Portions created by the Initial Developer are Copyright (C) 2021
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Brano Kemen
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "namespace.h"
#include "token.h"
#include "dynarray.h"
#include "sync/mutex.h"
COID_NAMESPACE_BEGIN
/// @brief a registrar that assigns unique sequential id for any queried type
/// The assigned ID is cached in a static variable of a template specialization for the type, so repeated
/// queries are fast. First time initialization and first time request from a different dll module uses
/// a mutex to ensure a correct registration
template<typename OWNER>
class type_sequencer
{
template <class T>
struct id_holder {
inline static int slot = -1;
};
public:
type_sequencer() : _mux(500, false)
{
_types.reserve_virtual(1 << 20);
}
virtual ~type_sequencer() {}
struct entry {
token type_name;
size_t size = 0;
int id = -1;
};
/// @brief Get or assign an id for type T
/// @tparam T
/// @return cached or assigned id
/// @note IDs are generated sequentially, 0-based index
template <class T>
int type_id()
{
int& rid = id_holder<T>::slot;
if (rid >= 0)
return rid;
//needs allocating (or finding if this is a query from different module)
constexpr token ti = token::type_name<T>();
return rid = *allocate(ti, sizeof(T), true);
}
/// @brief Get an existing id that was assigned to the type
/// @tparam T
/// @return nullptr if the id wasn't assigned yet
template <class T>
const int* existing_id() {
int& rid = id_holder<T>::slot;
if (rid >= 0)
return &rid;
constexpr token ti = token::type_name<T>();
int* enid = allocate(ti, sizeof(T), false);
return enid ? &(rid = *enid) : nullptr;
}
/// @brief Pre-allocate type, with possibility to change the id value
/// @tparam T
/// @param cbk optional callback executed under mutex lock
/// @return Reference to the id value. Value of -1 is reserved for uninitialized state.
template <class T>
int assign()
{
constexpr token ti = token::type_name<T>();
comm_mutex_guard g(_mux);
return *allocate(ti, sizeof(T), true);
}
/// @brief Pre-allocate type, with possibility to change the id value
/// @tparam T
/// @param cbk optional callback executed under mutex lock
/// @return Reference to the id value. Value of -1 is reserved for uninitialized state.
template <class T>
int assign(const function<void(int&, const entry&)>& cbk)
{
constexpr token ti = token::type_name<T>();
comm_mutex_guard g(_mux);
int id = *allocate(ti, sizeof(T), true);
if (cbk) {
int oldid = id;
cbk(id, _types[id]);
_types[oldid].id = id;
}
return id;
}
const dynarray32<entry>& types() const {
return _types;
}
const entry* type(uint i) const {
return i < _types.size() ? &_types[i] : nullptr;
}
template<class T>
const coid::token& name()
{
return _types[id<T>()].type_name;
}
private:
//virtual here is for always calling the main module implementation and not (possibly) outdated dll one
virtual int* allocate(const token& type_name, size_t size, bool create)
{
for (entry& en : _types) {
if (en.type_name == type_name)
return &en.id;
}
if (!create)
return nullptr;
uint id = _types.size();
entry* en = _types.add();
en->type_name = type_name;
en->size = size;
en->id = id;
return &en->id;
}
dynarray32<entry> _types;
comm_mutex _mux;
};
COID_NAMESPACE_END