mirror of
https://github.com/KingDuckZ/dindexer.git
synced 2024-11-25 00:53:43 +00:00
99 lines
2.2 KiB
C++
99 lines
2.2 KiB
C++
/* Copyright 2015, 2016, Michele Santullo
|
|
* This file is part of "dindexer".
|
|
*
|
|
* "dindexer" is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* "dindexer" is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with "dindexer". If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef id982AF1D5C59C415584F56C1E6DDFE55E
|
|
#define id982AF1D5C59C415584F56C1E6DDFE55E
|
|
|
|
#include <ciso646>
|
|
#include <cassert>
|
|
|
|
#if !defined(NDEBUG)
|
|
# define LEANBASE_ASSERT_REENTRANCY
|
|
#endif
|
|
|
|
namespace mchlib {
|
|
namespace scantask {
|
|
#if defined(LEANBASE_ASSERT_REENTRANCY)
|
|
struct AutoSetBool {
|
|
explicit AutoSetBool ( bool* parBool ) :
|
|
m_bool(parBool)
|
|
{
|
|
assert(m_bool);
|
|
assert(not *m_bool);
|
|
*m_bool = true;
|
|
}
|
|
~AutoSetBool ( void ) noexcept {
|
|
*m_bool = false;
|
|
}
|
|
|
|
bool* m_bool;
|
|
};
|
|
#endif
|
|
|
|
template <typename T>
|
|
class LeanBase {
|
|
protected:
|
|
LeanBase ( void );
|
|
virtual ~LeanBase ( void ) noexcept = default;
|
|
|
|
void unset_data_created ( void );
|
|
|
|
public:
|
|
T& get_or_create ( void );
|
|
|
|
private:
|
|
virtual void on_data_fill ( void ) = 0;
|
|
virtual T& on_data_get ( void ) = 0;
|
|
|
|
bool m_data_created;
|
|
#if defined(LEANBASE_ASSERT_REENTRANCY)
|
|
bool m_inside_call;
|
|
#endif
|
|
};
|
|
|
|
template <typename T>
|
|
LeanBase<T>::LeanBase() :
|
|
m_data_created(false)
|
|
#if defined(LEANBASE_ASSERT_REENTRANCY)
|
|
, m_inside_call(false)
|
|
#endif
|
|
{
|
|
}
|
|
|
|
template <typename T>
|
|
T& LeanBase<T>::get_or_create() {
|
|
#if defined(LEANBASE_ASSERT_REENTRANCY)
|
|
assert(not m_inside_call);
|
|
AutoSetBool auto_bool(&m_inside_call);
|
|
#endif
|
|
|
|
if (not m_data_created) {
|
|
m_data_created = true;
|
|
this->on_data_fill();
|
|
}
|
|
return this->on_data_get();
|
|
}
|
|
|
|
template <typename T>
|
|
void LeanBase<T>::unset_data_created() {
|
|
assert(m_data_created);
|
|
m_data_created = false;
|
|
}
|
|
} //namespace scantask
|
|
} //namespace mchlib
|
|
|
|
#endif
|