/usr/include/mia-2.4/mia/core/singular_refobj.hh is in libmia-2.4-dev 2.4.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 | /* -*- mia-c++ -*-
*
* This file is part of MIA - a toolbox for medical image analysis
* Copyright (c) Leipzig, Madrid 1999-2016 Gert Wollny
*
* MIA 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.
*
* This program 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 MIA; if not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef mia_singular_refobj_hh
#define mia_singular_refobj_hh
#include <mia/core/defines.hh>
#include <cassert>
NS_MIA_BEGIN
/**
\brief a singulater reference counted object that gets destroyed when the refount goes to zero
This template handles singular objects that must no be copied (e.g. a resource)
but that do also not fit the sigleton pattern. An example use are the HDF5 file, group, and
dataset handles.
\tparam T type of the data to be hold
\tparam D type of a functor that frees the resource. It must provide a static method
static void apply(T& data) that frees the resource.
*/
template <typename T>
class TSingleReferencedObject {
public:
struct Destructor {
Destructor(){}
virtual void operator ()(T& MIA_PARAM_UNUSED(data)) const = 0;
};
struct EmptyDestructor : public Destructor{
EmptyDestructor(){}
virtual void operator ()(T& MIA_PARAM_UNUSED(data))const {}
};
static const EmptyDestructor empty_destructor;
TSingleReferencedObject();
TSingleReferencedObject(T data, const Destructor& d = empty_destructor);
TSingleReferencedObject(const TSingleReferencedObject<T>& other);
TSingleReferencedObject& operator = (const TSingleReferencedObject<T>& other);
~TSingleReferencedObject();
operator T()const;
unsigned get_refcount()const;
private:
class TheObject {
public:
TheObject(T data, const TSingleReferencedObject::Destructor& d);
~TheObject();
void add_ref();
bool del_ref();
T get() const;
unsigned get_refcount()const;
private:
TheObject(const TheObject& data) = delete;
TheObject& operator = (const TheObject& data) = delete;
T m_data;
unsigned m_refcount;
const Destructor& m_destructor;
};
TheObject *m_object;
};
template <typename T>
const typename TSingleReferencedObject<T>::EmptyDestructor TSingleReferencedObject<T>::empty_destructor;
template <typename T>
TSingleReferencedObject<T>::TSingleReferencedObject():
m_object(nullptr)
{
}
template <typename T>
TSingleReferencedObject<T>::TSingleReferencedObject(T data, const Destructor& d)
{
m_object = new TheObject(data, d);
}
template <typename T>
TSingleReferencedObject<T>::TSingleReferencedObject(const TSingleReferencedObject<T>& other)
{
m_object = other.m_object;
if (m_object)
m_object->add_ref();
}
template <typename T>
TSingleReferencedObject<T>& TSingleReferencedObject<T>::operator = (const TSingleReferencedObject<T>& other)
{
if (m_object)
m_object->del_ref();
m_object = other.m_object;
if (m_object)
m_object->add_ref();
return *this;
}
template <typename T>
TSingleReferencedObject<T>::~TSingleReferencedObject()
{
if (m_object)
if (m_object->del_ref())
delete m_object;
}
template <typename T>
TSingleReferencedObject<T>::operator T() const
{
return m_object->get();
}
template <typename T>
unsigned TSingleReferencedObject<T>::get_refcount()const
{
if (m_object)
return m_object->get_refcount();
else
return 0;
}
template <typename T>
TSingleReferencedObject<T>::TheObject::TheObject(T data, const Destructor& d):
m_data(data),
m_refcount(1),
m_destructor(d)
{
}
template <typename T>
TSingleReferencedObject<T>::TheObject::~TheObject()
{
assert(m_refcount == 0);
m_destructor(m_data);
}
template <typename T>
void TSingleReferencedObject<T>::TheObject::add_ref()
{
++m_refcount;
}
template <typename T>
bool TSingleReferencedObject<T>::TheObject::del_ref()
{
--m_refcount;
return (m_refcount <= 0);
}
template <typename T>
unsigned TSingleReferencedObject<T>::TheObject::get_refcount()const
{
return m_refcount;
}
template <typename T>
T TSingleReferencedObject<T>::TheObject::get() const
{
return m_data;
}
NS_MIA_END
#endif
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