/usr/include/colib/counted.h is in libiulib-dev 0.4+is+0.3-3.
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 | // -*- C++ -*-
// Copyright 2006 Deutsches Forschungszentrum fuer Kuenstliche Intelligenz
// or its licensors, as applicable.
// Copyright 1995-2005 Thomas M. Breuel.
//
// You may not use this file except under the terms of the accompanying license.
//
// Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Project: iulib -- image understanding library
// File: counted.h
// Purpose:
// Responsible: tmb
// Reviewer:
// Primary Repository:
// Web Sites: www.iupr.org, www.dfki.de
/// \file counted.h
/// \brief Link counting smart pointers.
#ifndef h_counted_
#define h_counted_
/// A smart pointer with a link counter.
template <class T>
class counted {
struct TC : T {
int refcount_;
};
TC *p;
public:
counted() {
p = 0;
}
counted(const counted<T> &other) {
other.incref();
p = other.p;
}
counted(counted<T> &other) {
other.incref();
p = other.p;
}
~counted() {
decref();
p = 0;
}
void operator=(counted<T> &other) {
other.incref();
decref();
p = other.p;
}
void operator=(const counted<T> &other) {
other.incref();
decref();
p = other.p;
}
void operator*=(counted<T> &other) {
other.incref();
decref();
p = other.p;
other.drop();
}
void operator*=(const counted<T> &other) {
other.incref();
decref();
p = other.p;
other.drop();
}
bool allocated() {
return !p;
}
void allocate() {
p = new TC();
p->refcount_ = 1;
}
operator bool() {
return !!p;
}
void drop() {
decref();
p = 0;
}
T &operator *() {
if(!p) allocate();
return *(T*)p;
}
T *operator->() {
if(!p) allocate();
return (T*)p;
}
operator T&() {
if(!p) allocate();
return *(T*)p;
}
operator T*() {
if(!p) allocate();
return (T*)p;
}
void incref() const {
check();
if(p) {
if(p->refcount_>10000000) abort();
if(p->refcount_<0) abort();
p->refcount_++;
}
}
void decref() const {
check();
if(p) {
if(--p->refcount_==0) delete p;
((counted<T>*)this)->p = 0;
}
}
void check() const {
if(!p) return;
if(p->refcount_>10000000) abort();
if(p->refcount_<0) abort();
}
};
#endif
|