/usr/include/viennacl/tools/shared_ptr.hpp is in libviennacl-dev 1.5.2-2.
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 | #ifndef VIENNACL_TOOLS_SHARED_PTR_HPP
#define VIENNACL_TOOLS_SHARED_PTR_HPP
/* =========================================================================
Copyright (c) 2010-2012, Institute for Microelectronics,
Institute for Analysis and Scientific Computing,
TU Wien.
Portions of this software are copyright by UChicago Argonne, LLC.
-----------------
ViennaCL - The Vienna Computing Library
-----------------
Project Head: Karl Rupp rupp@iue.tuwien.ac.at
(A list of authors and contributors can be found in the PDF manual)
License: MIT (X11), see file LICENSE in the base directory
============================================================================= */
/** @file tools/shared_ptr.hpp
@brief Implementation of a shared pointer class (cf. std::shared_ptr, boost::shared_ptr). Will be used until C++11 is widely available.
Contributed by Philippe Tillet.
*/
#include <cstdlib>
#include <algorithm>
namespace viennacl
{
namespace tools
{
namespace detail
{
/** @brief Reference counting class for the shared_ptr implementation */
class count
{
public:
count(unsigned int val) : val_(val){ }
void dec(){ --val_; }
void inc(){ ++val_; }
bool is_null(){ return val_ == 0; }
unsigned int val(){ return val_; }
private:
unsigned int val_;
};
/** @brief Interface for the reference counter inside the shared_ptr */
struct aux
{
detail::count count;
aux() :count(1) {}
virtual void destroy()=0;
virtual ~aux() {}
};
/** @brief Implementation helper for the reference counting mechanism inside shared_ptr. */
template<class U, class Deleter>
struct auximpl: public detail::aux
{
U* p;
Deleter d;
auximpl(U* pu, Deleter x) :p(pu), d(x) {}
virtual void destroy() { d(p); }
};
/** @brief Default deleter class for a pointer. The default is to just call 'delete' on the pointer. Provide your own implementations for 'delete[]' and 'free'. */
template<class U>
struct default_deleter
{
void operator()(U* p) const { delete p; }
};
}
/** @brief A shared pointer class similar to boost::shared_ptr. Reimplemented in order to avoid a Boost-dependency. Will be replaced by std::shared_ptr as soon as C++11 is widely available. */
template<class T>
class shared_ptr
{
template<class U>
friend class shared_ptr;
detail::aux* pa;
T* pt;
public:
shared_ptr() :pa(NULL), pt(NULL) {}
template<class U, class Deleter>
shared_ptr(U* pu, Deleter d) : pa(new detail::auximpl<U, Deleter>(pu, d)), pt(pu) {}
template<class U>
explicit shared_ptr(U* pu) : pa(new detail::auximpl<U, detail::default_deleter<U> >(pu, detail::default_deleter<U>())), pt(pu) {}
shared_ptr(const shared_ptr& s) :pa(s.pa), pt(s.pt) { inc(); }
template<class U>
shared_ptr(const shared_ptr<U>& s) :pa(s.pa), pt(s.pt) { inc(); }
~shared_ptr() { dec(); }
void reset(){
shared_ptr<T>().swap(*this);
}
void reset(T * ptr){
shared_ptr<T>(ptr).swap(*this);
}
void swap(shared_ptr<T> & other){
std::swap(pt,other.pt);
std::swap(pa, other.pa);
}
shared_ptr& operator=(const shared_ptr& s)
{
if(this!=&s)
{
dec();
pa = s.pa;
pt = s.pt;
inc();
}
return *this;
}
T* get() const { return pt; }
T* operator->() const { return pt; }
T& operator*() const { return *pt; }
void inc() { if(pa) pa->count.inc(); }
void dec()
{
if(pa)
{
pa->count.dec();
if(pa->count.is_null())
{
pa->destroy();
delete pa;
pa = NULL;
}
}
}
};
}
}
#endif // VIENNACL_UTILS_SHARED_PTR_HPP
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