/usr/include/swiginac/ptr.i is in python-swiginac 1.5.1.1-2.
This file is owned by root:root, with mode 0o644.
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(c) Copyright 2003, 2004, 2005
Author: Ola Skavhaug and Ondrej Certik
This file is part of swiginac.
swiginac 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 2 of the License, or
(at your option) any later version.
swiginac 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 swiginac; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/** Base class for reference-counted objects. */
class refcounted {
public:
refcounted() throw() : refcount(0) {}
size_t add_reference() throw() { return ++refcount; }
size_t remove_reference() throw() { return --refcount; }
size_t get_refcount() const throw() { return refcount; }
void set_refcount(size_t r) throw() { refcount = r; }
private:
size_t refcount; ///< reference counter
};
/** Class of (intrusively) reference-counted pointers that support
* copy-on-write semantics.
*
* Requirements for T:
* must support the refcounted interface (usually by being derived
* from refcounted)
* T* T::duplicate() member function (only if makewriteable() is used) */
template <class T> class ptr {
friend class std::less< ptr<T> >;
// NB: This implementation of reference counting is not thread-safe.
// The reference counter needs to be incremented/decremented atomically,
// and makewritable() requires locking.
public:
// no default ctor: a ptr is never unbound
/** Bind ptr to newly created object, start reference counting. */
ptr(T *t) throw() : p(t) { GINAC_ASSERT(p); p->set_refcount(1); }
/** Bind ptr to existing reference-counted object. */
explicit ptr(T &t) throw() : p(&t) { p->add_reference(); }
ptr(const ptr & other) throw() : p(other.p) { p->add_reference(); }
~ptr()
{
if (p->remove_reference() == 0)
delete p;
}
// ptr &operator=(const ptr & other)
// {
// // NB: must first add reference to "other", since other might be *this.
// other.p->add_reference();
// if (p->remove_reference() == 0)
// delete p;
// p = other.p;
// return *this;
// }
T &operator*() const throw() { return *p; }
T *operator->() const throw() { return p; }
friend inline T *get_pointer(const ptr & x) throw() { return x.p; }
/** Announce your intention to modify the object bound to this ptr.
* This ensures that the object is not shared by any other ptrs. */
void makewritable()
{
if (p->get_refcount() > 1) {
T *p2 = p->duplicate();
p2->set_refcount(1);
p->remove_reference();
p = p2;
}
}
/** Swap the bound object of this ptr with another ptr. */
void swap(ptr & other) throw()
{
T *t = p;
p = other.p;
other.p = t;
}
template <class U>
bool operator==(const ptr<U> & rhs) const throw() { return p == get_pointer(rhs); }
template <class U>
bool operator!=(const ptr<U> & rhs) const throw() { return p != get_pointer(rhs); }
template <class U>
inline friend bool operator==(const ptr & lhs, const U * rhs) throw() { return lhs.p == rhs; }
template <class U>
inline friend bool operator!=(const ptr & lhs, const U * rhs) throw() { return lhs.p != rhs; }
template <class U>
inline friend bool operator==(const U * lhs, const ptr & rhs) throw() { return lhs == rhs.p; }
template <class U>
inline friend bool operator!=(const U * lhs, const ptr & rhs) throw() { return lhs != rhs.p; }
inline friend std::ostream & operator<<(std::ostream & os, const ptr<T> & rhs)
{
os << rhs.p;
}
private:
T *p;
};
// vim:ft=cpp:
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