125 lines
3.0 KiB
C++
125 lines
3.0 KiB
C++
// $Id$
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// $Source$
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// @HEADER
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// ***********************************************************************
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//
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// Sacado Package
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// Copyright (2006) Sandia Corporation
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//
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// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
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// license for use of this work by or on behalf of the U.S. Government.
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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// USA
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// Questions? Contact David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
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// (etphipp@sandia.gov).
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//
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// ***********************************************************************
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// @HEADER
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#ifndef SACADO_HANDLE_HPP
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#define SACADO_HANDLE_HPP
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namespace Sacado {
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/*!
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* \brief A generic handle class
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*/
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template <typename T>
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class Handle {
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public:
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//! Create new handle from pointer \c p
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Handle(T* p) : rep(p), count(new int(1)) {}
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//! Copy handle
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Handle(const Handle& h) : rep(h.rep), count(h.count) { (*count)++; }
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//! Destroy handle
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~Handle() { decrementRef(); }
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//! Return pointer to underlying data
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T* get() { return rep; }
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//! Return pointer to underlying data
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const T* get() const { return rep; }
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//! Assign to handle \c h as its own copy
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void Assign(const Handle& h) {
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decrementRef();
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rep = new T(*(h.rep));
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count = new int(1);
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}
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//! Make handle have its own copy of \c rep
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void makeOwnCopy() {
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T *tmp;
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if (*count > 1) {
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tmp = rep;
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(*count)--;
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rep = new T(*tmp);
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count = new int(1);
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}
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}
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//! Assignment operator
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Handle& operator = (const Handle& h) {
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if (this != &h) {
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decrementRef();
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rep = h.rep;
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count = h.count;
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(*count)++;
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}
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return *this;
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}
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//! Dereference
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T* operator -> () const { return rep; }
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//! Dereference
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const T& operator * () const { return *rep; }
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//! Dereference
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T& operator * () { return *rep; }
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private:
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//! Pointer to data
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T *rep;
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//! Reference count
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int *count;
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//! Decrement reference
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void decrementRef() {
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(*count)--;
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if (*count == 0) {
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delete rep;
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delete count;
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}
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}
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}; // class Handle
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//! Compare two handles
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template <typename T>
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bool operator==(const Handle<T>& h1, const Handle<T>& h2) {
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return h1.get() == h2.get();
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}
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} // namespace Sacado
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#endif // SACADO_HANDLE_HPP
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