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/********************* */
/*! \file ptr_closer.h
** \verbatim
** Top contributors (to current version):
** Tim King
** This file is part of the CVC4 project.
** Copyright (c) 2009-2017 by the authors listed in the file AUTHORS
** in the top-level source directory) and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
** \brief A class to close owned pointers in the destructor.
**
** A class to close owned pointers in the destructor.
**/
#include "cvc4_public.h"
#ifndef __CVC4__PTR_CLOSER_H
#define __CVC4__PTR_CLOSER_H
namespace CVC4 {
/**
* A class to close owned pointers in the destructor. This plays a similar role
* to unique_ptr, but without move semantics. This is designed to overcome the
* lack of having unique_ptr in C++05.
*
* This is a variant of unique_ptr that is not designed for move semantics.
* These are appropriate to own pointer allocations on the stack that should be
* deleted when an exception is thrown. These should be used with care within
* heap based data structures, and never as the return value of a function.
*/
template <class T>
class PtrCloser {
public:
PtrCloser() : d_pointer(NULL) {}
explicit PtrCloser(T* pointer) : d_pointer(pointer) {}
~PtrCloser() { delete d_pointer; }
/** Deletes the currently owned copy and takes ownership of pointer. */
void reset(T* pointer = NULL) {
delete d_pointer;
d_pointer = pointer;
}
/** Gives up ownership of the pointer to the caller. */
T* release() {
T* copy = d_pointer;
d_pointer = NULL;
return copy;
}
/** Returns the pointer. */
T* get() const { return d_pointer; }
/** Returns the pointer. Undefined if the pointer is null. */
T* operator->() const { return d_pointer; }
/** Returns true if the pointer is not-null. */
operator bool() const { return d_pointer != NULL; }
private:
PtrCloser(const PtrCloser*) CVC4_UNDEFINED;
PtrCloser& operator=(const PtrCloser&) CVC4_UNDEFINED;
/** An owned pointer object allocated by `new`. Or NULL. */
T* d_pointer;
}; /* class PtrCloser */
} /* CVC4 namespace */
#endif /* __CVC4__PTR_CLOSER_H */
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