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//===- llvm/ADT/scoped_ptr.h - basic smart pointer --------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the scoped_ptr smart pointer: scoped_ptr mimics a built-in
// pointer except that it guarantees deletion of the object pointed to, either
// on destruction of the scoped_ptr or via an explicit reset(). scoped_ptr is a
// simple solution for simple needs.
//
//===----------------------------------------------------------------------===//
//
// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
// Copyright (c) 2001, 2002 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file llvm/docs/BOOST_LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt )
//
// http://www.boost.org/libs/smart_ptr/scoped_ptr.htm
//
#ifndef LLVM_SCOPED_PTR_HPP_INCLUDED
#define LLVM_SCOPED_PTR_HPP_INCLUDED
#include <cassert>
namespace llvm {
// verify that types are complete for increased safety
template<class T> inline void checked_delete(T * x) {
// intentionally complex - simplification causes regressions
typedef char type_must_be_complete[ sizeof(T)? 1: -1 ];
(void) sizeof(type_must_be_complete);
delete x;
}
// scoped_ptr mimics a built-in pointer except that it guarantees deletion
// of the object pointed to, either on destruction of the scoped_ptr or via
// an explicit reset(). scoped_ptr is a simple solution for simple needs;
// use shared_ptr or std::auto_ptr if your needs are more complex.
template<class T> class scoped_ptr // noncopyable
{
private:
T * ptr;
scoped_ptr(scoped_ptr const &);
scoped_ptr & operator=(scoped_ptr const &);
typedef scoped_ptr<T> this_type;
public:
typedef T element_type;
explicit scoped_ptr(T * p = 0): ptr(p) // never throws
{
}
~scoped_ptr() // never throws
{
llvm::checked_delete(ptr);
}
void reset(T * p = 0) // never throws
{
assert( (p == 0 || p != ptr) && "scoped_ptr: self-reset error"); // catch self-reset errors
this_type(p).swap(*this);
}
T & operator*() const // never throws
{
assert(ptr != 0 && "scoped_ptr: Trying to dereference a null pointeur");
return *ptr;
}
T * operator->() const // never throws
{
assert(ptr != 0 && "scoped_ptr: Trying to dereference a null pointeur");
return ptr;
}
T * get() const // never throws
{
return ptr;
}
// implicit conversion to "bool"
typedef T * this_type::*unspecified_bool_type;
operator unspecified_bool_type() const // never throws
{
return ptr == 0? 0: &this_type::ptr;
}
bool operator! () const // never throws
{
return ptr == 0;
}
void swap(scoped_ptr & b) // never throws
{
T * tmp = b.ptr;
b.ptr = ptr;
ptr = tmp;
}
};
template<class T> inline void swap(scoped_ptr<T> & a, scoped_ptr<T> & b) // never throws
{
a.swap(b);
}
// get_pointer(p) is a generic way to say p.get()
template<class T> inline T * get_pointer(scoped_ptr<T> const & p)
{
return p.get();
}
} // namespace llvm
#endif // #ifndef LLVM_SCOPED_PTR_HPP_INCLUDED
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