third_party/cld/base/scoped_ptr.h - platform/external/chromium_org - Git at Google

 // Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #ifndef BASE_SCOPED_PTR_H__
 #define BASE_SCOPED_PTR_H__

 //  This is an implementation designed to match the anticipated future TR2
 //  implementation of the scoped_ptr class, and its closely-related brethren,
 //  scoped_array, scoped_ptr_malloc, and make_scoped_ptr.
 //
 //  See http://wiki/Main/ScopedPointerInterface for the spec that drove this
 //  file.

 #include <assert.h>
 #include <stdlib.h>
 #include <cstddef>

 #ifdef OS_EMBEDDED_QNX
 // NOTE(akirmse):
 // The C++ standard says that <stdlib.h> declares both ::foo and std::foo
 // But this isn't done in QNX version 6.3.2 200709062316.
 using std::free;
 using std::malloc;
 using std::realloc;
 #endif

 template <class C> class scoped_ptr;
 template <class C, class Free> class scoped_ptr_malloc;
 template <class C> class scoped_array;

 template <class C>
 scoped_ptr<C> make_scoped_ptr(C *);

 // A scoped_ptr<T> is like a T*, except that the destructor of scoped_ptr<T>
 // automatically deletes the pointer it holds (if any).
 // That is, scoped_ptr<T> owns the T object that it points to.
 // Like a T*, a scoped_ptr<T> may hold either NULL or a pointer to a T object.
 // Also like T*, scoped_ptr<T> is thread-compatible, and once you
 // dereference it, you get the threadsafety guarantees of T.
 //
 // The size of a scoped_ptr is small:
 // sizeof(scoped_ptr<C>) == sizeof(C*)
 template <class C>
 class scoped_ptr {
  public:

   // The element type
   typedef C element_type;

   // Constructor.  Defaults to intializing with NULL.
   // There is no way to create an uninitialized scoped_ptr.
   // The input parameter must be allocated with new.
   explicit scoped_ptr(C* p = NULL) : ptr_(p) { }

   // Destructor.  If there is a C object, delete it.
   // We don't need to test ptr_ == NULL because C++ does that for us.
   ~scoped_ptr() {
     enum { type_must_be_complete = sizeof(C) };
     delete ptr_;
   }

   // Reset.  Deletes the current owned object, if any.
   // Then takes ownership of a new object, if given.
   // this->reset(this->get()) works.
   void reset(C* p = NULL) {
     if (p != ptr_) {
       enum { type_must_be_complete = sizeof(C) };
       delete ptr_;
       ptr_ = p;
     }
   }

   // Accessors to get the owned object.
   // operator* and operator-> will assert() if there is no current object.
   C& operator*() const {
     assert(ptr_ != NULL);
     return *ptr_;
   }
   C* operator->() const  {
     assert(ptr_ != NULL);
     return ptr_;
   }
   C* get() const { return ptr_; }

   // Comparison operators.
   // These return whether a scoped_ptr and a raw pointer refer to
   // the same object, not just to two different but equal objects.
   bool operator==(const C* p) const { return ptr_ == p; }
   bool operator!=(const C* p) const { return ptr_ != p; }

   // Swap two scoped pointers.
   void swap(scoped_ptr& p2) {
     C* tmp = ptr_;
     ptr_ = p2.ptr_;
     p2.ptr_ = tmp;
   }

   // Release a pointer.
   // The return value is the current pointer held by this object.
   // If this object holds a NULL pointer, the return value is NULL.
   // After this operation, this object will hold a NULL pointer,
   // and will not own the object any more.
   C* release() {
     C* retVal = ptr_;
     ptr_ = NULL;
     return retVal;
   }

  private:
   C* ptr_;

   // google3 friend class that can access copy ctor (although if it actually
   // calls a copy ctor, there will be a problem) see below
   friend scoped_ptr<C> make_scoped_ptr<C>(C *p);

   // Forbid comparison of scoped_ptr types.  If C2 != C, it totally doesn't
   // make sense, and if C2 == C, it still doesn't make sense because you should
   // never have the same object owned by two different scoped_ptrs.
   template <class C2> bool operator==(scoped_ptr<C2> const& p2) const;
   template <class C2> bool operator!=(scoped_ptr<C2> const& p2) const;

   // Disallow evil constructors
   scoped_ptr(const scoped_ptr&);
   void operator=(const scoped_ptr&);
 };

 // Free functions
 template <class C>
 inline void swap(scoped_ptr<C>& p1, scoped_ptr<C>& p2) {
   p1.swap(p2);
 }

 template <class C>
 inline bool operator==(const C* p1, const scoped_ptr<C>& p2) {
   return p1 == p2.get();
 }

 template <class C>
 inline bool operator==(const C* p1, const scoped_ptr<const C>& p2) {
   return p1 == p2.get();
 }

 template <class C>
 inline bool operator!=(const C* p1, const scoped_ptr<C>& p2) {
   return p1 != p2.get();
 }

 template <class C>
 inline bool operator!=(const C* p1, const scoped_ptr<const C>& p2) {
   return p1 != p2.get();
 }

 template <class C>
 scoped_ptr<C> make_scoped_ptr(C *p) {
   // This does nothing but to return a scoped_ptr of the type that the passed
   // pointer is of.  (This eliminates the need to specify the name of T when
   // making a scoped_ptr that is used anonymously/temporarily.)  From an
   // access control point of view, we construct an unnamed scoped_ptr here
   // which we return and thus copy-construct.  Hence, we need to have access
   // to scoped_ptr::scoped_ptr(scoped_ptr const &).  However, it is guaranteed
   // that we never actually call the copy constructor, which is a good thing
   // as we would call the temporary's object destructor (and thus delete p)
   // if we actually did copy some object, here.
   return scoped_ptr<C>(p);
 }

 // scoped_array<C> is like scoped_ptr<C>, except that the caller must allocate
 // with new [] and the destructor deletes objects with delete [].
 //
 // As with scoped_ptr<C>, a scoped_array<C> either points to an object
 // or is NULL.  A scoped_array<C> owns the object that it points to.
 // scoped_array<T> is thread-compatible, and once you index into it,
 // the returned objects have only the threadsafety guarantees of T.
 //
 // Size: sizeof(scoped_array<C>) == sizeof(C*)
 template <class C>
 class scoped_array {
  public:

   // The element type
   typedef C element_type;

   // Constructor.  Defaults to intializing with NULL.
   // There is no way to create an uninitialized scoped_array.
   // The input parameter must be allocated with new [].
   explicit scoped_array(C* p = NULL) : array_(p) { }

   // Destructor.  If there is a C object, delete it.
   // We don't need to test ptr_ == NULL because C++ does that for us.
   ~scoped_array() {
     enum { type_must_be_complete = sizeof(C) };
     delete[] array_;
   }

   // Reset.  Deletes the current owned object, if any.
   // Then takes ownership of a new object, if given.
   // this->reset(this->get()) works.
   void reset(C* p = NULL) {
     if (p != array_) {
       enum { type_must_be_complete = sizeof(C) };
       delete[] array_;
       array_ = p;
     }
   }

   // Get one element of the current object.
   // Will assert() if there is no current object, or index i is negative.
   C& operator[](std::ptrdiff_t i) const {
     assert(i >= 0);
     assert(array_ != NULL);
     return array_[i];
   }

   // Get a pointer to the zeroth element of the current object.
   // If there is no current object, return NULL.
   C* get() const {
     return array_;
   }

   // Comparison operators.
   // These return whether a scoped_array and a raw pointer refer to
   // the same array, not just to two different but equal arrays.
   bool operator==(const C* p) const { return array_ == p; }
   bool operator!=(const C* p) const { return array_ != p; }

   // Swap two scoped arrays.
   void swap(scoped_array& p2) {
     C* tmp = array_;
     array_ = p2.array_;
     p2.array_ = tmp;
   }

   // Release an array.
   // The return value is the current pointer held by this object.
   // If this object holds a NULL pointer, the return value is NULL.
   // After this operation, this object will hold a NULL pointer,
   // and will not own the object any more.
   C* release() {
     C* retVal = array_;
     array_ = NULL;
     return retVal;
   }

  private:
   C* array_;

   // Forbid comparison of different scoped_array types.
   template <class C2> bool operator==(scoped_array<C2> const& p2) const;
   template <class C2> bool operator!=(scoped_array<C2> const& p2) const;

   // Disallow evil constructors
   scoped_array(const scoped_array&);
   void operator=(const scoped_array&);
 };

 // Free functions
 template <class C>
 inline void swap(scoped_array<C>& p1, scoped_array<C>& p2) {
   p1.swap(p2);
 }

 template <class C>
 inline bool operator==(const C* p1, const scoped_array<C>& p2) {
   return p1 == p2.get();
 }

 template <class C>
 inline bool operator==(const C* p1, const scoped_array<const C>& p2) {
   return p1 == p2.get();
 }

 template <class C>
 inline bool operator!=(const C* p1, const scoped_array<C>& p2) {
   return p1 != p2.get();
 }

 template <class C>
 inline bool operator!=(const C* p1, const scoped_array<const C>& p2) {
   return p1 != p2.get();
 }

 // This class wraps the c library function free() in a class that can be
 // passed as a template argument to scoped_ptr_malloc below.
 class ScopedPtrMallocFree {
  public:
   inline void operator()(void* x) const {
     free(x);
   }
 };

 // scoped_ptr_malloc<> is similar to scoped_ptr<>, but it accepts a
 // second template argument, the functor used to free the object.

 template<class C, class FreeProc = ScopedPtrMallocFree>
 class scoped_ptr_malloc {
  public:

   // The element type
   typedef C element_type;

   // Construction with no arguments sets ptr_ to NULL.
   // There is no way to create an uninitialized scoped_ptr.
   // The input parameter must be allocated with an allocator that matches the
   // Free functor.  For the default Free functor, this is malloc, calloc, or
   // realloc.
   explicit scoped_ptr_malloc(): ptr_(NULL) { }

   // Construct with a C*, and provides an error with a D*.
   template<class must_be_C>
   explicit scoped_ptr_malloc(must_be_C* p): ptr_(p) { }

   // Construct with a void*, such as you get from malloc.
   explicit scoped_ptr_malloc(void *p): ptr_(static_cast<C*>(p)) { }

   // Destructor.  If there is a C object, call the Free functor.
   ~scoped_ptr_malloc() {
     free_(ptr_);
   }

   // Reset.  Calls the Free functor on the current owned object, if any.
   // Then takes ownership of a new object, if given.
   // this->reset(this->get()) works.
   void reset(C* p = NULL) {
     if (ptr_ != p) {
       free_(ptr_);
       ptr_ = p;
     }
   }

   // Reallocates the existing pointer, and returns 'true' if
   // the reallcation is succesfull.  If the reallocation failed, then
   // the pointer remains in its previous state.
   //
   // Note: this calls realloc() directly, even if an alternate 'free'
   // functor is provided in the template instantiation.
   bool try_realloc(size_t new_size) {
     C* new_ptr = static_cast<C*>(realloc(ptr_, new_size));
     if (new_ptr == NULL) {
       return false;
     }
     ptr_ = new_ptr;
     return true;
   }

   // Get the current object.
   // operator* and operator-> will cause an assert() failure if there is
   // no current object.
   C& operator*() const {
     assert(ptr_ != NULL);
     return *ptr_;
   }

   C* operator->() const {
     assert(ptr_ != NULL);
     return ptr_;
   }

   C* get() const {
     return ptr_;
   }

   // Comparison operators.
   // These return whether a scoped_ptr_malloc and a plain pointer refer
   // to the same object, not just to two different but equal objects.
   // For compatibility with the boost-derived implementation, these
   // take non-const arguments.
   bool operator==(C* p) const {
     return ptr_ == p;
   }

   bool operator!=(C* p) const {
     return ptr_ != p;
   }

   // Swap two scoped pointers.
   void swap(scoped_ptr_malloc & b) {
     C* tmp = b.ptr_;
     b.ptr_ = ptr_;
     ptr_ = tmp;
   }

   // Release a pointer.
   // The return value is the current pointer held by this object.
   // If this object holds a NULL pointer, the return value is NULL.
   // After this operation, this object will hold a NULL pointer,
   // and will not own the object any more.
   C* release() {
     C* tmp = ptr_;
     ptr_ = NULL;
     return tmp;
   }

  private:
   C* ptr_;

   // no reason to use these: each scoped_ptr_malloc should have its own object
   template <class C2, class GP>
   bool operator==(scoped_ptr_malloc<C2, GP> const& p) const;
   template <class C2, class GP>
   bool operator!=(scoped_ptr_malloc<C2, GP> const& p) const;

   static FreeProc const free_;

   // Disallow evil constructors
   scoped_ptr_malloc(const scoped_ptr_malloc&);
   void operator=(const scoped_ptr_malloc&);
 };

 template<class C, class FP>
 FP const scoped_ptr_malloc<C, FP>::free_ = FP();

 template<class C, class FP> inline
 void swap(scoped_ptr_malloc<C, FP>& a, scoped_ptr_malloc<C, FP>& b) {
   a.swap(b);
 }

 template<class C, class FP> inline
 bool operator==(C* p, const scoped_ptr_malloc<C, FP>& b) {
   return p == b.get();
 }

 template<class C, class FP> inline
 bool operator!=(C* p, const scoped_ptr_malloc<C, FP>& b) {
   return p != b.get();
 }

 #endif  // BASE_SCOPED_PTR_H__
	// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#ifndef BASE_SCOPED_PTR_H__
	#define BASE_SCOPED_PTR_H__

	// This is an implementation designed to match the anticipated future TR2
	// implementation of the scoped_ptr class, and its closely-related brethren,
	// scoped_array, scoped_ptr_malloc, and make_scoped_ptr.
	//
	// See http://wiki/Main/ScopedPointerInterface for the spec that drove this
	// file.

	#include <assert.h>
	#include <stdlib.h>
	#include <cstddef>

	#ifdef OS_EMBEDDED_QNX
	// NOTE(akirmse):
	// The C++ standard says that <stdlib.h> declares both ::foo and std::foo
	// But this isn't done in QNX version 6.3.2 200709062316.
	using std::free;
	using std::malloc;
	using std::realloc;
	#endif

	template <class C> class scoped_ptr;
	template <class C, class Free> class scoped_ptr_malloc;
	template <class C> class scoped_array;

	template <class C>
	scoped_ptr<C> make_scoped_ptr(C *);

	// A scoped_ptr<T> is like a T*, except that the destructor of scoped_ptr<T>
	// automatically deletes the pointer it holds (if any).
	// That is, scoped_ptr<T> owns the T object that it points to.
	// Like a T*, a scoped_ptr<T> may hold either NULL or a pointer to a T object.
	// Also like T*, scoped_ptr<T> is thread-compatible, and once you
	// dereference it, you get the threadsafety guarantees of T.
	//
	// The size of a scoped_ptr is small:
	// sizeof(scoped_ptr<C>) == sizeof(C*)
	template <class C>
	class scoped_ptr {
	public:

	// The element type
	typedef C element_type;

	// Constructor. Defaults to intializing with NULL.
	// There is no way to create an uninitialized scoped_ptr.
	// The input parameter must be allocated with new.
	explicit scoped_ptr(C* p = NULL) : ptr_(p) { }

	// Destructor. If there is a C object, delete it.
	// We don't need to test ptr_ == NULL because C++ does that for us.
	~scoped_ptr() {
	enum { type_must_be_complete = sizeof(C) };
	delete ptr_;
	}

	// Reset. Deletes the current owned object, if any.
	// Then takes ownership of a new object, if given.
	// this->reset(this->get()) works.
	void reset(C* p = NULL) {
	if (p != ptr_) {
	enum { type_must_be_complete = sizeof(C) };
	delete ptr_;
	ptr_ = p;
	}
	}

	// Accessors to get the owned object.
	// operator* and operator-> will assert() if there is no current object.
	C& operator*() const {
	assert(ptr_ != NULL);
	return *ptr_;
	}
	C* operator->() const {
	assert(ptr_ != NULL);
	return ptr_;
	}
	C* get() const { return ptr_; }

	// Comparison operators.
	// These return whether a scoped_ptr and a raw pointer refer to
	// the same object, not just to two different but equal objects.
	bool operator==(const C* p) const { return ptr_ == p; }
	bool operator!=(const C* p) const { return ptr_ != p; }

	// Swap two scoped pointers.
	void swap(scoped_ptr& p2) {
	C* tmp = ptr_;
	ptr_ = p2.ptr_;
	p2.ptr_ = tmp;
	}

	// Release a pointer.
	// The return value is the current pointer held by this object.
	// If this object holds a NULL pointer, the return value is NULL.
	// After this operation, this object will hold a NULL pointer,
	// and will not own the object any more.
	C* release() {
	C* retVal = ptr_;
	ptr_ = NULL;
	return retVal;
	}

	private:
	C* ptr_;

	// google3 friend class that can access copy ctor (although if it actually
	// calls a copy ctor, there will be a problem) see below
	friend scoped_ptr<C> make_scoped_ptr<C>(C *p);

	// Forbid comparison of scoped_ptr types. If C2 != C, it totally doesn't
	// make sense, and if C2 == C, it still doesn't make sense because you should
	// never have the same object owned by two different scoped_ptrs.
	template <class C2> bool operator==(scoped_ptr<C2> const& p2) const;
	template <class C2> bool operator!=(scoped_ptr<C2> const& p2) const;

	// Disallow evil constructors
	scoped_ptr(const scoped_ptr&);
	void operator=(const scoped_ptr&);
	};

	// Free functions
	template <class C>
	inline void swap(scoped_ptr<C>& p1, scoped_ptr<C>& p2) {
	p1.swap(p2);
	}

	template <class C>
	inline bool operator==(const C* p1, const scoped_ptr<C>& p2) {
	return p1 == p2.get();
	}

	template <class C>
	inline bool operator==(const C* p1, const scoped_ptr<const C>& p2) {
	return p1 == p2.get();
	}

	template <class C>
	inline bool operator!=(const C* p1, const scoped_ptr<C>& p2) {
	return p1 != p2.get();
	}

	template <class C>
	inline bool operator!=(const C* p1, const scoped_ptr<const C>& p2) {
	return p1 != p2.get();
	}

	template <class C>
	scoped_ptr<C> make_scoped_ptr(C *p) {
	// This does nothing but to return a scoped_ptr of the type that the passed
	// pointer is of. (This eliminates the need to specify the name of T when
	// making a scoped_ptr that is used anonymously/temporarily.) From an
	// access control point of view, we construct an unnamed scoped_ptr here
	// which we return and thus copy-construct. Hence, we need to have access
	// to scoped_ptr::scoped_ptr(scoped_ptr const &). However, it is guaranteed
	// that we never actually call the copy constructor, which is a good thing
	// as we would call the temporary's object destructor (and thus delete p)
	// if we actually did copy some object, here.
	return scoped_ptr<C>(p);
	}

	// scoped_array<C> is like scoped_ptr<C>, except that the caller must allocate
	// with new [] and the destructor deletes objects with delete [].
	//
	// As with scoped_ptr<C>, a scoped_array<C> either points to an object
	// or is NULL. A scoped_array<C> owns the object that it points to.
	// scoped_array<T> is thread-compatible, and once you index into it,
	// the returned objects have only the threadsafety guarantees of T.
	//
	// Size: sizeof(scoped_array<C>) == sizeof(C*)
	template <class C>
	class scoped_array {
	public:

	// The element type
	typedef C element_type;

	// Constructor. Defaults to intializing with NULL.
	// There is no way to create an uninitialized scoped_array.
	// The input parameter must be allocated with new [].
	explicit scoped_array(C* p = NULL) : array_(p) { }

	// Destructor. If there is a C object, delete it.
	// We don't need to test ptr_ == NULL because C++ does that for us.
	~scoped_array() {
	enum { type_must_be_complete = sizeof(C) };
	delete[] array_;
	}

	// Reset. Deletes the current owned object, if any.
	// Then takes ownership of a new object, if given.
	// this->reset(this->get()) works.
	void reset(C* p = NULL) {
	if (p != array_) {
	enum { type_must_be_complete = sizeof(C) };
	delete[] array_;
	array_ = p;
	}
	}

	// Get one element of the current object.
	// Will assert() if there is no current object, or index i is negative.
	C& operator[](std::ptrdiff_t i) const {
	assert(i >= 0);
	assert(array_ != NULL);
	return array_[i];
	}

	// Get a pointer to the zeroth element of the current object.
	// If there is no current object, return NULL.
	C* get() const {
	return array_;
	}

	// Comparison operators.
	// These return whether a scoped_array and a raw pointer refer to
	// the same array, not just to two different but equal arrays.
	bool operator==(const C* p) const { return array_ == p; }
	bool operator!=(const C* p) const { return array_ != p; }

	// Swap two scoped arrays.
	void swap(scoped_array& p2) {
	C* tmp = array_;
	array_ = p2.array_;
	p2.array_ = tmp;
	}

	// Release an array.
	// The return value is the current pointer held by this object.
	// If this object holds a NULL pointer, the return value is NULL.
	// After this operation, this object will hold a NULL pointer,
	// and will not own the object any more.
	C* release() {
	C* retVal = array_;
	array_ = NULL;
	return retVal;
	}

	private:
	C* array_;

	// Forbid comparison of different scoped_array types.
	template <class C2> bool operator==(scoped_array<C2> const& p2) const;
	template <class C2> bool operator!=(scoped_array<C2> const& p2) const;

	// Disallow evil constructors
	scoped_array(const scoped_array&);
	void operator=(const scoped_array&);
	};

	// Free functions
	template <class C>
	inline void swap(scoped_array<C>& p1, scoped_array<C>& p2) {
	p1.swap(p2);
	}

	template <class C>
	inline bool operator==(const C* p1, const scoped_array<C>& p2) {
	return p1 == p2.get();
	}

	template <class C>
	inline bool operator==(const C* p1, const scoped_array<const C>& p2) {
	return p1 == p2.get();
	}

	template <class C>
	inline bool operator!=(const C* p1, const scoped_array<C>& p2) {
	return p1 != p2.get();
	}

	template <class C>
	inline bool operator!=(const C* p1, const scoped_array<const C>& p2) {
	return p1 != p2.get();
	}

	// This class wraps the c library function free() in a class that can be
	// passed as a template argument to scoped_ptr_malloc below.
	class ScopedPtrMallocFree {
	public:
	inline void operator()(void* x) const {
	free(x);
	}
	};

	// scoped_ptr_malloc<> is similar to scoped_ptr<>, but it accepts a
	// second template argument, the functor used to free the object.

	template<class C, class FreeProc = ScopedPtrMallocFree>
	class scoped_ptr_malloc {
	public:

	// The element type
	typedef C element_type;

	// Construction with no arguments sets ptr_ to NULL.
	// There is no way to create an uninitialized scoped_ptr.
	// The input parameter must be allocated with an allocator that matches the
	// Free functor. For the default Free functor, this is malloc, calloc, or
	// realloc.
	explicit scoped_ptr_malloc(): ptr_(NULL) { }

	// Construct with a C, and provides an error with a D.
	template<class must_be_C>
	explicit scoped_ptr_malloc(must_be_C* p): ptr_(p) { }

	// Construct with a void*, such as you get from malloc.
	explicit scoped_ptr_malloc(void p): ptr_(static_cast<C>(p)) { }

	// Destructor. If there is a C object, call the Free functor.
	~scoped_ptr_malloc() {
	free_(ptr_);
	}

	// Reset. Calls the Free functor on the current owned object, if any.
	// Then takes ownership of a new object, if given.
	// this->reset(this->get()) works.
	void reset(C* p = NULL) {
	if (ptr_ != p) {
	free_(ptr_);
	ptr_ = p;
	}
	}

	// Reallocates the existing pointer, and returns 'true' if
	// the reallcation is succesfull. If the reallocation failed, then
	// the pointer remains in its previous state.
	//
	// Note: this calls realloc() directly, even if an alternate 'free'
	// functor is provided in the template instantiation.
	bool try_realloc(size_t new_size) {
	C* new_ptr = static_cast<C*>(realloc(ptr_, new_size));
	if (new_ptr == NULL) {
	return false;
	}
	ptr_ = new_ptr;
	return true;
	}

	// Get the current object.
	// operator* and operator-> will cause an assert() failure if there is
	// no current object.
	C& operator*() const {
	assert(ptr_ != NULL);
	return *ptr_;
	}

	C* operator->() const {
	assert(ptr_ != NULL);
	return ptr_;
	}

	C* get() const {
	return ptr_;
	}

	// Comparison operators.
	// These return whether a scoped_ptr_malloc and a plain pointer refer
	// to the same object, not just to two different but equal objects.
	// For compatibility with the boost-derived implementation, these
	// take non-const arguments.
	bool operator==(C* p) const {
	return ptr_ == p;
	}

	bool operator!=(C* p) const {
	return ptr_ != p;
	}

	// Swap two scoped pointers.
	void swap(scoped_ptr_malloc & b) {
	C* tmp = b.ptr_;
	b.ptr_ = ptr_;
	ptr_ = tmp;
	}

	// Release a pointer.
	// The return value is the current pointer held by this object.
	// If this object holds a NULL pointer, the return value is NULL.
	// After this operation, this object will hold a NULL pointer,
	// and will not own the object any more.
	C* release() {
	C* tmp = ptr_;
	ptr_ = NULL;
	return tmp;
	}

	private:
	C* ptr_;

	// no reason to use these: each scoped_ptr_malloc should have its own object
	template <class C2, class GP>
	bool operator==(scoped_ptr_malloc<C2, GP> const& p) const;
	template <class C2, class GP>
	bool operator!=(scoped_ptr_malloc<C2, GP> const& p) const;

	static FreeProc const free_;

	// Disallow evil constructors
	scoped_ptr_malloc(const scoped_ptr_malloc&);
	void operator=(const scoped_ptr_malloc&);
	};

	template<class C, class FP>
	FP const scoped_ptr_malloc<C, FP>::free_ = FP();

	template<class C, class FP> inline
	void swap(scoped_ptr_malloc<C, FP>& a, scoped_ptr_malloc<C, FP>& b) {
	a.swap(b);
	}

	template<class C, class FP> inline
	bool operator==(C* p, const scoped_ptr_malloc<C, FP>& b) {
	return p == b.get();
	}

	template<class C, class FP> inline
	bool operator!=(C* p, const scoped_ptr_malloc<C, FP>& b) {
	return p != b.get();
	}

	#endif // BASE_SCOPED_PTR_H__