Incomplete changes to make scoped_ptr_malloc use plain functions.

base/scoped_ptr.h

 // Copyright (c) 2006-2008 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.
 
 // Scopers help you manage ownership of a pointer, helping you easily manage the
 // a pointer within a scope, and automatically destroying the pointer at the
 // end of a scope.  There are two main classes you will use, which coorespond
 // to the operators new/delete and new[]/delete[].
 //
 // Example usage (scoped_ptr):
@@ skipping 238 matching lines @@
 template <class C>
 bool operator==(C* p1, const scoped_array<C>& p2) {
   return p1 == p2.get();
 }
 
 template <class C>
 bool operator!=(C* p1, const scoped_array<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);
-  }
-};
+// This template function will adapt any function that takes a void* and
+// returns void for use with scoped_ptr_malloc below.
+template<void (*FreeFn)(void*), class C>
+void FreeFnAdapter(C* x) {
+  FreeFn(x);
+}
+template<int (*FreeFn)(void*), class C>
+void FreeFnAdapterIgnoreReturn(C* x) {
+  FreeFn(x);
+}
+template<class C, int (*FreeFn)(C*)>
+void FreeFnIgnoreReturn(C* x) {
+  FreeFn(x);
+}
 
 // scoped_ptr_malloc<> is similar to scoped_ptr<>, but it accepts a
-// second template argument, the functor used to free the object.
+// second template argument, the function used to free the object.
 
-template<class C, class FreeProc = ScopedPtrMallocFree>
+template<class C, void (*FreeProc)(C*) = FreeFnAdapter<free> >
 class scoped_ptr_malloc {
  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 an allocator that matches the
   // Free functor.  For the default Free functor, this is malloc, calloc, or
   // realloc.
   explicit scoped_ptr_malloc(C* p = NULL): ptr_(p) {}
 
   // Destructor.  If there is a C object, call the Free functor.
   ~scoped_ptr_malloc() {
-    free_(ptr_);
+    FreePointer(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_);
+      FreePointer(ptr_);
       ptr_ = p;
     }
   }
 
   // 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_;
@@ skipping 33 matching lines @@
   // 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() WARN_UNUSED_RESULT {
     C* tmp = ptr_;
     ptr_ = NULL;
     return tmp;
   }
 
  private:
+  void FreePointer(C* x) {
+    if (x)
+      FreeProc(x);
+  }
   C* ptr_;
 
   // no reason to use these: each scoped_ptr_malloc should have its own object
-  template <class C2, class GP>
+  template <class C2, void GP(C*)>
   bool operator==(scoped_ptr_malloc<C2, GP> const& p) const;
-  template <class C2, class GP>
+  template <class C2, void GP(C*)>
   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
+template<class C, void FP(C*)> inline
 void swap(scoped_ptr_malloc<C, FP>& a, scoped_ptr_malloc<C, FP>& b) {
   a.swap(b);
 }
 
-template<class C, class FP> inline
+template<class C, void FP(C*)> inline
 bool operator==(C* p, const scoped_ptr_malloc<C, FP>& b) {
   return p == b.get();
 }
 
-template<class C, class FP> inline
+template<class C, void FP(C*)> inline
 bool operator!=(C* p, const scoped_ptr_malloc<C, FP>& b) {
   return p != b.get();
 }
 
 #endif  // BASE_SCOPED_PTR_H_