Move base::FreeDeleter into its own header.

base/memory/scoped_ptr.h

 // Copyright (c) 2012 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 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 correspond to the
 // operators new/delete and new[]/delete[].
 //
 // Example usage (scoped_ptr<T>):
@@ skipping 74 matching lines @@
 //   scoped_ptr<FooParent> parent(std::move(foo));
 
 #ifndef BASE_MEMORY_SCOPED_PTR_H_
 #define BASE_MEMORY_SCOPED_PTR_H_
 
 // This is an implementation designed to match the anticipated future TR2
 // implementation of the scoped_ptr class.
 
 // TODO(dcheng): Clean up these headers, but there are likely lots of existing
 // IWYU violations.
 #include <stdlib.h>

[dcheng, 2016/03/25 21:59:37]

FYI, I'm planning on cleaning this up in a followup patch to keep things
simpler.

 
 #include <memory>
 
-namespace base {
-
-// Function object which invokes 'free' on its parameter, which must be
-// a pointer. Can be used to store malloc-allocated pointers in scoped_ptr:
-//
-// scoped_ptr<int, base::FreeDeleter> foo_ptr(
-//     static_cast<int*>(malloc(sizeof(int))));
-struct FreeDeleter {
-  inline void operator()(void* ptr) const {
-    free(ptr);
-  }
-};
-
-}  // namespace base
-
 template <typename T, typename D = std::default_delete<T>>
 using scoped_ptr = std::unique_ptr<T, D>;
 
 // A function to convert T* into scoped_ptr<T>
 // Doing e.g. make_scoped_ptr(new FooBarBaz<type>(arg)) is a shorter notation
 // for scoped_ptr<FooBarBaz<type> >(new FooBarBaz<type>(arg))
 template <typename T>
 scoped_ptr<T> make_scoped_ptr(T* ptr) {
   return scoped_ptr<T>(ptr);
 }
 
 #endif  // BASE_MEMORY_SCOPED_PTR_H_