Move ScopedFILE to base namespace and scoped_file.h

base/files/scoped_file.h

 // Copyright 2014 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_FILES_SCOPED_FILE_H_
 #define BASE_FILES_SCOPED_FILE_H_
 
 #include <stdio.h>
 
 #include "base/base_export.h"
 #include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/scoped_generic.h"
 #include "build/build_config.h"
 
 namespace base {
 
 namespace internal {
 
 #if defined(OS_POSIX)
 struct BASE_EXPORT ScopedFDCloseTraits {
   static int InvalidValue() {
     return -1;
   }
   static void Free(int fd);
 };
 #endif
 
+// Functor for |ScopedFILE| (below).
+struct ScopedFILECloser {
+  inline void operator()(FILE* x) const {
+    if (x)
+      fclose(x);
+  }
+};
+
 }  // namespace internal
 
+// -----------------------------------------------------------------------------
+
 #if defined(OS_POSIX)
 // A low-level Posix file descriptor closer class. Use this when writing
 // platform-specific code, especially that does non-file-like things with the
 // FD (like sockets).
 //
 // If you're writing low-level Windows code, see base/win/scoped_handle.h
 // which provides some additional functionality.
 //
 // If you're writing cross-platform code that deals with actual files, you
 // should generally use base::File instead which can be constructed with a
 // handle, and in addition to handling ownership, has convenient cross-platform
 // file manipulation functions on it.
 typedef ScopedGeneric<int, internal::ScopedFDCloseTraits> ScopedFD;
 #endif
 
+// Automatically closes |FILE*|s.
+typedef scoped_ptr<FILE, internal::ScopedFILECloser> ScopedFILE;
+
 }  // namespace base
 
 #endif  // BASE_FILES_SCOPED_FILE_H_