Create a new print backend for the updated CUPS APIs

printing/backend/cups_deleters.h

+// Copyright 2016 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 PRINTING_BACKEND_CUPS_DELETERS_H_
+#define PRINTING_BACKEND_CUPS_DELETERS_H_
+
+#include <cups/cups.h>
+
+namespace printing {
+
+class HttpDeleter {

[Lei Zhang, 2016/07/19 19:32:58]

Can we make these structs and avoid all the default ctors? See
base/memory/free_deleter.h and base/files/scoped_file.h for examples of other
deleters/closers. Forgot to mention this earlier.

[skau, 2016/07/20 23:58:22]

Done.

+ public:
+  HttpDeleter() = default;
+  HttpDeleter(const HttpDeleter& deleter) = default;
+
+  HttpDeleter& operator=(const HttpDeleter& deleter) = default;
+
+  void operator()(http_t* http) const;
+};
+
+class DestinationDeleter {
+ public:
+  DestinationDeleter() = default;
+  DestinationDeleter(const DestinationDeleter& deleter) = default;
+
+  DestinationDeleter& operator=(const DestinationDeleter& deleter) = default;
+
+  void operator()(cups_dest_t* dest) const;
+};
+
+class DestInfoDeleter {
+ public:
+  DestInfoDeleter() = default;
+  DestInfoDeleter(const DestInfoDeleter& deleter) = default;
+
+  DestInfoDeleter& operator=(const DestInfoDeleter& deleter) = default;
+
+  void operator()(cups_dinfo_t* info) const;
+};
+
+}  // namespace printing
+
+#endif  // PRINTING_BACKEND_CUPS_DELETERS_H_