AU: ApplyMap utility function

utils.h

 // Copyright (c) 2010 The Chromium OS 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 CHROMEOS_PLATFORM_UPDATE_ENGINE_UTILS_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_UTILS_H__
 
 #include <errno.h>
 
 #include <algorithm>
@@ skipping 164 matching lines @@
                                                          vect.end(),
                                                          value);
   if (it == vect.end()) {
     return false;
   } else {
     *out_index = it - vect.begin();
     return true;
   }
 }
 
+template<typename ValueType>
+void ApplyMap(std::vector<ValueType>* collection,
+              const std::map<ValueType, ValueType>& the_map) {
+  for (typename std::vector<ValueType>::iterator it = collection->begin();
+       it != collection->end(); ++it) {
+    typename std::map<ValueType, ValueType>::const_iterator map_it =
+      the_map.find(*it);
+    if (map_it != the_map.end()) {
+      *it = map_it->second;
+    }
+  }
+}
+
 // Returns the currently booted device. "/dev/sda3", for example.
 // This will not interpret LABEL= or UUID=. You'll need to use findfs
 // or something with equivalent funcionality to interpret those.
 const std::string BootDevice();
 
 // Returns the currently booted kernel device, "dev/sda2", for example.
 // Client must pass in the boot device. The suggested calling convention
 // is: BootKernelDevice(BootDevice()).
 // This function works by doing string modification on boot_device.
 // Returns empty string on failure.
@@ skipping 142 matching lines @@
     bool _success = (_x);                                                      \
     if (!_success) {                                                           \
       LOG(ERROR) << #_x " failed.";                                            \
       return;                                                                  \
     }                                                                          \
   } while (0)
 
 
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_UTILS_H__