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      1 // Copyright 2014 The Chromium OS Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef LIBBRILLO_BRILLO_VARIANT_DICTIONARY_H_
      6 #define LIBBRILLO_BRILLO_VARIANT_DICTIONARY_H_
      7 
      8 #include <map>
      9 #include <string>
     10 
     11 #include <brillo/any.h>
     12 #include <brillo/brillo_export.h>
     13 
     14 namespace brillo {
     15 
     16 using VariantDictionary = std::map<std::string, brillo::Any>;
     17 
     18 // GetVariantValueOrDefault tries to retrieve the named key from the dictionary
     19 // and convert it to the type T.  If the value does not exist, or the type
     20 // conversion fails, the default value of type T is returned.
     21 template<typename T>
     22 const T GetVariantValueOrDefault(const VariantDictionary& dictionary,
     23                                  const std::string& key) {
     24   VariantDictionary::const_iterator it = dictionary.find(key);
     25   if (it == dictionary.end()) {
     26     return T();
     27   }
     28   return it->second.TryGet<T>();
     29 }
     30 
     31 }  // namespace brillo
     32 
     33 #endif  // LIBBRILLO_BRILLO_VARIANT_DICTIONARY_H_
     34