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Unified Diff: mojo/public/cpp/bindings/map_traits_stl.h

Issue 2014403002: Mojo C++ bindings: custom type mapping of map (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 7 months ago
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Index: mojo/public/cpp/bindings/map_traits_stl.h
diff --git a/mojo/public/cpp/bindings/map_traits_stl.h b/mojo/public/cpp/bindings/map_traits_stl.h
new file mode 100644
index 0000000000000000000000000000000000000000..25ae65a8384108e7277bce3e3dfce81543ed8c18
--- /dev/null
+++ b/mojo/public/cpp/bindings/map_traits_stl.h
@@ -0,0 +1,59 @@
+// 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 MOJO_PUBLIC_CPP_BINDINGS_MAP_TRAITS_STL_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_MAP_TRAITS_STL_H_
+
+#include <map>
+
+#include "mojo/public/cpp/bindings/map_traits.h"
+
+namespace mojo {
+
+template <typename K, typename V>
+struct MapTraits<std::map<K, V>> {
+ using Key = K;
+ using Value = V;
+ using Iterator = typename std::map<K, V>::iterator;
+ using ConstIterator = typename std::map<K, V>::const_iterator;
+
+ static bool IsNull(const std::map<K, V>& input) {
+ // std::map<> is always converted to non-null mojom map.
+ return false;
+ }
+
+ static void SetToNull(std::map<K, V>* output) {
+ // std::map<> doesn't support null state. Set it to empty instead.
+ output->clear();
+ }
+
+ static size_t GetSize(const std::map<K, V>& input) { return input.size(); }
+
+ static ConstIterator GetBegin(const std::map<K, V>& input) {
+ return input.begin();
+ }
+ static Iterator GetBegin(std::map<K, V>& input) { return input.begin(); }
+
+ static void AdvanceIterator(ConstIterator& iterator) { iterator++; }
+ static void AdvanceIterator(Iterator& iterator) { iterator++; }
+
+ static const K& GetKey(Iterator& iterator) { return iterator->first; }
+ static const K& GetKey(ConstIterator& iterator) { return iterator->first; }
+
+ static V& GetValue(Iterator& iterator) { return iterator->second; }
+ static const V& GetValue(ConstIterator& iterator) { return iterator->second; }
+
+ static void Insert(std::map<K, V>& input, const K& key, V&& value) {
+ input.insert(std::make_pair(key, std::forward<V>(value)));
+ }
+ static void Insert(std::map<K, V>& input, const K& key, const V& value) {
+ input.insert(std::make_pair(key, value));
+ }
+
+ static void SetToEmpty(std::map<K, V>* output) { output->clear(); }
+};
+
+} // namespace mojo
+
+#endif // MOJO_PUBLIC_CPP_BINDINGS_MAP_TRAITS_STL_H_
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