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87 lines
2.1 KiB
87 lines
2.1 KiB
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MOJO_PUBLIC_CPP_BINDINGS_CLONE_TRAITS_H_
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#define MOJO_PUBLIC_CPP_BINDINGS_CLONE_TRAITS_H_
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#include <type_traits>
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#include <vector>
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#include "base/containers/flat_map.h"
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#include "base/optional.h"
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#include "mojo/public/cpp/bindings/lib/template_util.h"
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namespace mojo {
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template <typename T>
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struct HasCloneMethod {
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template <typename U>
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static char Test(decltype(&U::Clone));
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template <typename U>
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static int Test(...);
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static const bool value = sizeof(Test<T>(0)) == sizeof(char);
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private:
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internal::EnsureTypeIsComplete<T> check_t_;
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};
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template <typename T, bool has_clone_method = HasCloneMethod<T>::value>
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struct CloneTraits;
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template <typename T>
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T Clone(const T& input);
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template <typename T>
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struct CloneTraits<T, true> {
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static T Clone(const T& input) { return input.Clone(); }
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};
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template <typename T>
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struct CloneTraits<T, false> {
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static T Clone(const T& input) { return input; }
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};
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template <typename T>
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struct CloneTraits<base::Optional<T>, false> {
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static base::Optional<T> Clone(const base::Optional<T>& input) {
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if (!input)
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return base::nullopt;
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return base::Optional<T>(mojo::Clone(*input));
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}
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};
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template <typename T>
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struct CloneTraits<std::vector<T>, false> {
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static std::vector<T> Clone(const std::vector<T>& input) {
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std::vector<T> result;
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result.reserve(input.size());
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for (const auto& element : input)
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result.push_back(mojo::Clone(element));
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return result;
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}
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};
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template <typename K, typename V>
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struct CloneTraits<base::flat_map<K, V>, false> {
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static base::flat_map<K, V> Clone(const base::flat_map<K, V>& input) {
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base::flat_map<K, V> result;
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for (const auto& element : input) {
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result.insert(std::make_pair(mojo::Clone(element.first),
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mojo::Clone(element.second)));
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}
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return result;
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}
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};
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template <typename T>
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T Clone(const T& input) {
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return CloneTraits<T>::Clone(input);
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};
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} // namespace mojo
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#endif // MOJO_PUBLIC_CPP_BINDINGS_CLONE_TRAITS_H_
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