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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_APPS_BROWSER_INSTANCE_BROWSER_APP_INSTANCE_MAP_H_
#define CHROME_BROWSER_APPS_BROWSER_INSTANCE_BROWSER_APP_INSTANCE_MAP_H_
#include <algorithm>
#include <map>
#include <memory>
#include <set>
#include <utility>
#include "base/check.h"
#include "base/containers/contains.h"
namespace apps {
template <typename KeyT, typename ValueT>
using BrowserAppInstanceMap = std::map<KeyT, std::unique_ptr<ValueT>>;
template <typename KeyT, typename ValueT>
ValueT& AddInstance(BrowserAppInstanceMap<KeyT, ValueT>& instances,
const KeyT& key,
std::unique_ptr<ValueT> instance) {
DCHECK(!base::Contains(instances, key));
auto it = instances.insert(std::make_pair(key, std::move(instance)));
return *it.first->second;
}
template <typename KeyT, typename ValueT>
std::unique_ptr<ValueT> PopInstanceIfExists(
BrowserAppInstanceMap<KeyT, ValueT>& instances,
const KeyT& key) {
auto it = instances.find(key);
if (it == instances.end()) {
return nullptr;
}
auto instance = std::move(it->second);
instances.erase(it);
return instance;
}
template <typename KeyT, typename ValueT>
ValueT* GetInstance(const BrowserAppInstanceMap<KeyT, ValueT>& instances,
const KeyT& key) {
auto it = instances.find(key);
return (it == instances.end()) ? nullptr : it->second.get();
}
template <typename KeyT, typename ValueT, typename PredicateT>
void SelectInstances(std::set<const ValueT*>& result,
const BrowserAppInstanceMap<KeyT, ValueT>& instances,
PredicateT predicate) {
for (const auto& pair : instances) {
const ValueT& instance = *pair.second;
if (predicate(instance)) {
result.insert(&instance);
}
}
}
template <typename KeyT, typename ValueT, typename PredicateT>
const ValueT* FindInstanceIf(
const BrowserAppInstanceMap<KeyT, ValueT>& instances,
PredicateT predicate) {
auto it = std::ranges::find_if(
instances, predicate,
[](const auto& pair) -> const ValueT& { return *pair.second; });
if (it == instances.end()) {
return nullptr;
}
return it->second.get();
}
} // namespace apps
#endif // CHROME_BROWSER_APPS_BROWSER_INSTANCE_BROWSER_APP_INSTANCE_MAP_H_
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