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// Copyright 2025 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_UI_UNOWNED_USER_DATA_UNOWNED_USER_DATA_HOST_H_
#define CHROME_BROWSER_UI_UNOWNED_USER_DATA_UNOWNED_USER_DATA_HOST_H_
#include <map>
#include "base/types/pass_key.h"
namespace internal {
class ScopedUnownedUserDataBase;
}
// This class is a holder for UnownedUserData. There can be only a single entry
// per key, per host. The host must outlive the UnownedUserData. The methods on
// this class should not be used directly, since features should instead be
// retrieved via getters on the individual feature classes.
class UnownedUserDataHost {
public:
UnownedUserDataHost();
~UnownedUserDataHost();
// Sets the entry in the map for the given `key` to `data`.
// CHECKs that there is no existing entry.
void Set(base::PassKey<internal::ScopedUnownedUserDataBase> pass_key,
const char* key,
void* data);
// Erases the entry in the map for the given `key`.
// CHECKs that there *is* an existing entry in the map.
void Erase(base::PassKey<internal::ScopedUnownedUserDataBase> pass_key,
const char* key);
// Returns the entry in the map for the given `key`, or null if one does not
// exist.
void* Get(base::PassKey<internal::ScopedUnownedUserDataBase>,
const char* key);
private:
std::map<const char*, void*> map_;
};
#endif // CHROME_BROWSER_UI_UNOWNED_USER_DATA_UNOWNED_USER_DATA_HOST_H_
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