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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TEST_COPY_ONLY_INT_H_
#define BASE_TEST_COPY_ONLY_INT_H_
#include <utility>
#include "base/functional/callback.h"
#include "third_party/abseil-cpp/absl/cleanup/cleanup.h"
namespace base {
// A copy-only (not moveable) class that holds an integer. This is designed for
// testing containers. See also MoveOnlyInt.
class CopyOnlyInt {
public:
explicit CopyOnlyInt(int data = 1) : data_(data) {}
CopyOnlyInt(const CopyOnlyInt& other) : data_(other.data_) { ++num_copies_; }
~CopyOnlyInt();
friend bool operator==(const CopyOnlyInt& lhs,
const CopyOnlyInt& rhs) = default;
friend auto operator<=>(const CopyOnlyInt& lhs,
const CopyOnlyInt& rhs) = default;
int data() const { return data_; }
static void reset_num_copies() { num_copies_ = 0; }
static int num_copies() { return num_copies_; }
// Called with the value of `data()` when an instance of `CopyOnlyInt` is
// destroyed. Returns an `absl::Cleanup` scoper that automatically
// unregisters the callback when the scoper is destroyed.
static auto SetScopedDestructionCallback(
RepeatingCallback<void(int)> callback) {
GetDestructionCallbackStorage() = std::move(callback);
return absl::Cleanup([] { GetDestructionCallbackStorage().Reset(); });
}
private:
static RepeatingCallback<void(int)>& GetDestructionCallbackStorage();
volatile int data_;
static int num_copies_;
CopyOnlyInt(CopyOnlyInt&&) = delete;
CopyOnlyInt& operator=(CopyOnlyInt&) = delete;
};
} // namespace base
#endif // BASE_TEST_COPY_ONLY_INT_H_
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