--- /dev/null
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+#ifndef ENABLE_METRICS_PREVIEW
+# include "opentelemetry/common/spin_lock_mutex.h"
+# include "opentelemetry/sdk/metrics/aggregation/aggregation.h"
+
+# include <mutex>
+
+OPENTELEMETRY_BEGIN_NAMESPACE
+namespace sdk
+{
+namespace metrics
+{
+
+class LongSumAggregation : public Aggregation
+{
+public:
+ LongSumAggregation();
+ LongSumAggregation(SumPointData &&);
+ LongSumAggregation(const SumPointData &);
+
+ void Aggregate(long value, const PointAttributes &attributes = {}) noexcept override;
+
+ void Aggregate(double value, const PointAttributes &attributes = {}) noexcept override {}
+
+ std::unique_ptr<Aggregation> Merge(const Aggregation &delta) const noexcept override;
+
+ std::unique_ptr<Aggregation> Diff(const Aggregation &next) const noexcept override;
+
+ PointType ToPoint() const noexcept override;
+
+private:
+ opentelemetry::common::SpinLockMutex lock_;
+ SumPointData point_data_;
+};
+
+class DoubleSumAggregation : public Aggregation
+{
+public:
+ DoubleSumAggregation();
+ DoubleSumAggregation(SumPointData &&);
+ DoubleSumAggregation(const SumPointData &);
+
+ void Aggregate(long value, const PointAttributes &attributes = {}) noexcept override {}
+
+ void Aggregate(double value, const PointAttributes &attributes = {}) noexcept override;
+
+ std::unique_ptr<Aggregation> Merge(const Aggregation &delta) const noexcept override;
+
+ std::unique_ptr<Aggregation> Diff(const Aggregation &next) const noexcept override;
+
+ PointType ToPoint() const noexcept override;
+
+private:
+ mutable opentelemetry::common::SpinLockMutex lock_;
+ SumPointData point_data_;
+};
+
+} // namespace metrics
+} // namespace sdk
+OPENTELEMETRY_END_NAMESPACE
+#endif
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