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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "opentelemetry/metrics/observer_result.h"
#include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace metrics
{
using ObservableCallbackPtr = void (*)(ObserverResult, void *);
class ObservableInstrument
{
public:
ObservableInstrument() = default;
ObservableInstrument(const ObservableInstrument &) = default;
ObservableInstrument(ObservableInstrument &&) noexcept = default;
ObservableInstrument &operator=(const ObservableInstrument &) = default;
ObservableInstrument &operator=(ObservableInstrument &&) noexcept = default;
virtual ~ObservableInstrument() = default;
/**
* Sets up a function that will be called whenever a metric collection is initiated.
*/
virtual void AddCallback(ObservableCallbackPtr, void *state) noexcept = 0;
/**
* Remove a function that was configured to be called whenever a metric collection is initiated.
*/
virtual void RemoveCallback(ObservableCallbackPtr, void *state) noexcept = 0;
};
} // namespace metrics
OPENTELEMETRY_END_NAMESPACE
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