Program Listing for File async_instruments.h

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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;

  virtual void AddCallback(ObservableCallbackPtr, void *state) noexcept = 0;

  virtual void RemoveCallback(ObservableCallbackPtr, void *state) noexcept = 0;
};

}  // namespace metrics
OPENTELEMETRY_END_NAMESPACE