includes/opentelemetry/metrics/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;
  virtual ~ObservableInstrument() = default;
 
  virtual void AddCallback(ObservableCallbackPtr, void *state) noexcept = 0;
 
  virtual void RemoveCallback(ObservableCallbackPtr, void *state) noexcept = 0;
};
 
}  // namespace metrics
OPENTELEMETRY_END_NAMESPACE