9.2/includes/opentelemetry/baggage/baggage_context.h

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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
 
#pragma once
 
#include "opentelemetry/baggage/baggage.h"
#include "opentelemetry/context/context.h"
#include "opentelemetry/nostd/shared_ptr.h"
#include "opentelemetry/version.h"
 
OPENTELEMETRY_BEGIN_NAMESPACE
 
namespace baggage
{
 
static const std::string kBaggageHeader = "baggage";
 
inline nostd::shared_ptr<Baggage> GetBaggage(const context::Context &context) noexcept
{
  context::ContextValue context_value = context.GetValue(kBaggageHeader);
  if (nostd::holds_alternative<nostd::shared_ptr<Baggage>>(context_value))
  {
    return nostd::get<nostd::shared_ptr<Baggage>>(context_value);
  }
  static nostd::shared_ptr<Baggage> empty_baggage{new Baggage()};
  return empty_baggage;
}
 
inline context::Context SetBaggage(context::Context &context,
                                   const nostd::shared_ptr<Baggage> &baggage) noexcept
{
  return context.SetValue(kBaggageHeader, baggage);
}
 
}  // namespace baggage
OPENTELEMETRY_END_NAMESPACE