.. _program_listing_file_include_opentelemetry_trace_propagation_detail_context.h:

Program Listing for File context.h
==================================

|exhale_lsh| :ref:`Return to documentation for file <file_include_opentelemetry_trace_propagation_detail_context.h>` (``include/opentelemetry/trace/propagation/detail/context.h``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #pragma once
   #include "opentelemetry/context/context.h"
   #include "opentelemetry/trace/default_span.h"
   
   OPENTELEMETRY_BEGIN_NAMESPACE
   namespace trace
   {
   namespace propagation
   {
   
   inline nostd::shared_ptr<trace::Span> GetSpan(const context::Context &context)
   {
     context::ContextValue span = context.GetValue(trace::kSpanKey);
     if (nostd::holds_alternative<nostd::shared_ptr<trace::Span>>(span))
     {
       return nostd::get<nostd::shared_ptr<trace::Span>>(span);
     }
     return nostd::shared_ptr<trace::Span>(new DefaultSpan(SpanContext::GetInvalid()));
   }
   
   inline context::Context SetSpan(context::Context &context, nostd::shared_ptr<trace::Span> span)
   {
   
     return context.SetValue(kSpanKey, span);
   }
   
   }  // namespace propagation
   }  // namespace trace
   OPENTELEMETRY_END_NAMESPACE