From 06fce9b0ac437fbf94d320c3c31567afb4316b0d Mon Sep 17 00:00:00 2001
From: Matt Eastman <matt@meastman.org>
Date: Wed, 21 Nov 2018 15:09:32 -0600
Subject: [PATCH] Implement SpanContext::Clone

This was added to the opentracing API in
https://github.com/opentracing/opentracing-cpp/pull/56

Signed-off-by: Matt Eastman <matt@meastman.org>
---
 src/jaegertracing/SpanContext.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/jaegertracing/SpanContext.h b/src/jaegertracing/SpanContext.h
index df78400a..20a1f787 100644
--- a/src/jaegertracing/SpanContext.h
+++ b/src/jaegertracing/SpanContext.h
@@ -19,6 +19,7 @@
 
 #include <iomanip>
 #include <iostream>
+#include <memory>
 #include <mutex>
 #include <string>
 #include <unordered_map>
@@ -164,6 +165,13 @@ class SpanContext : public opentracing::SpanContext {
         forEachBaggageItem(f);
     }
 
+    std::unique_ptr<opentracing::SpanContext> Clone() const noexcept
+    {
+        std::lock_guard<std::mutex> lock(_mutex);
+        return std::unique_ptr<opentracing::SpanContext>(
+            new SpanContext(*this));
+    }
+
     friend bool operator==(const SpanContext& lhs, const SpanContext& rhs)
     {
         {