update ceph source to reef 18.1.2

[ceph.git] / ceph / src / jaegertracing / opentelemetry-cpp / exporters / ostream / include / opentelemetry / exporters / ostream / common_utils.h

diff --git a/ceph/src/jaegertracing/opentelemetry-cpp/exporters/ostream/include/opentelemetry/exporters/ostream/common_utils.h b/ceph/src/jaegertracing/opentelemetry-cpp/exporters/ostream/include/opentelemetry/exporters/ostream/common_utils.h
new file mode 100644 (file)
index 0000000..cfebfe8
--- /dev/null
+++ b/ceph/src/jaegertracing/opentelemetry-cpp/exporters/ostream/include/opentelemetry/exporters/ostream/common_utils.h
@@ -0,0 +1,80 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+#include <sstream>
+#include <string>
+#include <vector>
+#include "opentelemetry/nostd/variant.h"
+#include "opentelemetry/sdk/common/attribute_utils.h"
+
+#pragma once
+OPENTELEMETRY_BEGIN_NAMESPACE
+namespace exporter
+{
+namespace ostream_common
+{
+/*
+  print_value is used to print out the value of an attribute within a vector.
+  These values are held in a variant which makes the process of printing them much more
+  complicated.
+*/
+
+template <typename T>
+void print_value(const T &item, std::ostream &sout)
+{
+  sout << item;
+}
+
+template <typename T>
+void print_value(const std::vector<T> &vec, std::ostream &sout)
+{
+  sout << '[';
+  size_t i  = 1;
+  size_t sz = vec.size();
+  for (auto v : vec)
+  {
+    sout << v;
+    if (i != sz)
+      sout << ',';
+    i++;
+  };
+  sout << ']';
+}
+
+// Prior to C++14, generic lambda is not available so fallback to functor.
+#if __cplusplus < 201402L
+
+class OwnedAttributeValueVisitor
+{
+public:
+  OwnedAttributeValueVisitor(std::ostream &sout) : sout_(sout) {}
+
+  template <typename T>
+  void operator()(T &&arg)
+  {
+    print_value(arg, sout_);
+  }
+
+private:
+  std::ostream &sout_;
+};
+
+#endif
+
+void print_value(const opentelemetry::sdk::common::OwnedAttributeValue &value, std::ostream &sout)
+{
+#if __cplusplus < 201402L
+  opentelemetry::nostd::visit(OwnedAttributeValueVisitor(sout), value);
+#else
+  opentelemetry::nostd::visit(
+      [&sout](auto &&arg) {
+        /* explicit this is needed by some gcc versions (observed with v5.4.0)*/
+        print_value(arg, sout);
+      },
+      value);
+#endif
+}
+
+}  // namespace ostream_common
+}  // namespace exporter
+OPENTELEMETRY_END_NAMESPACE
\ No newline at end of file