in_place_span.hpp

Go to the documentation of this file.

#pragma once
 
/// @file userver/tracing/in_place_span.hpp
/// @brief @copybrief tracing::InPlaceSpan
 
#include <string>
 
#include <userver/tracing/span.hpp>
#include <userver/utils/fast_pimpl.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace tracing {
 
/// @brief Avoids an extra allocation by storing tracing::Span data in-place
/// @warning Never put InPlaceSpan on the stack! It has a large size and can
/// cause stack overflow.
class InPlaceSpan final {
 public:
  explicit InPlaceSpan(std::string&& name,
                       utils::impl::SourceLocation source_location =
                           utils::impl::SourceLocation::Current());
 
  explicit InPlaceSpan(std::string&& name, std::string&& trace_id,
                       std::string&& parent_span_id,
                       utils::impl::SourceLocation source_location =
                           utils::impl::SourceLocation::Current());
 
  InPlaceSpan(InPlaceSpan&&) = delete;
  InPlaceSpan& operator=(InPlaceSpan&&) = delete;
  ~InPlaceSpan();
 
  tracing::Span& Get() noexcept;
 
 private:
  struct Impl;
  utils::FastPimpl<Impl, 4224, 8> impl_;
};
 
}  // namespace tracing
 
USERVER_NAMESPACE_END