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C++ Client Libraries | Google Cloud

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An idiomatic C++ client library for the Cloud Trace API, a service to send application trace data to Cloud Trace for viewing. This library is used to interact with the Trace API directly. If you are looking to instrument your application for Cloud Trace, we recommend using OpenTelemetry or a similar framework.

While this library is GA, please note Google Cloud C++ client libraries do not follow Semantic Versioning.

The following shows the code that you'll run in the google/cloud/trace/quickstart/ directory, which should give you a taste of the Cloud Trace API C++ client library API.

#include "google/cloud/trace/v2/trace_client.h"
#include "google/cloud/project.h"
#include <google/protobuf/util/time_util.h>
#include <iostream>
#include <random>
#include <thread>

std::string RandomHexDigits(std::mt19937_64& gen, int count) {
  auto const digits = std::string{"0123456789abcdef"};
  std::string sample;
  std::generate_n(std::back_inserter(sample), count, [&] {
    auto n = digits.size() - 1;
    return digits[std::uniform_int_distribution<std::size_t>(0, n)(gen)];
  });
  return sample;
}

int main(int argc, char* argv[]) try {
  if (argc != 2) {
    std::cerr << "Usage: " << argv[0] << " project-id\n";
    return 1;
  }

  namespace trace = ::google::cloud::trace_v2;
  namespace v2 = ::google::devtools::cloudtrace::v2;
  using ::google::protobuf::util::TimeUtil;

  auto client = trace::TraceServiceClient(trace::MakeTraceServiceConnection());

  // Create a span ID using some random hex digits.
  auto gen = std::mt19937_64(std::random_device{}());
  v2::Span span;
  auto span_id = RandomHexDigits(gen, 16);
  span.set_name(std::string{"projects/"} + argv[1] + "/traces/" +
                RandomHexDigits(gen, 32) + "/spans/" + span_id);
  span.set_span_id(std::move(span_id));
  *span.mutable_start_time() = (TimeUtil::GetCurrentTime)();
  // Simulate a call using a small sleep
  std::this_thread::sleep_for(std::chrono::milliseconds(2));
  *span.mutable_end_time() = (TimeUtil::GetCurrentTime)();

  auto response = client.CreateSpan(span);
  if (!response) throw std::move(response).status();
  std::cout << response->DebugString() << "\n";

  return 0;
} catch (google::cloud::Status const& status) {
  std::cerr << "google::cloud::Status thrown: " << status << "\n";
  return 1;
}

This library offers multiple *Client classes, which are listed below. Each one of these classes exposes all the RPCs for a service as member functions of the class. This library groups multiple services because they are part of the same product or are often used together. A typical example may be the administrative and data plane operations for a single product.

The library also has other classes that provide helpers, configuration parameters, and infrastructure to mock the *Client classes when testing your application.

• trace_v1::TraceServiceClient
• trace_v2::TraceServiceClient

• Error Handling - describes how the library reports errors.
• How to Override the Default Endpoint - describes how to override the default endpoint.
• How to Override the Authentication Credentials - describes how to change the authentication credentials used by the library.
• Override Retry, Backoff, and Idempotency Policies - describes how to change the default retry policies.
• Environment Variables - describes environment variables that can configure the behavior of the library.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-08-14 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This webpage provides documentation for the Cloud Trace API C++ client library, which allows interaction with the Trace API to send application trace data."],["The library offers `trace_v1::TraceServiceClient` and `trace_v2::TraceServiceClient` classes, which expose all the RPCs for their respective services."],["The most recent version is 2.37.0-rc, which is considered the latest, and there are versions going as far back as 2.11.0."],["While this library is GA, the C++ client libraries do not follow Semantic Versioning."],["The page includes a quickstart guide with example code, error handling, and information on how to override endpoints, authentication credentials, retry policies, and environment variables."]]],[]]

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