feat(google_benchmark): add google_benchmark example

Author: GuillaumeLagrange

examples/google_benchmark/CMakeLists.txt

@@ -0,0 +1,18 @@
+cmake_minimum_required(VERSION 3.12)
+include(FetchContent)
+
+project(codspeed_picobench_compat VERSION 0.0.0 LANGUAGES CXX)
+
+set(BENCHMARK_DOWNLOAD_DEPENDENCIES ON)
+
+FetchContent_Declare(
+    google_benchmark
+    SOURCE_DIR
+    ${CMAKE_SOURCE_DIR}/../../google_benchmark
+)
+
+FetchContent_MakeAvailable(google_benchmark)
+
+add_executable(benchmark_example main.cpp)
+
+target_link_libraries(benchmark_example benchmark::benchmark)

examples/google_benchmark/main.cpp

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+#include <benchmark/benchmark.h>
+
+// Function to benchmark
+static void BM_rand_vector(benchmark::State &state) {
+  std::vector<int> v;
+  for (auto _ : state) {
+    std::string empty_string;
+  }
+}
+// Register the function as a benchmark
+BENCHMARK(BM_rand_vector);
+
+// Function to benchmark with a parameter
+static void BM_StringCopy(benchmark::State &state) {
+  std::string x = "hello";
+  for (auto _ : state) {
+    std::string copy(x);
+  }
+}
+// Register the function as a benchmark
+BENCHMARK(BM_StringCopy);
+
+BENCHMARK_MAIN();