Pass const state to Fixture::SetUp. Add map_test.

include/benchmark/benchmark_api.h

@@ -486,12 +486,12 @@ public:
     Fixture() : internal::Benchmark("") {}
 
     virtual void Run(State& st) {
-      this->SetUp();
+      this->SetUp(st);
       this->BenchmarkCase(st);
       this->TearDown();
     }
 
-    virtual void SetUp() {}
+    virtual void SetUp(const State&) {}
     virtual void TearDown() {}
 
 protected:

test/CMakeLists.txt

@@ -39,6 +39,9 @@ add_test(basic_benchmark basic_test --benchmark_min_time=0.01)
 compile_benchmark_test(fixture_test)
 add_test(fixture_test fixture_test --benchmark_min_time=0.01)
 
+compile_benchmark_test(map_test)
+add_test(map_test map_test --benchmark_min_time=0.01)
+
 compile_benchmark_test(cxx03_test)
 set_target_properties(cxx03_test
     PROPERTIES COMPILE_FLAGS "${CXX03_FLAGS}")

test/fixture_test.cc

@@ -2,33 +2,33 @@
 #include "benchmark/benchmark.h"
 
 #include <cassert>
+#include <memory>
 
-class MyFixture : public ::benchmark::Fixture
-{
-public:
-    void SetUp() {
-        data = new int(42);
-    }
+class MyFixture : public ::benchmark::Fixture {
+ public:
+  void SetUp(const ::benchmark::State&) {
+    assert(data.get() == nullptr);
+    data.reset(new int(42));
+  }
 
-    void TearDown() {
-        assert(data != nullptr);
-        delete data;
-        data = nullptr;
-    }
+  void TearDown() {
+    assert(data.get() != nullptr);
+    data.release();
+  }
 
-    ~MyFixture() {
-      assert(data == nullptr);
-    }
+  ~MyFixture() {
+    assert(data == nullptr);
+  }
 
-    int* data;
+  std::unique_ptr<int> data;
 };
 
 
 BENCHMARK_F(MyFixture, Foo)(benchmark::State& st) {
-    assert(data != nullptr);
-    assert(*data == 42);
-    while (st.KeepRunning()) {
-    }
+  assert(data.get() != nullptr);
+  assert(*data == 42);
+  while (st.KeepRunning()) {
+  }
 }
 
 BENCHMARK_DEFINE_F(MyFixture, Bar)(benchmark::State& st) {
@@ -38,5 +38,4 @@ BENCHMARK_DEFINE_F(MyFixture, Bar)(benchmark::State& st) {
 }
 BENCHMARK_REGISTER_F(MyFixture, Bar)->Arg(42);
 
-
 BENCHMARK_MAIN()

test/map_test.cc

+#include "benchmark/benchmark.h"
+
+#include <map>
+
+namespace {
+
+std::map<int, int> ConstructRandomMap(int size) {
+  std::map<int, int> m;
+  for (int i = 0; i < size; ++i) {
+    m.insert(std::make_pair(rand() % size, rand() % size));
+  }
+  return m;
+}
+
+}  // namespace
+
+// Basic version.
+static void BM_MapLookup(benchmark::State& state) {
+  const int size = state.range_x();
+  while (state.KeepRunning()) {
+    state.PauseTiming();
+    std::map<int, int> m = ConstructRandomMap(size);
+    state.ResumeTiming();
+    for (int i = 0; i < size; ++i) {
+      benchmark::DoNotOptimize(m.find(rand() % size));
+    }
+  }
+  state.SetItemsProcessed(state.iterations() * size);
+}
+BENCHMARK(BM_MapLookup)->Range(1 << 3, 1 << 12);
+
+// Using fixtures.
+class MapFixture : public ::benchmark::Fixture {
+ public:
+  void SetUp(const ::benchmark::State& st) {
+    m = ConstructRandomMap(st.range_x());
+  }
+
+  void TearDown() {
+    m.clear();
+  }
+
+  std::map<int, int> m;
+};
+
+BENCHMARK_DEFINE_F(MapFixture, Lookup)(benchmark::State& state) {
+  const int size = state.range_x();
+  while (state.KeepRunning()) {
+    for (int i = 0; i < size; ++i) {
+      benchmark::DoNotOptimize(m.find(rand() % size));
+    }
+  }
+  state.SetItemsProcessed(state.iterations() * size);
+}
+BENCHMARK_REGISTER_F(MapFixture, Lookup)->Range(1<<3, 1<<12);
+
+BENCHMARK_MAIN()