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Clarify the difference between BENCHMARK_TEMPLATE_F and BENCHMARK_TEMPLATE_DEFINE_F + BENCHMARK_REGISTER_F #1815

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merged 3 commits into from
Jul 16, 2024
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Clarify the difference between BENCHMARK_TEMPLATE_F and BENCHMARK_TEMPLATE_DEFINE_F + BENCHMARK_REGISTER_F #1815

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7c704ed
Clarify BENCHMARK_REGISTER_F
jiawen Jul 15, 2024
7b336df
More informative comments.
jiawen Jul 15, 2024
6b86620
Update user_guide.md
jiawen Jul 15, 2024
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15 changes: 10 additions & 5 deletions docs/user_guide.md
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Original file line number Diff line number Diff line change
Expand Up @@ -624,20 +624,22 @@ public:
}
};

// Defines and registers `FooTest` using the class `MyFixture`.
BENCHMARK_F(MyFixture, FooTest)(benchmark::State& st) {
for (auto _ : st) {
...
}
}

// Only defines `BarTest` using the class `MyFixture`.
BENCHMARK_DEFINE_F(MyFixture, BarTest)(benchmark::State& st) {
for (auto _ : st) {
...
}
}
/* BarTest is NOT registered */
// `BarTest` is NOT registered.
BENCHMARK_REGISTER_F(MyFixture, BarTest)->Threads(2);
/* BarTest is now registered */
// `BarTest` is now registered.
```

### Templated Fixtures
Expand All @@ -653,19 +655,22 @@ For example:
template<typename T>
class MyFixture : public benchmark::Fixture {};

// Defines and registers `IntTest` using the class template `MyFixture<int>`.
BENCHMARK_TEMPLATE_F(MyFixture, IntTest, int)(benchmark::State& st) {
for (auto _ : st) {
...
}
}

// Only defines `DoubleTest` using the class template `MyFixture<double>`.
BENCHMARK_TEMPLATE_DEFINE_F(MyFixture, DoubleTest, double)(benchmark::State& st) {
for (auto _ : st) {
...
}
}

// `DoubleTest` is NOT registered.
BENCHMARK_REGISTER_F(MyFixture, DoubleTest)->Threads(2);
// `DoubleTest` is now registered.
```

<a name="custom-counters" />
Expand Down Expand Up @@ -1012,11 +1017,11 @@ in any way. `<expr>` may even be removed entirely when the result is already
known. For example:

```c++
/* Example 1: `<expr>` is removed entirely. */
// Example 1: `<expr>` is removed entirely.
int foo(int x) { return x + 42; }
while (...) DoNotOptimize(foo(0)); // Optimized to DoNotOptimize(42);

/* Example 2: Result of '<expr>' is only reused */
// Example 2: Result of '<expr>' is only reused.
int bar(int) __attribute__((const));
while (...) DoNotOptimize(bar(0)); // Optimized to:
// int __result__ = bar(0);
Expand Down
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