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// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
// SPDX-License-Identifier: BSL-1.0
// Adapted from donated nonius code.
#include <catch2/catch_test_macros.hpp>
#include <catch2/benchmark/catch_benchmark.hpp>
#include <catch2/benchmark/catch_constructor.hpp>
#include <catch2/generators/catch_generators_range.hpp>
#include <map>
namespace {
std::uint64_t Fibonacci(std::uint64_t number) {
return number < 2 ? number : Fibonacci(number - 1) + Fibonacci(number - 2);
}
}
TEST_CASE("Benchmark Fibonacci", "[!benchmark]") {
CHECK(Fibonacci(0) == 0);
// some more asserts..
CHECK(Fibonacci(5) == 5);
// some more asserts..
REQUIRE( Fibonacci( 20 ) == 6'765 );
BENCHMARK( "Fibonacci 20" ) {
return Fibonacci(20);
};
REQUIRE( Fibonacci( 25 ) == 75'025 );
BENCHMARK( "Fibonacci 25" ) {
return Fibonacci(25);
};
BENCHMARK("Fibonacci 30") {
return Fibonacci(30);
};
BENCHMARK("Fibonacci 35") {
return Fibonacci(35);
};
}
TEST_CASE("Benchmark containers", "[!benchmark]") {
static const int size = 100;
std::vector<int> v;
std::map<int, int> m;
SECTION("without generator") {
BENCHMARK("Load up a vector") {
v = std::vector<int>();
for (int i = 0; i < size; ++i)
v.push_back(i);
};
REQUIRE(v.size() == size);
// test optimizer control
BENCHMARK("Add up a vector's content") {
uint64_t add = 0;
for (int i = 0; i < size; ++i)
add += v[i];
return add;
};
BENCHMARK("Load up a map") {
m = std::map<int, int>();
for (int i = 0; i < size; ++i)
m.insert({ i, i + 1 });
};
REQUIRE(m.size() == size);
BENCHMARK("Reserved vector") {
v = std::vector<int>();
v.reserve(size);
for (int i = 0; i < size; ++i)
v.push_back(i);
};
REQUIRE(v.size() == size);
BENCHMARK("Resized vector") {
v = std::vector<int>();
v.resize(size);
for (int i = 0; i < size; ++i)
v[i] = i;
};
REQUIRE(v.size() == size);
int array[size] {};
BENCHMARK("A fixed size array that should require no allocations") {
for (int i = 0; i < size; ++i)
array[i] = i;
};
int sum = 0;
for (int val : array)
sum += val;
REQUIRE(sum > size);
SECTION("XYZ") {
BENCHMARK_ADVANCED("Load up vector with chronometer")(Catch::Benchmark::Chronometer meter) {
std::vector<int> k;
meter.measure([&](int idx) {
k = std::vector<int>();
for (int i = 0; i < size; ++i)
k.push_back(idx);
});
REQUIRE(k.size() == size);
};
int runs = 0;
BENCHMARK("Fill vector indexed", benchmarkIndex) {
v = std::vector<int>();
v.resize(size);
for (int i = 0; i < size; ++i)
v[i] = benchmarkIndex;
runs = benchmarkIndex;
};
for (int val : v) {
REQUIRE(val == runs);
}
}
}
SECTION("with generator") {
auto generated = GENERATE(range(0, 10));
BENCHMARK("Fill vector generated") {
v = std::vector<int>();
v.resize(size);
for (int i = 0; i < size; ++i)
v[i] = generated;
};
for (int val : v) {
REQUIRE(val == generated);
}
}
SECTION("construct and destroy example") {
BENCHMARK_ADVANCED("construct")(Catch::Benchmark::Chronometer meter) {
std::vector<Catch::Benchmark::storage_for<std::string>> storage(meter.runs());
meter.measure([&](int i) { storage[i].construct("thing"); });
};
BENCHMARK_ADVANCED("destroy")(Catch::Benchmark::Chronometer meter) {
std::vector<Catch::Benchmark::destructable_object<std::string>> storage(meter.runs());
for(auto&& o : storage)
o.construct("thing");
meter.measure([&](int i) { storage[i].destruct(); });
};
}
}
TEST_CASE("Skip benchmark macros", "[!benchmark]") {
std::vector<int> v;
BENCHMARK("fill vector") {
v.emplace_back(1);
v.emplace_back(2);
v.emplace_back(3);
};
REQUIRE(v.size() == 0);
std::size_t counter{0};
BENCHMARK_ADVANCED("construct vector")(Catch::Benchmark::Chronometer meter) {
std::vector<Catch::Benchmark::storage_for<std::string>> storage(meter.runs());
meter.measure([&](int i) { storage[i].construct("thing"); counter++; });
};
REQUIRE(counter == 0);
}
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