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// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
#include "doctest/doctest.h"
#include <fplus/fplus.hpp>
#include <fplus/stopwatch.hpp>
using namespace std::chrono_literals;
template<typename Function>
auto invoke_n_times(int n, Function f)
{
for (int i = 0; i < n; i++) {
f();
}
}
TEST_CASE("Timer, test_accuracy")
{
#ifdef NDEBUG // only on release builds
using namespace fplus;
using namespace std::chrono_literals;
auto measure_delta = []() {
fplus::stopwatch t;
std::this_thread::sleep_for(0.05s);
auto duration = t.elapsed();
auto delta = duration - 0.05;
return fabs(delta);
};
// we ask for a sleep of 0.05s, but we will have a duration that can be higher
// (up to 15 ms higher, since the cpu scheduler might switch to another process during this sleep)
// to account for the cpu/task scheduler
double max_acceptable_delta__task_scheduler = 0.02;
// One run
{
auto delta = measure_delta();
REQUIRE_LT(delta, max_acceptable_delta__task_scheduler);
}
// 10 consecutive runs (total duration = 0.5 seconds)
{
std::vector<double> deltas;
invoke_n_times(10, [&]() {
deltas.push_back(measure_delta());
});
auto mean_dev = fplus::mean_stddev<double>(deltas);
REQUIRE_LT(mean_dev.first, 0.03);
REQUIRE_LT(mean_dev.second, 0.01);
}
#endif
}
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