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perf_stats: Mark GetMeanFrametime() as const

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The general pattern is to mark mutexes as mutable when it comes to
matters of constness, given the mutex acts as a transient member of a
data structure.
This commit is contained in:
Lioncash 2020-08-03 08:12:03 -04:00
parent 05781ce8c4
commit d767be65be
2 changed files with 9 additions and 9 deletions
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7
src/core/perf_stats.cpp
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@ -74,15 +74,16 @@ void PerfStats::EndGameFrame() {
game_frames += 1;
}
double PerfStats::GetMeanFrametime() {
double PerfStats::GetMeanFrametime() const {
std::lock_guard lock{object_mutex};
if (current_index <= IgnoreFrames) {
return 0;
}
const double sum = std::accumulate(perf_history.begin() + IgnoreFrames,
perf_history.begin() + current_index, 0.0);
return sum / (current_index - IgnoreFrames);
return sum / static_cast<double>(current_index - IgnoreFrames);
}
PerfStatsResults PerfStats::GetAndResetStats(microseconds current_system_time_us) {
@ -111,7 +112,7 @@ PerfStatsResults PerfStats::GetAndResetStats(microseconds current_system_time_us
return results;
}
double PerfStats::GetLastFrameTimeScale() {
double PerfStats::GetLastFrameTimeScale() const {
std::lock_guard lock{object_mutex};
constexpr double FRAME_LENGTH = 1.0 / 60;