Method unregisterHistogram

flow/Histogram.cpp:54–61

}

void HistogramRegistry::unregisterHistogram(Histogram* h) {
	std::string name = h->name();
	if (histograms.find(name) == histograms.end()) {
		TraceEvent(SevError, "HistogramNotRegistered").detail("group", h->group).detail("op", h->op);
	}
	int count = histograms.erase(name);
	ASSERT(count == 1);
}

Histogram* HistogramRegistry::lookupHistogram(std::string const& name) {
	auto h = histograms.find(name);