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#ifndef HISTOGRAM_H_24094D97
#define HISTOGRAM_H_24094D97
#include <map>
#include <string>
#include <random>
#include <iostream>
template <class T>
class histogram {
public:
void add(const T& inst)
{
freqtable_[inst]++;
}
void compile()
{
distribution_.clear();
int max = 0;
for (auto& it : freqtable_)
{
max += it.second;
distribution_.emplace(max, it.first);
}
freqtable_.clear();
}
const T& next(std::mt19937& rng) const
{
int max = distribution_.rbegin()->first;
std::uniform_int_distribution<int> randDist(0, max - 1);
int r = randDist(rng);
return distribution_.upper_bound(r)->second;
}
void print() const
{
for (auto& freqpair : freqtable_)
{
std::cout << freqpair.first << ": " << freqpair.second << std::endl;
}
}
private:
std::map<T, int> freqtable_;
std::map<int, T> distribution_;
};
#endif /* end of include guard: HISTOGRAM_H_24094D97 */
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