runtime_metric.h

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#pragma once
#include <string>
#include <unordered_map>
 
namespace hgps {
 
class RuntimeMetric {
  public:
    using IteratorType = std::unordered_map<std::string, double>::iterator;
 
    using ConstIteratorType = std::unordered_map<std::string, double>::const_iterator;
 
    std::size_t size() const noexcept;
 
    double &operator[](const std::string &metric_key);
 
    double &at(const std::string &metric_key);
 
    double at(const std::string &metric_key) const;
 
    bool contains(const std::string &metric_key) const noexcept;
 
    bool emplace(const std::string &metric_key, double value);
 
    bool erase(const std::string &metric_key);
 
    void clear() noexcept;
 
    void reset() noexcept;
 
    bool empty() const noexcept;
 
    IteratorType begin() noexcept { return metrics_.begin(); }
 
    IteratorType end() noexcept { return metrics_.end(); }
 
    ConstIteratorType begin() const noexcept { return metrics_.cbegin(); }
 
    ConstIteratorType end() const noexcept { return metrics_.cend(); }
 
    ConstIteratorType cbegin() const noexcept { return metrics_.cbegin(); }
 
    ConstIteratorType cend() const noexcept { return metrics_.cend(); }
 
  private:
    std::unordered_map<std::string, double> metrics_;
};
} // namespace hgps