profiler.h

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#ifndef PROFILER_H
#define PROFILER_H
#include <vector>
#include <ctime>
#include <string>
#include <map>
 
double cpu_time_from_clocks_diff(const std::clock_t& ct_start,
                                 const std::clock_t& ct_end);
 
class Profiler
{
private:
    class Timer
    {
    private:
        size_t ncalls;
        std::clock_t clock_start;
        double wt_start;
        double cpu_time_accu;
        double wall_time_accu;
        double cpu_time_last;
        double wall_time_last;
 
        // private functions
    public:
        Timer(): ncalls(0), clock_start(0), wt_start(0), cpu_time_accu(0), wall_time_accu(0), cpu_time_last(0), wall_time_last(0) {}
        void start() noexcept;
        void stop() noexcept;
        bool is_on() const { return clock_start != 0; };
        size_t get_ncalls() const { return ncalls; };
        double get_cpu_time() const { return cpu_time_accu; };
        double get_wall_time() const { return wall_time_accu; };
        double get_cpu_time_last() const { return cpu_time_last; };
        double get_wall_time_last() const { return wall_time_last; };
    };
    static std::map<std::string, Timer> sd_map_timer;
    static std::map<std::string, int> sd_map_level;
    static std::map<std::string, std::string> sd_map_note;
    static std::vector<std::string> sd_order;
 
public:
    Profiler() = delete;
    ~Profiler() = delete;
    Profiler(const Profiler&) = delete;
    Profiler(Profiler&&) = delete;
 
    static void add(const char *tname, const char *tnote = "", int level = -1) noexcept;
    static void start(const char *tname, const char *tnote = "", int level = -1) noexcept;
    static void stop(const char *tname) noexcept;
    static double get_cpu_time_last(const char *tname) noexcept;
    static double get_wall_time_last(const char *tname) noexcept;
    static void display(int verbose = 0) noexcept;
    static int get_num_timers() noexcept { return sd_order.size(); };
};
 
#endif