MemUsage.h

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// http://stackoverflow.com/questions/63166/how-to-determine-cpu-and-memory-consumption-from-inside-a-process
// http://stackoverflow.com/questions/669438/how-to-get-memory-usage-at-run-time-in-c

#ifndef WIRECELL_MEMUSAGE
#define WIRECELL_MEMUSAGE

#include <fstream>
#include <vector>
#include <string>


namespace WireCell {

    double memusage_resident();
    double memusage_shared();
    double memusage_size();

    
    class MemUsage {
    public:     
        typedef std::pair<double, double> memusage;
        typedef std::pair<memusage, std::string> event;
        MemUsage(const std::string& msg = "start");
        ~MemUsage();

        void push(const std::string& msg, MemUsage::memusage mu = memusage(-1,-1));

        /// Record an event.
        std::string operator()(
            std::string msg = "<tick>",
            MemUsage::memusage mu = memusage(-1,-1));
        
        /// Return summary up to now.
        std::string summary() const;

        /// Return event by index.
        event operator[](int ind) const;
        
        memusage current() const;

    private:
        /// Emit a formatted message for the given event index.
        std::string emit(int ind) const;


        std::vector< event > m_events;

    };

}


#endif