RunTime.h

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#pragma once
 
#ifdef USE_PETSC
#include <mpi.h>
 
#include <limits>
#else
#include <chrono>
#endif
 
namespace BaseLib
{
class RunTime
{
public:
    void start()
    {
#ifdef USE_PETSC
        start_time_ = MPI_Wtime();
#else
        start_time_ = std::chrono::system_clock::now();
#endif
    }
 
    double elapsed() const
    {
#ifdef USE_PETSC
        return MPI_Wtime() - start_time_;
#else
        using namespace std::chrono;
        return duration<double>(system_clock::now() - start_time_).count();
#endif
    }
 
private:
#ifdef USE_PETSC
    double start_time_ = std::numeric_limits<double>::quiet_NaN();
#else
    std::chrono::time_point<std::chrono::system_clock> start_time_;
#endif
};
 
}  // end namespace BaseLib