Timer.hpp

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// -------------------------------------------------------//
//
// SHAMROCK code for hydrodynamics
// Copyright (c) 2021-2026 Timothée David--Cléris <tim.shamrock@proton.me>
// SPDX-License-Identifier: CeCILL Free Software License Agreement v2.1
// Shamrock is licensed under the CeCILL 2.1 License, see LICENSE for more information
//
// -------------------------------------------------------//
 
#pragma once

 
#include "shambase/aliases_float.hpp"
#include "shambase/string.hpp"
 
#ifndef __MACH__
    #define USE_PLF_TIMER
#endif
 
#if defined(USE_PLF_TIMER)
    #include <plf_nanotimer.h>
#else
    #include <chrono>
#endif
 
namespace shambase {
    class Timer {
        public:
#if defined(USE_PLF_TIMER)
        plf::nanotimer timer; 
#else
        std::chrono::steady_clock::time_point t_start; 
#endif
        f64 nanosec; 

        Timer() : nanosec(0.0) {}

        inline void start() {
#if defined(USE_PLF_TIMER)
            timer.start();
#else
            t_start = std::chrono::steady_clock::now();
#endif
        }

        inline void stop() {
#if defined(USE_PLF_TIMER)
            nanosec = f64(timer.get_elapsed_ns());
#else
            auto t_end = std::chrono::steady_clock::now();
            nanosec    = f64(
                std::chrono::duration_cast<std::chrono::nanoseconds>(t_end - t_start).count());
#endif
        }

        inline std::string get_time_str() const {
            auto res = sham::to_human_readable(nanosec * 1e-9);
            return sham::format("{:.2f} {}s", res.value, res.prefix);
        }

        [[nodiscard]] inline f64 elapsed_sec() const { return nanosec * 1e-9; }
    };
} // namespace shambase