// -*- mode: c++ -*-

#pragma once

namespace atlas::time {
template <typename Duration>
class Timer {
public:
    using duration_type = Duration;

    virtual ~Timer() = default;
    virtual auto start() -> void = 0;
    virtual auto elapsed() const -> duration_type;

    template <typename T>
    struct TimerResult {
        T value;
        duration_type duration;
    };

    template <typename F>
    [[nodiscard]] auto measure(F&& f) -> TimerResult<decltype(f())>
    {
        start();
        auto v = f();
        return { v, elapsed() };
    }
};
}