src/utils/elapsed_logger.h


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#pragma once

#include <chrono>
#include <iomanip>
#include <iostream>
#include <string>

/*!
 * \brief The elapsed_logger class - print `message: <own life time>` on destruction
 */
template<typename T = std::chrono::microseconds, int W = 8>
class elapsed_logger
{
    using clk = std::chrono::high_resolution_clock;

public:
    explicit elapsed_logger(const std::string &&message)
        : m_start{clk::now()}
        , m_message{std::move(message)}
    {}

    ~elapsed_logger()
    {
        using namespace std::chrono;
        const auto duration = duration_cast<T>(clk::now() - m_start);
        std::cout << m_message << ": " << std::setw(W) << duration << std::endl;
    }

private:
    const std::chrono::time_point<clk> m_start;
    const std::string m_message;
};