logger.hpp

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#ifndef PLSSVM_DETAIL_LOGGER_HPP_
#define PLSSVM_DETAIL_LOGGER_HPP_
#pragma once
 
#include "plssvm/detail/performance_tracker.hpp"  // plssvm::detail::is_tracking_entry_v, PLSSVM_DETAIL_PERFORMANCE_TRACKER_ADD_TRACKING_ENTRY
 
#include "fmt/chrono.h"                           // format std::chrono types
#include "fmt/format.h"                           // fmt::format
#include "fmt/ostream.h"                          // format types with an operator<< overload
 
#include <iosfwd>                                 // std::istream, std::ostream
#include <iostream>                               // std::cout
#include <string_view>                            // std::string_view
#include <utility>                                // std::forward
 
namespace plssvm {
 
enum class verbosity_level {
    quiet = 0b000,
    libsvm = 0b001,
    timing = 0b010,
    full = 0b100
};
 
extern verbosity_level verbosity;
 
std::ostream &operator<<(std::ostream &out, verbosity_level verb);
 
std::istream &operator>>(std::istream &in, verbosity_level &verb);
 
[[nodiscard]] verbosity_level operator|(verbosity_level lhs, verbosity_level rhs);
verbosity_level operator|=(verbosity_level &lhs, verbosity_level rhs);
 
[[nodiscard]] verbosity_level operator&(verbosity_level lhs, verbosity_level rhs);
verbosity_level operator&=(verbosity_level &lhs, verbosity_level rhs);
 
namespace detail {
 
template <typename... Args>
void log(const verbosity_level verb, const std::string_view msg, Args &&...args) {
    // if the verbosity level is quiet, nothing is logged
    // otherwise verb must contain the bit-flag set by plssvm::verbosity
    if (verbosity != verbosity_level::quiet && (verb & verbosity) != verbosity_level::quiet) {
        std::cout << fmt::format(msg, args...);
    }
 
    // if performance tracking has been enabled, add tracking entries
    ([](auto &&arg) {
        if constexpr (detail::is_tracking_entry_v<decltype(arg)>) {
            PLSSVM_DETAIL_PERFORMANCE_TRACKER_ADD_TRACKING_ENTRY(std::forward<decltype(arg)>(arg));
        }
    }(std::forward<Args>(args)),
     ...);
}
 
}  // namespace detail
 
}  // namespace plssvm
 
#endif  // PLSSVM_DETAIL_LOGGER_HPP_