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#ifndef LOGGER_HH
#define LOGGER_HH
#include <filesystem>
#include <memory>
#include <string>
class Logger {
public:
virtual ~Logger() = default;
static std::unique_ptr<Logger> create_stdio();
// Can return nullptr, will write reason to fallback.
static std::unique_ptr<Logger> create_file(std::filesystem::path const& path,
Logger* fallback);
static std::unique_ptr<Logger> create_syslog(std::string const& prgname);
static std::unique_ptr<Logger> create_null();
virtual void err(char const* format, ...)
#if HAVE_ATTRIBUTE_FORMAT
__attribute__((format(printf, 2, 3))) // this takes up 1
#endif // HAVE_ATTRIBUTE_FORMAT
= 0;
virtual void warn(char const* format, ...)
#if HAVE_ATTRIBUTE_FORMAT
__attribute__((format(printf, 2, 3)))
#endif // HAVE_ATTRIBUTE_FORMAT
= 0;
virtual void info(char const* format, ...)
#if HAVE_ATTRIBUTE_FORMAT
__attribute__((format(printf, 2, 3)))
#endif // HAVE_ATTRIBUTE_FORMAT
= 0;
#ifdef NDEBUG
void dbg(char const*, ...)
#if HAVE_ATTRIBUTE_FORMAT
__attribute__((format(printf, 2, 3)))
#endif // HAVE_ATTRIBUTE_FORMAT
{}
#else
virtual void dbg(char const* format, ...)
#if HAVE_ATTRIBUTE_FORMAT
__attribute__((format(printf, 2, 3)))
#endif // HAVE_ATTRIBUTE_FORMAT
= 0;
#endif
protected:
Logger() = default;
Logger(Logger const&) = delete;
Logger& operator=(Logger const&) = delete;
};
#endif // LOGGER_HH
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