Antonio Cossari
62 lines
2.9 KiB
C++
62 lines
2.9 KiB
C++
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* Log.hpp :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: acossari <acossari@student.codam.nl> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2026/08/19 20:30:58 by acossari #+# #+# */
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/* Updated: 2026/08/20 22:18:40 by acossari ### ########.fr */
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/* */
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/* ************************************************************************** */
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#pragma once
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#include <format>
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#include <string_view>
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// Free functions in a namespace, not a class: the whole process shares one
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// verbosity level and one destination, so a second instance would have nothing
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// of its own to hold.
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namespace webserv::log {
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// The "class" keyword here is overloaded: not a class but a scoped enum.
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// Names must be written Level::Info, plus no implicit conversion to int.
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enum class Level { Debug, Info, Warn, Error };
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// Thin Template Idiom: vlog keeps one ordinary body instead of repeating it
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// for every argument type combination. The small wrappers retain compile time
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// checks, erase those types and converge here at the shared sink. Its v follows
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// the C variadic convention. The sink filters by level before formatting.
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void vlog(Level messageLevel, std::string_view formatString,
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std::format_args args);
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// format_string uses Args to check at compile time that every placeholder
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// receives a value of the expected type. Args&& is a "forwarding reference",
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// so the same wrapper accepts lvalues and rvalues, as in info("{}", value)
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// and info("{}", 42), without copying them.
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template <typename... Args>
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void debug(std::format_string<Args...> formatString, Args&&... args) {
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// make_format_args packs the arguments together with their type information.
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// vlog then sees only std::format_args and does not need a separate template
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// version for every combination of argument types.
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vlog(Level::Debug, formatString.get(), std::make_format_args(args...));
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}
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template <typename... Args>
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void info(std::format_string<Args...> formatString, Args&&... args) {
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vlog(Level::Info, formatString.get(), std::make_format_args(args...));
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}
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template <typename... Args>
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void warn(std::format_string<Args...> formatString, Args&&... args) {
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vlog(Level::Warn, formatString.get(), std::make_format_args(args...));
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}
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template <typename... Args>
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void error(std::format_string<Args...> formatString, Args&&... args) {
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vlog(Level::Error, formatString.get(), std::make_format_args(args...));
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}
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} // namespace webserv::log
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