Make our use of fmt library work with C++20

See also fab6473

Author: joto

src/gen/gen-base.hpp

@@ -60,11 +60,11 @@ class gen_base_t
 
     std::string context();
 
-    template <typename... ARGS>
-    void log_gen(ARGS... args)
+    template <typename... TArgs>
+    void log_gen(fmt::format_string<TArgs...> format_str, TArgs &&...args)
     {
         if (m_debug) {
-            log_debug(args...);
+            log_debug(format_str, std::forward<TArgs>(args)...);
         }
     }
 

src/gen/params.cpp

@@ -118,7 +118,7 @@ void write_to_debug_log(params_t const &params, char const *message)
     if (!get_logger().debug_enabled()) {
         return;
     }
-    log_debug(message);
+    log_debug("{}", message);
     for (auto const &[key, value] : params) {
         log_debug("  {}={}", key, to_string(value));
     }

src/logging.hpp

@@ -36,9 +36,10 @@ enum class log_level
 class logger
 {
 public:
-    template <typename S, typename... TArgs>
+    template <typename... TArgs>
     void log(log_level with_level, char const *prefix,
-             fmt::text_style const &style, S const &format_str, TArgs &&...args)
+             fmt::text_style const &style,
+             fmt::format_string<TArgs...> format_str, TArgs &&...args)
     {
         if (with_level < m_current_level) {
             return;
@@ -109,37 +110,37 @@ class logger
 
 logger &get_logger() noexcept;
 
-template <typename S, typename... TArgs>
-void log_debug(S const &format_str, TArgs &&... args)
+template <typename... TArgs>
+void log_debug(fmt::format_string<TArgs...> format_str, TArgs &&...args)
 {
     get_logger().log(log_level::debug, nullptr, {}, format_str,
                      std::forward<TArgs>(args)...);
 }
 
-template <typename S, typename... TArgs>
-void log_info(S const &format_str, TArgs &&... args)
+template <typename... TArgs>
+void log_info(fmt::format_string<TArgs...> format_str, TArgs &&...args)
 {
     get_logger().log(log_level::info, nullptr, {}, format_str,
                      std::forward<TArgs>(args)...);
 }
 
-template <typename S, typename... TArgs>
-void log_warn(S const &format_str, TArgs &&... args)
+template <typename... TArgs>
+void log_warn(fmt::format_string<TArgs...> format_str, TArgs &&...args)
 {
     get_logger().log(log_level::warn, "WARNING", fg(fmt::color::red),
                      format_str, std::forward<TArgs>(args)...);
 }
 
-template <typename S, typename... TArgs>
-void log_error(S const &format_str, TArgs &&... args)
+template <typename... TArgs>
+void log_error(fmt::format_string<TArgs...> format_str, TArgs &&...args)
 {
     get_logger().log(log_level::error, "ERROR",
                      fmt::emphasis::bold | fg(fmt::color::red), format_str,
                      std::forward<TArgs>(args)...);
 }
 
-template <typename S, typename... TArgs>
-void log_sql(S const &format_str, TArgs &&... args)
+template <typename... TArgs>
+void log_sql(fmt::format_string<TArgs...> format_str, TArgs &&...args)
 {
     auto &logger = get_logger();
     if (logger.log_sql()) {
@@ -148,8 +149,8 @@ void log_sql(S const &format_str, TArgs &&... args)
     }
 }
 
-template <typename S, typename... TArgs>
-void log_sql_data(S const &format_str, TArgs &&... args)
+template <typename... TArgs>
+void log_sql_data(fmt::format_string<TArgs...> format_str, TArgs &&...args)
 {
     auto &logger = get_logger();
     if (logger.log_sql_data()) {