attributes passed to root API

include/spdlog/details/log_attr.h

@@ -16,6 +16,13 @@ struct attr
     std::string value;
 
 public:
+    attr(std::initializer_list<std::string_view> l) {
+        if (l.size() != 2) return; // throw exception if not kv pair?
+
+        key = *l.begin();
+        value = *(l.begin()+1);
+    }
+
     attr(std::string_view k, bool v)
         : key{k}
         , value{v ? "true" : "false"}

include/spdlog/logger.h

@@ -84,6 +84,11 @@ public:
     logger &operator=(logger other) SPDLOG_NOEXCEPT;
     void swap(spdlog::logger &other) SPDLOG_NOEXCEPT;
 
+    void log(level::level_enum lvl, const T &msg, details::attr attr)
+    {
+        log(source_loc{}, lvl, msg, attr);
+    }
+
     template<typename... Args>
     void log(source_loc loc, level::level_enum lvl, format_string_t<Args...> fmt, Args &&... args)
     {
@@ -122,6 +127,19 @@ public:
         log_it_(log_msg, log_enabled, traceback_enabled);
     }
 
+    void log(source_loc loc, level::level_enum lvl, string_view_t msg, details::attr attr)
+    {
+        bool log_enabled = should_log(lvl);
+        bool traceback_enabled = tracer_.enabled();
+        if (!log_enabled && !traceback_enabled)
+        {
+            return;
+        }
+
+        details::log_msg log_msg(loc, name_, lvl, msg);
+        log_msg.attributes.push_back(std::move(attr));
+        log_it_(log_msg, log_enabled, traceback_enabled);
+    }
     void log(source_loc loc, level::level_enum lvl, string_view_t msg)
     {
         bool log_enabled = should_log(lvl);