Smarter SmartText (not fully working)

include/SmartStreams.hpp

@@ -10,12 +10,12 @@
 
 namespace nb {
 
-typedef std::pair<unsigned int, std::string> SmartTextKV;
+typedef std::pair<unsigned int, std::string> SmartFormat;
 
-//template<typename T=std::string>
+template <typename T=const char*>
 struct SmartText {
-    std::string msg;
-    SmartTextKV kv = {0, ""};
+    T msg;
+    SmartFormat fmt;
 };
 
 typedef std::string (*SmartTextFormatter)(std::string, std::string);
@@ -25,7 +25,7 @@ typedef std::unordered_map<unsigned int, SmartTextFormatter> SmartFormatMap;
 template <typename ST>
 class SmartOStreamBase {
 public:
-    virtual void process(const SmartText&) = 0;
+    virtual void process(const SmartText<const char*>&) = 0;
 
     static const SmartFormatMap Formatters;
 
@@ -81,7 +81,23 @@ public:
         *_ostream << val;
     }
 
-    virtual void process(const SmartText&);
+    template <typename Msg>
+    void process(const SmartText<Msg>& msg) {
+        using D = typename std::conditional<std::is_void<Derived>::value, SmartOStream<StreamType, void>, Derived>::type;
+        try {
+            *_ostream << D::Formatters.at(msg.fmt.first)(
+                static_cast<D*>(this)->process(static_cast<Msg>(msg.msg)),
+                msg.fmt.second
+            );
+        } catch (const std::out_of_range& e) {
+            *_ostream << D::Formatters.at(0)(
+                static_cast<D*>(this)->process(static_cast<Msg>(msg.msg)),
+                msg.fmt.second
+            );
+        }
+    }
+
+    virtual void process(const SmartText<const char*>&);
 
     static const SmartFormatMap Formatters;
 
@@ -106,12 +122,13 @@ SmartOStream<ST, D>& operator<<(SmartOStream<ST, D>& stream, const U& msg) {
 }
 
 template<typename ST, typename D>
-void SmartOStream<ST, D>::process(const SmartText& msg) {
+void SmartOStream<ST, D>::process(const SmartText<const char*>& msg) {
     using Derived = typename std::conditional<std::is_void<D>::value, SmartOStream<ST, void>, D>::type;
+    std::string msg_str(msg.msg);
     try {
-        *_ostream << Derived::Formatters.at(msg.kv.first)(msg.msg, msg.kv.second);
+        *_ostream << Derived::Formatters.at(msg.fmt.first)(msg_str, msg.fmt.second);
     } catch (const std::out_of_range& e) {
-        *_ostream << Derived::Formatters.at(0)(msg.msg, msg.kv.second);
+        *_ostream << Derived::Formatters.at(0)(msg_str, msg.fmt.second);
     }
 }