[A] Added more c++ funcions

include/fort.h

@@ -107,6 +107,17 @@ SOFTWARE.
 #endif
 
 
+/*****************************************************************************
+ *               RETURN CODES
+ * ***************************************************************************/
+typedef int fort_status_t;
+#define FT_SUCCESS        0
+#define FT_MEMORY_ERROR   -1
+#define FT_ERROR          -2
+#define FT_EINVAL         -3
+#define IS_SUCCESS(arg) ((arg) >= 0)
+#define IS_ERROR(arg) ((arg) < 0)
+
 
 /*
  *  Wchar support

include/fort.hpp

@@ -54,9 +54,11 @@ public:
     template <typename T>
     FTable &operator<<(const T &arg)
     {
-        std::stringstream stream;
         stream << arg;
-        ft_nwrite(table, 1, stream.str().c_str());
+        if (stream.tellp()) {
+            ft_nwrite(table, 1, stream.str().c_str());
+            stream = std::stringstream{};
+        }
         return *this;
     }
 
@@ -71,10 +73,44 @@ public:
         return *this;
     }
 
+    bool write(const char *str)
+    {
+        return IS_SUCCESS(ft_write(table, str));
+    }
+
+    bool write_ln(const char *str)
+    {
+        return IS_SUCCESS(ft_write_ln(table, str));
+    }
+
+    bool write(const std::string &str)
+    {
+        return write(str.c_str());
+    }
+
+    bool write_ln(const std::string &str)
+    {
+        return write_ln(str.c_str());
+    }
+
+    template <typename T, typename ...Ts>
+    bool write(const T &arg, const Ts &...args)
+    {
+        return write(arg) && write(args...);
+    }
+
+    template <typename T, typename ...Ts>
+    bool write_ln(const T &arg, const Ts &...args)
+    {
+        if (sizeof...(args) == 0)
+            return write_ln(arg);
+        return write(arg) && write_ln(args...);
+    }
 
 
 private:
     FTABLE *table;
+    std::stringstream stream;
 };
 
 }