made interface of message and derived classes more reasonable

message.cpp

@@ -1,8 +1,20 @@
 #include "message.h"
 
+using namespace boost;
 
 
 
+void message::send(boost::asio::ip::tcp::socket& socket)
+{
+    system::error_code ec;
+
+    asio::write(socket, asio::buffer(get_message_length()), ec);
+    asio::write(socket, asio::buffer(":", sizeof(char)), ec);
+    asio::write(socket, asio::buffer(get_message()), ec);
+
+    if (ec)
+        throw std::runtime_error("Networking error: " + ec.message());
+}
 
 
 message::~message() {}

message.h

@@ -6,8 +6,13 @@
 
 class message
 {
+protected:
+    virtual std::string get_message_length() = 0;
+    virtual std::string get_message() = 0;
+
 public:
-    virtual void send(boost::asio::ip::tcp::socket&) = 0;
+
+    void send(boost::asio::ip::tcp::socket&);
     virtual void receive(boost::asio::ip::tcp::socket&) = 0;
 
     virtual ~message();

text_message.cpp

@@ -11,19 +11,15 @@ text_message::text_message(std::string text):_text(text)
 {}
 
 
-void text_message::send(boost::asio::ip::tcp::socket& socket)
+std::string text_message::get_message_length()
 {
-    boost::system::error_code ec;
+    return std::to_string(_text.size());
+}
 
 
-    asio::write(socket, asio::buffer(std::to_string(_text.size())), ec);
-
-    asio::write(socket, asio::buffer(":", sizeof(char)), ec);
-
-    asio::write(socket, asio::buffer(_text), ec);
-
-    if (ec)
-        throw std::runtime_error("Networking error: " + ec.message());
+std::string text_message::get_message()
+{
+    return _text;
 }
 
 

text_message.h

@@ -10,11 +10,14 @@ class text_message : public message
 private:
     std::string _text;
 
+protected:
+    virtual std::string get_message_length() override;
+    virtual std::string get_message() override;
+
 public:
     text_message();
     text_message(std::string);
 
-    virtual void send(boost::asio::ip::tcp::socket&) override;
     virtual void receive(boost::asio::ip::tcp::socket&) override;
 
     virtual ~text_message() override;