Updated installer with custom action

installer/src/installer-lib/interaction.cpp

 /**
  * \file interaction.cpp Implementations of user interaction classes.
  */
 
 #include "interaction.h"
 
 /*
- * /sa MSDN "MsiProcessMessage function"
- *    http://msdn.microsoft.com/en-us/library/windows/desktop/aa370354%28v=vs.85%29.aspx
- *
- * /sa MSDN "Sending Messages to Windows Installer Using MsiProcessMessage"
- *    http://msdn.microsoft.com/en-us/library/windows/desktop/aa371614%28v=vs.85%29.aspx
- */
+ * The two constructors are identical except for the type of argument 'message'
+ * They rely on overloads of the Message constructor
+ */
+Installer_Message_Box::Installer_Message_Box( 
+  std::wstring message, 
+  box_type box,
+  buttonset_type buttonset, 
+  default_button_type default_button,
+  icon_type icon
+)
+  : Message( message, INSTALLMESSAGE( box | buttonset | default_button | icon ) )
+{}
+
+Installer_Message_Box::Installer_Message_Box( 
+  std::string message, 
+  box_type box, 
+  buttonset_type buttonset, 
+  default_button_type default_button,
+  icon_type icon
+)
+  : Message( message, INSTALLMESSAGE( box | buttonset | default_button | icon ) )
+{}