164 Forms of compatibility.

   165 =======================

   166 

   167 Runtime of binary compatibility mean that binary can be swaped with another

   168 version without breaking.

   169 

   170 Compile time or source compatibility mean that supplied header/interfaces allow

   171 successful compiling/linking.

   172 

   173 Example:

   174 

   175  * Change type of argument in method to more generic take source compatibility

   176    but break binary compatibility.

   177  * Adding new mothod to abstract class take binary compatibility but break

   178    compilation (unimplement method error).

   179