Removed distinction between c string type and refined string type

Author: romainbrenguier

src/util/refined_string_type.cpp

@@ -29,22 +29,23 @@ refined_string_typet::refined_string_typet(
   array_typet char_array(char_type, infinite_index);
   components().emplace_back("length", index_type);
   components().emplace_back("content", char_array);
+  set_tag(CPROVER_PREFIX"refined_string_type");
 }
 
 /*******************************************************************\
 
-Function: refined_string_typet::is_c_string_type
+Function: refined_string_typet::is_refined_string_type
 
   Inputs: a type
 
- Outputs: Boolean telling whether the type is that of C strings
+ Outputs: Boolean telling whether the input is a refined string type
 
 \*******************************************************************/
 
-bool refined_string_typet::is_c_string_type(const typet &type)
+bool refined_string_typet::is_refined_string_type(const typet &type)
 {
   return
     type.id()==ID_struct &&
-    to_struct_type(type).get_tag()==CPROVER_PREFIX"string";
+    to_struct_type(type).get_tag()==CPROVER_PREFIX"refined_string_type";
 }
 

src/util/refined_string_type.h

@@ -42,10 +42,6 @@ class refined_string_typet: public struct_typet
     return components()[0].type();
   }
 
-  // For C the unrefined string type is __CPROVER_string
-
-  static bool is_c_string_type(const typet &type);
-
   static bool is_refined_string_type(const typet &type);
 
   constant_exprt index_of_int(int i) const