/tutorial/external/C++/example4.e

 1class EXAMPLE4
 2   --
 3   -- How to compile :
 4   --                   g++ -c Bar.cpp
 5   --                   compile -o example4 example4 Bar.o
 6   --
 7   -- As well as :
 8   --                   compile -o example4 example4 Bar.cpp
 9   --
10
11create {ANY}
12   make
13
14feature {ANY}
15   make
16      local
17         bar_pointer: POINTER; c: CHARACTER
18      do
19         bar_pointer := new_bar('x')
20         c := do_print_and_return(3)
21         io.put_character(c)
22         io.put_new_line
23         delete_bar(bar_pointer)
24      end
25
26   new_bar (c: CHARACTER): POINTER
27         -- Creation of a C++ `Bar' object. The file "Bar.h" must be
28         -- #included and the C++ creation function has one argument
29         -- (matching with `c') of type EIF_CHARACTER (matching with
30         -- CHARACTER).
31      external "[
32                 C++ [new Bar "Bar.h"] (EIF_CHARACTER)
33               ]"
34      end
35
36   do_print_and_return (i: INTEGER): CHARACTER
37         -- Calling static `Bar::do_print_and_return' passing `i' as argument.
38         -- The returned C++ type is char which is supposed to match
39         -- with CHARACTER. The file "Bar.h" must be #included (if not
40         -- yet done).
41      external "[
42                 C++ [static Bar "Bar.h" ] (EIF_INTEGER): char
43               ]"
44      end
45
46   delete_bar (bar_pointer: POINTER)
47         -- Calling C++ delete of class `Bar' on `bar_pointer'. The file
48         -- "Bar.h" must be #included (if not yet done).
49      external "[
50                 C++ [delete Bar "Bar.h"] ()
51               ]"
52      end
53
54end -- class EXAMPLE4