| 1 | ! SELECT TYPE construct with TYPE IS and CLASS IS guards. |
| 2 | ! Tests: exact type matching, parent type matching via inheritance. |
| 3 | ! |
| 4 | ! CHECK: circle |
| 5 | ! CHECK: 5.0 |
| 6 | ! CHECK: is a shape |
| 7 | program test_select_type |
| 8 | implicit none |
| 9 | type :: shape |
| 10 | real :: x, y |
| 11 | end type |
| 12 | type, extends(shape) :: circle |
| 13 | real :: radius |
| 14 | end type |
| 15 | |
| 16 | type(circle) :: c |
| 17 | c%x = 1.0 |
| 18 | c%y = 2.0 |
| 19 | c%radius = 5.0 |
| 20 | |
| 21 | ! TYPE IS: exact type match. |
| 22 | select type (c) |
| 23 | type is (circle) |
| 24 | print *, 'circle' |
| 25 | print *, c%radius |
| 26 | type is (shape) |
| 27 | print *, 'shape' |
| 28 | end select |
| 29 | |
| 30 | ! CLASS IS: matches type or any extension. |
| 31 | select type (c) |
| 32 | class is (shape) |
| 33 | print *, 'is a shape' |
| 34 | class default |
| 35 | print *, 'unknown' |
| 36 | end select |
| 37 | end program |
| 38 |