http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53255
Bug #: 53255
Summary: [OOP] With TYPE, wrong type-bound operator used: of
parent instead of overridden one
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: bur...@gcc.gnu.org
Reported by Reinhold Bader.
Expected: The following output:
executing base
executing override
OK
De-facto output:
executing base
executing base
FAIL
If one changes:
type(ext) :: p
to
class(ext), allocatable :: p
allocate(p)
or
class(base), allocatable :: p
allocate(ext :: p)
it works.
Thus, it seems as if only the compile-time resolution of TYPE has the problem,
while the vtable run-time version is correct.
module mod_base
implicit none
private
type, public :: base
private
real :: r(2,2) = reshape( (/ 1.0, 2.0, 3.0, 4.0 /), (/ 2, 2 /))
contains
procedure, private :: trace
generic :: operator(.tr.) => trace
end type base
contains
complex function trace(this)
class(base), intent(in) :: this
trace = this%r(1,1) + this%r(2,2)
end function trace
end module mod_base
module mod_ext
use mod_base
implicit none
private
public :: base
type, public, extends(base) :: ext
private
real :: i(2,2) = reshape( (/ 1.0, 1.0, 1.0, 1.5 /), (/ 2, 2 /))
contains
procedure, private :: trace => trace_ext
end type ext
contains
complex function trace_ext(this)
class(ext), intent(in) :: this
! the following should be executed through invoking .tr. p below
write(*,*) 'executing override'
trace_ext = .tr. this%base + (0.0, 1.0) * ( this%i(1,1) + this%i(2,2) )
end function trace_ext
end module mod_ext
program test_override
use mod_ext
implicit none
type(base) :: o
type(ext) :: p
! write(*,*) .tr. o
! write(*,*) .tr. p
if (abs(.tr. o - 5.0 ) < 1.0e-6 .and. abs( .tr. p - (5.0,2.5)) < 1.0e-6)
then
write(*,*) 'OK'
else
write(*,*) 'FAIL'
end if
end program test_override
