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module write_10_m
type :: mytype
character(len=:), allocatable :: raw
end type
interface write(unformatted)
module procedure :: my_write
end interface
interface read(unformatted)
module procedure :: my_read
end interface
contains
subroutine my_write(x, unit, iostat, iomsg)
class(mytype), intent(in) :: x
integer, intent(in) :: unit
integer, intent(out) :: iostat
character(len=*), intent(inout) :: iomsg
write(unit, iostat=iostat, iomsg=iomsg) len(x%raw)
print *, "Writing length:", len(x%raw)
if (len(x%raw) /= 5) error stop
end subroutine
subroutine my_read(x, unit, iostat, iomsg)
class(mytype), intent(inout) :: x
integer, intent(in) :: unit
integer, intent(out) :: iostat
character(len=*), intent(inout) :: iomsg
integer :: l
read(unit, iostat=iostat, iomsg=iomsg) l
allocate(character(len=l) :: x%raw)
end subroutine
end module write_10_m
program write_10
use write_10_m
implicit none
type(mytype) :: x, y
integer :: u, iostat
character(len=100) :: iomsg
x%raw = "hello"
open(newunit=u, form="unformatted", status="scratch")
write(u, iostat=iostat, iomsg=iomsg) x
print *, len(x%raw)
if (len(x%raw) /= 5) error stop
rewind(u)
read(u, iostat=iostat, iomsg=iomsg) y
print *, len(y%raw)
if (len(y%raw) /= 5) error stop
close(u)
end program write_10
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