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module interface_19_mod
implicit none
abstract interface
function FUNC_WITH_ARGS(x, args) result(f)
implicit none
real, intent(in) :: x
real, intent(in) :: args(:)
real :: f
end function FUNC_WITH_ARGS
end interface
contains
! an implementation of the abstract interface 'FUNC_WITH_ARGS'
function g0(x, args) result(f)
implicit none
real, intent(in) :: x
real, intent(in) :: args(:)
real :: f
f = args(1)*x**2 + args(2)*x + args(3)
end function g0
function interval_max(fun, args, grid_size) result(x)
implicit none
procedure(FUNC_WITH_ARGS) :: fun
real, intent(in) :: args(:)
integer, intent(in) :: grid_size
real :: x
real :: k
integer :: i
real :: fgrid(grid_size)
do i = 1, grid_size
k = real(i) / grid_size
!> function call with procedure variable
fgrid(i) = fun(k, args)
end do
x = maxval(fgrid)
end function interval_max
end module interface_19_mod
program interface_19
use interface_19_mod
implicit none
real :: res
real :: args_i(3) = [1.0, -2.0, 1.0]
integer, parameter :: grid_size_i = 10
res = interval_max(g0, args_i, grid_size_i)
print *, res
if (abs(res - 0.81_4) > 1.0e-13) error stop
end program
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