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module template_array_02_math
implicit none
private
public :: add_integer, zero_integer, add_real, zero_real
contains
pure function add_integer(x, y) result(r)
integer, intent(in) :: x, y
integer :: r
r = x + y
end function
pure function zero_integer(x) result(r)
integer, intent(in) :: x
integer :: r
r = 0
end function
pure function add_real(x, y) result(r)
real, intent(in) :: x, y
real :: r
r = x + y
end function
pure function zero_real(x) result(r)
real, intent(in) :: x
real :: r
r = 0
end function
end module
module template_array_02_m
use template_array_02_math
implicit none
private
public :: test_template
requirement operations(t, plus_t, zero_t)
type, deferred :: t
pure function plus_t(l, r) result(rs)
type(t), intent(in) :: l, r
type(t) :: rs
end function
pure function zero_t(l) result(rs)
type(t), intent(in) :: l
type(t) :: rs
end function
end requirement
template array_tmpl(t, plus_t, zero_t)
require :: operations(t, plus_t, zero_t)
private
public :: mysum_t
contains
function mysum_t(a) result(r)
type(t), intent(in) :: a(:)
type(t) :: r
integer :: i
r = zero_t(a(1))
do i = 1, size(a)
r = plus_t(r, a(i))
end do
end function
function mysum_t_n(n, a) result(r)
integer, intent(in) :: n
type(t), intent(in) :: a(n)
type(t) :: r
integer :: i
r = zero_t(a(1))
do i = 1, size(a)
r = plus_t(r, a(i))
end do
end function
end template
contains
subroutine test_template()
instantiate array_tmpl(integer, add_integer, zero_integer), only: &
mysum_integer => mysum_t, mysum_integer_n => mysum_t_n
integer :: a(10), b(10), i, sa, sb
do i = 1, size(a)
a(i) = i
b(i) = i
end do
sa = mysum_integer(a)
sb = mysum_integer_n(size(b), b)
print *, sa
print *, sb
end subroutine
end module
program template_array_02
use template_array_02_math
use template_array_02_m
implicit none
call test_template()
end
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