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module template_simple_01_m
implicit none
private
public :: generic_sum
requirement operator_r(T, U, V, binary_func)
type, deferred :: T
type, deferred :: U
type, deferred :: V
pure elemental function binary_func(lhs, rhs) result(res)
type(T), intent(in) :: lhs
type(U), intent(in) :: rhs
type(V) :: res
end function
end requirement
requirement cast_r(T, cast)
type, deferred :: T
pure elemental function cast(arg) result(res)
integer, intent(in) :: arg
type(T) :: res
end function
end requirement
contains
pure elemental function cast_integer(arg) result(res)
integer, intent(in) :: arg
integer :: res
res = 0
end function
pure elemental function cast_real(arg) result(res)
integer, intent(in) :: arg
real :: res
res = 0.0
end function
pure function generic_sum {T, add, cast} (arr) result(res)
require :: operator_r(T, T, T, add), cast_r(T, cast)
type(T), intent(in) :: arr(:)
type(T) :: res
integer :: n, i
n = size(arr)
res = cast(0)
if (n > 0) then
res = arr(1)
do i=2,n
res = add(res, arr(i))
end do
end if
end function
subroutine test_template()
instantiate generic_sum(integer, operator(+), cast_integer), only: generic_sum_integer => generic_sum
instantiate generic_sum(real, operator(+), cast_real), only: generic_sum_real => generic_sum
integer :: a_i(10), i, s_i
real :: a_r(10), s_r
do i = 1, size(a_i)
a_i(i) = i
a_r(i) = i
end do
s_i = generic_sum_integer(a_i)
s_r = generic_sum_real(a_r)
print *, s_i
print *, s_r
end subroutine
end module
program template_simple_01
use template_simple_01_m
implicit none
call test_template()
end
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