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module template_array_03_math
implicit none
private
public :: add_integer, zero_integer, add_real, zero_real, mult_integer, mult_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 mult_integer(x, y) result(r)
integer, intent(in) :: x, y
integer :: r
r = x * y
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
pure function mult_real(x, y) result(r)
real, intent(in) :: x, y
real :: r
r = x * y
end function
end module
module template_array_03_m
use template_array_03_math
implicit none
private
public :: test_template
requirement operations(t, plus_t, zero_t, mult_t)
type, deferred :: t
pure function plus_t(l, r) result(result)
type(t), intent(in) :: l, r
type(t) :: result
end function
pure function zero_t(x) result(result)
type(t), intent(in) :: x
type(t) :: result
end function
pure function mult_t(l, r) result(result)
type(t), intent(in) :: l, r
type(t) :: result
end function
end requirement
!
template array_tmpl(t, plus_t, zero_t, mult_t)
require :: operations(t, plus_t, zero_t, mult_t)
private
public :: mymatmul_t
contains
subroutine mymatmul_t(i, j, k, a, b, r)
integer, parameter, intent(in) :: i, j, k
type(t), intent(in) :: a(i,j), b(j,k)
type(t) :: r(i,k)
integer :: x = 1, y = 1, z = 1
type(t) :: elem
do x = 1, i
do z = 1, k
elem = zero_t(a(1,1))
do y = 1, j
elem = plus_t(elem, mult_t(a(x,y), b(y,z)))
end do
r(x,z) = elem
end do
end do
end subroutine
end template
contains
subroutine test_template()
integer :: arr(2,2)
integer :: r(2,2)
arr(1,1) = 1
arr(1,2) = 1
arr(2,1) = 0
arr(2,2) = 1
instantiate array_tmpl(integer, add_integer, zero_integer, mult_integer), &
only: mymatmul_int => mymatmul_t
call mymatmul_int(2, 2, 2, arr, arr, r)
print *, r(1,1)
print *, r(1,2)
print *, r(2,1)
print *, r(2,2)
end subroutine
end module
program template_array_03
use template_array_03_m
implicit none
call test_template()
end
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