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module template_array_05_m
implicit none
private
public :: vector_t, matrix_t
requirement op(t, plus_t)
type, deferred :: t
pure elemental function plus_t(l, r) result(rs)
type(t), intent(in) :: l, r
type(t) :: rs
end function
end requirement
template vector_t(t, plus_t, n)
require :: op(t, plus_t)
integer :: n
private
public :: add_array
type :: vector
type(t) :: elements(n)
end type
contains
pure function add_vector(a, b) result(r)
type(vector), intent(in) :: a, b
type(vector) :: r
r%elements = plus_t(a%elements, b%elements)
end function
end template
template matrix_t(t, plus_t, n)
require :: op(t, plus_t)
integer :: n
private
public :: add_matrix
type :: matrix
type(t) :: elements(n, n)
end type
contains
pure function add_matrix(a, b) result(r)
type(matrix), intent(in) :: a, b
type(matrix) :: r
r%elements = plus_t(a%elements, b%elements)
end function
end template
end module
program template_array_05
use template_array_05_m
integer, parameter :: n = 10
instantiate vector_t(integer, operator(+), n), &
only: int_vector => vector, &
int_add_vector => add_vector
type(int_vector) :: a, b, c
integer :: i, j
do i = 1, n
a%elements(i) = i
b%elements(i) = i
end do
c = int_add_vector(a, b)
print *, c%elements
instantiate matrix_t(integer, operator(+), n), &
only: int_matrix => matrix, &
int_add_matrix => add_matrix
type(int_matrix) :: am, bm, cm
do i = 1, n
do j = 1, n
am%elements(i,j) = i + j
bm%elements(i,j) = i + j
end do
end do
cm = int_add_matrix(am, bm)
print *, cm%elements
end
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