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module std_prop_m
implicit none
public
requirement magma_r(T, bin)
type, deferred :: T
pure elemental function bin(x, y) result(bin)
type(T), intent(in) :: x
type(T), intent(in) :: y
type(T) :: bin
end function
end requirement
template commutative_prop(T,bin)
require :: magma_r(T,bin)
contains
pure function commutative_p(x, y) result(prop)
type(T), intent(in) :: x, y
type(logical) :: prop
prop = bin(x,y) == bin(y,x)
end function
end template
end module std_prop_m
program test_intrinsic_p
use std_prop_m
instantiate commutative_prop(integer,operator(+)), only: int_plus_comm => commutative_p
print *, "test commutative"
print *, "int_plus_comm: ", int_plus_comm(3,4)
end program
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