Fortran INTENT 属性，带有带向量下标的实参

Question

Intel's documentation about the intent attribute 说

If an actual argument is an array section with a vector subscript, it cannot be associated with a dummy array that is defined or redefined (has intent OUT or INOUT).

我应该如何理解描述？

是不是说明下面的代码是错误的？

subroutine sub(a)
    real, intent(out) :: a(:)
end subroutine sub

real :: arr(3,4)
call sub(arr(1,:))

Answer 1

很好，它是数组部分而不是向量下标。后者是您对下标使用一级整数数组表达式的地方。扩展您的示例：

subroutine sub(a)
    real, intent(out) :: a(:)
end subroutine sub

real :: arr(3,4)
call sub(arr(1,:))           ! Legal
call sub(arr(1,[ 1, 2, 4 ] ) ! Illegal

Fortran INTENT 属性，带有带向量下标的实参

Fortran INTENT attribute with an actual argument with vector subscript

fortran

intel-fortran