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### 5.21 `acc_copyout` – Copy device memory to host memory.

Description

  This function copies mapped device memory to host memory which is specified by host address a for a length len bytes in C/C++.

  In Fortran, two (2) forms are supported. In the first form, a specifies a contiguous array section. The second form a specifies a variable or array element and len specifies the length in bytes.

C/C++:

  Prototype: | `acc_copyout(h_void *a, size_t len);`

Fortran:

  Interface: | `subroutine acc_copyout(a)`
  | `type, dimension(:[,:]...) :: a`
  Interface: | `subroutine acc_copyout(a, len)`
  | `type, dimension(:[,:]...) :: a`
  | `integer len`

Reference:

  OpenACC specification v2.0, section 3.2.21.