GNU libgomp: acc_get_num_devices

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### 5.1 `acc_get_num_devices` – Get number of devices for given device type

Description

  This function returns a value indicating the number of devices available for the device type specified in devicetype.

C/C++:

  Prototype: | `int acc_get_num_devices(acc_device_t devicetype);`

Fortran:

  Interface: | `integer function acc_get_num_devices(devicetype)`
  | `integer(kind=acc_device_kind) devicetype`

Reference:

  OpenACC specification v2.0, section 3.2.1.