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 # Interface fortran::syscaddsideoneregionf

 Last update: 17.07.2025 

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**Definition**: `syscCouplingInterfaceF.fi` (line 66)

Provide an interface to add side one region.

## Members

- [syscaddsideoneregionf](interfacefortran_1_1syscaddsideoneregionf.md#interfacefortran_1_1syscaddsideoneregionf_1a6a2f1fe1b0c810365fec64d98be79d79)

## Public functions

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### Function syscaddsideoneregionf

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```fortran
type(syscerrorf) function syscaddsideoneregionf(interface, region)

```

Add region to side one of the couping interface.

If this region has already been added to the interface on side one, then this call will have no effect.

If a different region with the same name has already been added to the interface on side one, then a runtime error will be thrown.

If a region with the same name has already been added to the interface on side two, then a runtime error will be thrown.

If the region name contains invalid characters, a runtime error will be thrown.

**Parameters**:

- **interface**: Coupling interface to which the output variable is to be added.
- **region**: Region to be added to side one of the interface.

**Parameters**:

- interfaceinterface
- regionregion

**Return type**: type([syscerrorf](structfortran_1_1syscerrorf.md#structfortran_1_1syscerrorf)) function