# containsExtension method

bool containsExtension(

1. FieldExtensionType extensionType

)

Returns a value indicating whether the field (or one of its child fields) contains an extension of the specified type.

param extensionType The field extension type. return A value indicating whether the field (or one of its child fields) contains the specified extension. throws BiosealException An error has occurred during Bioseal Library execution.

## Implementation

    bool containsExtension(FieldExtensionType extensionType) {
      Pointer<Bool> pResult = calloc();
      try {
        var err = biosealSDK.id3BiosealField_ContainsExtension(_pHandle.value, extensionType.value, pResult);
        if (err != BiosealError.success.value) {
          throw BiosealException(err);
        }
        final vResult = pResult.value;
        return vResult;
      } finally {
        calloc.free(pResult);
      }
    }