.. currentmodule:: TatInternalObject

Variants
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.. pas:function:: VarIsNull(Variant: Variant): Boolean

  Функция проверяет равно ли значение параметра **Null**

  :param Variant Variant:
    Проверяемый параметр

  :rtype: Boolean

.. pas:class:: TVarType

  Перечисление

  .. pas:attribute:: varEmpty

  .. pas:attribute:: varNull

  .. pas:attribute:: varSmallint

  .. pas:attribute:: varInteger

  .. pas:attribute:: varSingle

  .. pas:attribute:: varDouble

  .. pas:attribute:: varCurrency

  .. pas:attribute:: varDate

  .. pas:attribute:: varOleStr

  .. pas:attribute:: varDispatch

  .. pas:attribute:: varError

  .. pas:attribute:: varBoolean

  .. pas:attribute:: varVariant

  .. pas:attribute:: varUnknown

  .. pas:attribute:: varShortInt

  .. pas:attribute:: varByte

  .. pas:attribute:: varWord

  .. pas:attribute:: varLongWord

  .. pas:attribute:: varInt64

  .. pas:attribute:: varStrArg

  .. pas:attribute:: varString

  .. pas:attribute:: varAny

  .. pas:attribute:: varTypeMask

  .. pas:attribute:: varArray

  .. pas:attribute:: varByRef