Gemstone IO Library
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# FileBackedHashSet T, TElem IsProperSubsetOf Method

Determines whether the current set is a proper (strict) subset of a specified collection.

## Definition

Namespace: Gemstone.IO.Collections
Assembly: Gemstone.IO (in Gemstone.IO.dll) Version: 1.0.143 -- Release Build+37d022088aab2458baec8e7580132f50f5d9f39c
C#
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    public bool IsProperSubsetOf(
    	IEnumerable<T> other
    )

VB
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    Public Function IsProperSubsetOf (
    	other As IEnumerable(Of T)
    ) As Boolean

C++
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    public:
    virtual bool IsProperSubsetOf(
    	IEnumerable<T>^ other
    ) sealed

JavaScript
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    function IsProperSubsetOf(other);

#### Parameters

other IEnumerable T
  The collection to compare to the current set.

#### Return Value

Boolean
true if the current set is a proper subset of other; otherwise, false.

#### Implements

ISetT IsProperSubsetOf(IEnumerableT)

## Exceptions

ArgumentNullException | other is null.
NotSupportedException | The FileBackedHashSetT is read-only.

## See Also

#### Reference

FileBackedHashSetT, TElem Class
Gemstone.IO.Collections Namespace