View source for Documentation:OCLOperators value

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Returns the non-null value of a simple nullable type.
{| class="wikitable"
!Expression
!Result
|-
|int? with the value null
|0
|}
{{Edited|July|12|2025}}The value of the current nullable object is returned if it has been assigned a valid underlying value - otherwise, 0 is returned.

Some expressions may require  a non-null value and yet your attribute is a nullable type. A scenario like this is catered for in the MDriven OCL expressions.
 '''.Value''' is available for all number types including Integer, Decimal, Double, and Int64.
For example:

[[File:getting-value-for-nullable-type.png|alt=getting value for nullable type|frameless|202x202px]]

To calculate the Total Price of all products use:
 Product.allinstances.Price->sum.Value
or:
 Product.allinstances->collect(i|i.Price.Value)->sum
This will ensure a value is always returned by the expression, either when there are no product instances or the product price is not set for all instances.


'''<big>Summary table:</big>'''
{| class="wikitable"
|+
!Nullable Value
!Result of <code>.Value</code>
|-
|null
|0
|-
|5
|5
|-
|12.5
|12.5
|}
It helps prevent errors in OCL when using nullable numbers.
[[Category:Intermediate-Friendly]]
[[Category:OCL (Object Constraint Language)]]
[[Category:OCL Operators: Numeric & Arithmetic]]
[[Category:Priority 70]]