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Unary adding operator 4.4,
...4.5,
...C;
...4.5.4
See Also:
* arithmetic operator
* overloading of an operator
* predefined operator
as an operation of a discrete type 3.5.5
in a simple expression 4.4
overloaded 6.7

Unary operator 4.5;
...3.5.5,
...3.5.8,
...3.5.10,
...3.6.2,
...4.5.4,
...4.5.6,
...C
See Also:
* highest precedence operator
* unary adding operator
as an operation of a fixed point type 3.5.1

UNCHECKED_CONVERSION (predefined generic library function) 13.10.2;
...C,
...13.10

UNCHECKED_DEALLOCATION (predefined generic library procedure) 13.10.1;
...4.8,
...C,
...13.1 4

Unconditional termination of a task
See:
* abnormal task
* abort statement

Unconstrained array definition 3.6
Unconstrained array type 3.6
as an actual to a formal private type 12.3.2
formal parameter 6.2
subject to a length clause 13.2

Unconstrained subtype 3.3,
...3.3.2
See Also:
* constrained subtype
* constraint
* subtype
* type
indication in a generic unit 12.3.2

Unconstrained type 3.3;
...3.2.1,
...3.6,
...3.6.1,
...3.7,
...3.7.2
formal parameter 6.2
with discriminants 6.4.1,
...12.3.2

Unconstrained variable 3.3,
...3.6,
...3.7;
...12.3.1
as a subcomponent
[see: subcomponent]

Undefined value
of a scalar parameter 6.2
of a scalar variable 3.2.1

Underline character 2.1
in a based literal 2.4.2
in a decimal literal 2.4.1
in an identifier 2.3

Unhandled exception 11.4.1
Unit
See:
* compilation unit
* generic unit
* library unit
* program unit
* storage unit
* task unit

Universal expression 4.10
assigned 5.2
in an attribute designator 4.1.4
of a real type implicitly converted 4.5.7
that is static 4.10

Universal type 4.10
See Also:
* conversion
* implicit conversion
expression
[see: expression, numeric literal]
of a named number 3.2.2;
...3.2
result of an attribute
[see: attribute]

UNIVERSAL_FIXED (predefined type) 3.5.9
result of fixed point multiplying operators 4.5.5

UNIVERSAL_INTEGER (predefined type) 3.5.4,
...4.10;
...C
See Also:
* integer literal
argument to a conversion 3.3.3,
...4.6
attribute 3.5.5,
...13.7.1,
...13.7.2,
...13.7.3;
...9.9
bounds of a discrete range 3.6.1
bounds of a loop parameter 5.5
codes representing enumeration type values 13.3
converted to an integer type 3.5.5
of integer literals 2.4,
...4.2
result of an operation 4.10;
...4.5

UNIVERSAL_REAL (predefined type) 3.5.6,
...4.10
See Also:
* real literal
argument to a conversion 3.3.3,
...4.6
attribute 13.7.1
converted to a fixed point type 3.5.10
converted to a floating point type 3.5.8
of real literals 2.4,
...4.2
result of an operation 4.10;
...4.5

Updating the value of an object 6.2
Upper bound
See:
* bound
* last attribute

Upper case letter 2.1
See Also:
* basic graphic character
A to F in a based literal 2.4.2
E in a decimal literal 2.4.1
in an identifier 2.3

Urgency of a task
See:
* task priority

Use clause (to achieve direct visibility) 8.4;
...8.3,
...D
See Also:
* context clause
as a basic declarative item 3.9
as a later declarative item 3.9
in a code procedure body 13.8
in a context clause of a compilation unit 10.1.1
in a context clause of a subunit 10.2
inserted by the environment 10.4

USE_ERROR (input-output exception) 14.4;
...14.2.1,
...14.2.3,
...14.2.5,
...14.3.3,
...14.3.10,
...14.5

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