Very basic question, but just reading through source code and trying to tell what the ' is for and how it differs from .
Very basic question, but just reading through source code and trying to tell what
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Very basic question, but just reading through source code and trying to tell what the ' is for and how it differs from .
The
'character is used to introduce an attribute.For example,
Integer'Lastis the largest value of typeInteger, andFloat'Digitsis the decimal precision of typeFloat.The complete list of language-defined attributes is in Annex K of the Ada Reference Manual.
It’s also part of the syntax of qualified expressions, such as
Some_Type'(expression).The
.character is used, among other things, to introduce a record component name, such asObj.Comp, whereObjis a record variable andCompis a component of that record.Attributes are defined by the language or by the implementation; component names are defined when the record type is defined.
The apostrophe is also used to delimit character literals:
'x'.