Ada Programming/Attributes/'Value

Attributes 'Value __TOC__ Description The 'Value attribute is defined for any scalar type. This attribute is a function that parses the string and returns the corresponding type value, if it exists. Leading and trailing spaces are trimmed. function S'Value (Arg: String) return S'Base; If the string does not correspond to any value of the type, then the Constraint_Error exception is raised. There are corresponding attributes for Wide_String and Wide_Wide_String. Don't confuse this attribute with the Ada Programming/Attributes/'Val attribute. Example type My_Enum is (Enum1, Enum2, Enum3); Assert (My_Enum'Value ("ENUM1") = Enum1); OK Assert (My_Enum'Value (" ENUM1 ") = Enum1); OK Assert (My_Enum'Value ("ZOWIE!") = Enum1); Wrong! Constraint_Error is raised See also Wikibook Ada Programming Ada Programming/Attributes Ada Programming/Attributes/'Image Ada Reference Manual 13 3 Operational and Representation Attributes K Language-Defined Attributes Value