Ada Programming/Attributes/'Enum Val

Description Return the enumeration literal represented by a given number. For every enumeration subtype S, S'Enum_Val denotes a function with the following spec: function S'Enum_Val (Arg : <Universal_Integer>) return S'Base; The function returns the enumeration value whose representation matches the argument, or raises Constraint_Error if no enumeration literal of the type has the matching value. This will be equal to the value of the Val attribute in the absence of an enumeration representation clause. This is a static attribute (i.e., the result is static if the argument is static). Example type Enum_Type is (Enum1, Enum2, Enum3); Assert (Enum_Type'Enum_Val(0) = Enum1); OK See also Wikibook Ada Programming Ada Programming/Attributes Ada Programming/Attributes/'Enum_Rep Ada Reference Manual 13 4 Enumeration Representation Clauses K Language-Defined Attributes Ada 2022 Overview 7.13 Getting the representation of an enumeration value External links GNAT Reference Manual > Implementation Defined Attributes > Enum_Val