Ada distilled: Introduction for experienced programmers by Richard Riehle

By Richard Riehle

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If none is found, the program will crash and burn. You might want to have a function with an access parameter. This has potential side effects. Value := Fix_It_Data; return The_Data; end Fix_It_B; ------- 1 Access parameter and access result 2 Declare initialized Integer object 3 4 Assignment allowed to component 5 Yes. Returns updated value for The_Data 6 Always include the name of the function This is one of Ada's rare weaknesses vis a vis C++. In C++ we can declare a function as const or a parameter as const.

A function may be called in an assignment statement or as an argument within another function or procedure call. Ada also allows pointers (access types) to functions and procedures. 'Z' => null; when others => Result := False; exit; end case; end loop; return Result; end Is_Valid; -- 1 Default mode is in for type String -- 2 Boolean defined in package Standard -- 3 Return type named Result as local variable -- 4 Begin the handled-sequence of statements -- 5 I takes the index type of String: Positive -- 6 Examine a single character from the String -- 7 Check both upper and lower case -- 8 No break statement is required -- 9 others required if not all options are covered -- 10 Simple assignment of Boolean value -- 11 exit leaves the loop.

The next difference is Line 4. N1 is an aliased declared value. A general access type may only reference aliased values. The reserved word, aliased, is required under most circumstances. Tagged type parameters for subprograms are automatically aliased. Line 8 is a direct assignment to an aliased value. This is legal. Contrast this with Line 11, which is not legal. Do you see that Line 11 is not legal because N2, on line 5, is not aliased? 1 Preventing General Access Type Errors There is a potential danger with direct assignment to pointers.

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