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Chapter 3 Ada Language Reference

Example 3-6 Example Code Causing Ambiguous Selection of Overloaded Operators

function "*" (left:SB0; right:SB1) return SL0;

function "*" (left:SB0; right:SB1) return SS0;

function "*" (left:SL0; right:SL0) return SL0;

function "*" (left:SS0; right:SL0) return SL0;

function TO_SLO (left:SL0) return SL0;

V1 : SB0; V2 : SB1: VL:SL0;

begin

VL := V1 * V2 * VL --ambiguous

VL := TO_SL0(V1 * V2) * VL; --unambiguous expression

end;

The first assignment is ambiguous because there is more than one choice of

the overloaded operator function that would satisfy the first multiplication

subexpression. The second assignment is not ambiguous because the

TO_SLO function is unary and not overloaded. Therefore, the unary

function is forcing the

V1*V2 subexpression to return a SL0 result. Thus,

there is only one operator that satisfies the second example.

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National-instruments AutoCode NI MATRIX Bedienungsanleitung Seite 99