Ada Programming/Attributes/'Copy Sign
function
S'Copy_Sign (Value, Sign : T)return
T
Description
editS'Copy_Sign(X, Y) is an Ada attribute where S is any floating-point type, and X and Y are any instance of that type. This attribute represents the floating point value with the magnitude of X and the sign of Y.
If the resulting value is outside the base range of S, a Constraint_Error exception is raised.
Example
editX : Float := 1.5; Y : Float := -1.0; Z : Float := 1.0;pragma
Assert (Float'Copy_Sign ( X, Y) = -1.5); -- OKpragma
Assert (Float'Copy_Sign ( X, Z) = 1.5); -- OKpragma
Assert (Float'Copy_Sign (-X, Z) = 1.5); -- OKpragma
Assert (Float'Copy_Sign ( Y, Z) = -1.0); -- Wrong