Re: Boolean Operation on pointer (access)

[Jeffrey Carter <jrcarter@acm.org>]

Dominic D'Apice wrote:
> Ok then, i use the clause use in my .ada for my package ads, it's
> working, 
> but i don't understand why i need to put a use clause for only this king
> of operator ?
> 
> For the rest of my .ada program  i only precede each thing by the .ads
> package name 
> Ex : package.var := xxx;

The things in a package mentioned in a context clause ("with") are not 
directly visible. This means you have to precede them with the package 
name to reference them.

You can make everything in a package directly visible by naming the 
package in a use clause. Instead of

X : Package_Name.Var;

X := Package_Name."+" (X, 1);

you can have

use Package_Name;

X : Var;

X := X + 1;

This is not always desirable. To only make the operators of a specific 
type from the package visible, you can name the type in a "use type" clause:

use type Package_Name.Var;

X : Package_Name.Var; -- "Package_Name." needed here

X := X + 1; -- "+" is an operator for Var, so not needed here

-- 
Jeff Carter
"Why don't you bore a hole in yourself and let the sap run out?"
Horse Feathers