From: Brian Candler <b.candler@...>
Date: 2009-01-22T06:48:49+09:00
Subject: Re: class doesn't know about calling program's libraries?

Tom Cloyd wrote:
> Inside the class is this line -
> 
> opt = Readline::readline( ":: " )
> 
> which generates this error -
> uninitialized constant SetLogLevel::Readline (NameError)

At a guess: you are running this *before* you have done require 
'readline'

The easiest solution is to put

    require 'readline'

at the top of this source file. If it has already been required, this 
will do nothing; but if it has not already been required, it will load 
it in.

> Two questions:
> 1. Is my class really so unaware of the calling program's namespace (I
> rather think yes).

I am not sure what you mean about this. Constants are searched for in 
your own class, encoding classes/modules, and the top level.

You can say ::Readline instead of Readline if you mean "I must use the 
one defined in the top level", but this will only make a difference if 
your class has its own Readline as well, in which case a bare 'Readline' 
will use the one within your class.

> 2. If so, what is the best way to make sure the class has access to the
> libraries already loaded in the calling program?

require 'filename_containing_library' at the top of each source file 
which makes use of the class(es) defined in that library.
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