HELP XtN                                        Jonathan Meyer, Aug 1990

XtN is a macro for managing fixed address string constants used by the X
toolkit. It takes one argument, and returns a fixed-address
null-terminated string version of that argument. So

    (XtN abc) =>
    ** abc 
    (XtN abc).isstring =>
    ** true
    (XtN abc).explode =>
    ** 97 98 99 0

XtN uses a cache to store these strings, so repeated use of the same
string does not cause additional overhead. This means that string
constants created using XtN will be exactly equivelant, so

    (XtN abc) == (XtN abc) =>
    ** true

For debugging purposes, there is a switch called chatty_XtN which, if
true, produces a message when new strings are added to the cache, so

    true -> chatty_XtN;
    XtN new
    ;;; DECLARING XtN STRING CONSTANT new

There are XtC and XtR macros as well, which share the same string cache
with XtN, but print out different messages if chatty_XtN is true:

    XtC New =>
    ;;; DECLARING XtC STRING CONSTANT New
    ** New 


XtNDeclare
----------
The XtN library provides the procedure XtNDeclare for declaring a
list of strings with chatty_XtN locally set to false. This is useful
if you wish to declare a collection of strings at once:

    XtNDeclare([width height translations foreground background);
    XtN width ...

--- C.x/x/pop/help/XtN
--- Copyright University of Sussex 1990. All rights reserved. ----------