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Volume 7A: XView Programming Manual
book

Volume 7A: XView Programming Manual

by Dan Heller
October 1994
Intermediate to advanced content levelIntermediate to advanced
770 pages
22h 58m
English
O'Reilly Media, Inc.
Content preview from Volume 7A: XView Programming Manual
The types Xv_public and Xv_private are both defined to be extern to indicate that
they may be called from outside of the files they are declared in. However, the meaning of
these types indicates the intended use of the function. Programmers should never call “pri-
vate” functions, whereas they are allowed to call the public ones. It is assumed that the pri-
vate functions are those that aid in the implementation of the package. Again, functions
should be declared as static whenever possible.
25.5.3 The Package Declaration
A package is declared by initializing a global variable of type Xv_pkg. All the fields of the
data structure are initialized to identify the package. The logo package is declared by creat-
ing a logo_pkg variable of this type.*
Xv_pkg logo_pkg = {
"Logo", /* package name */
ATTR_PKG_UNUSED_FIRST, /* package ID */
sizeof(Logo_public), /* size of the public struct */
WINDOW, /* subclassed from the WINDOW package */
logo_init,
logo_set,
logo_get,
logo_destroy,
NULL /* disable the use of xv_find() */
};
The package ID is set to ATTR_PKG_UNUSED_FIRST because it is assumed that this is the first
unused package in the XView library. In short, a package ID only needs to be distinct from
the IDs of parent and child packages. While this is the only requirement imposed by XView,
it is still recommended that all packages have unique package IDs. The value of the package
ID must fall within the range ...
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Publisher Resources

ISBN: 9780937175873