wiki:FrequentlyAskedQuestions

Version 2 (modified by rme, 5 years ago) (diff)

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Frequently Asked Questions about Clozure CL

Lisp

RANDOM always returns the the same sequence of numbers.

In Clozure CL, the initial random state in a thread is always the same. This sometimes shows up in SLIME when people use something like C-c C-r on a form involving RANDOM and are surprised to see the same result every time.

Objective-C Bridge

The #$ reader macro doesn't find certain Cocoa constants.

Some of the "constants" that Cocoa uses are not numeric constants at all, but are actually variables that refer to instances of NSString.

For instance, NSTitledWindowMask is an actual numeric constant, so #$NSTitledWindowMask => 1. On the other hand, NSFontAttributeName is a variable which refers to an NSString. In cases like this, use the #& reader macro: #&NSFontAttributeName =>#<NS-MUTABLE-STRING "NSFont" (#x7FFF701D8410)>.