Custom Query (1030 matches)

SBCL has a sb-debug::backtrace-as-list function which returns the backtrace summary in list form. This is useful for certain kinds of tracing and profiling. The attached diff adds a similar function to OpenMCL/CCL.

Printing NSData objects prints out the data contained within them, which is convenient, but it does not obey *print-length*. This gets particularly annoying when working with images, because if one accidentally prints a very large NSData object in the IDE (which often happens during error reporting when such an object has been passed in as an argument), Hemlock chokes, and the only way to recover is to kill the current listener and fire up a new one.

ClozureCL seems to switch to scientific notation when doing format ~F before the number becomes too large or small.

Example:

CCL> (format t "~F" 0.0001)
1.0E-4  ;; Expected: 0.0001

From CLHS Section 22.3.3.1:

If w is omitted, then if the magnitude of arg is so large (or, if d is also omitted, so small) that more than 100 digits would have to be printed, then an implementation is free, at its discretion, to print the number using exponential notation instead, as if by the directive ~E (with all parameters to ~E defaulted, not taking their values from the ~F directive).

I read that to mean that if less than 100 digits would be printed, then it's required to use fixed point representation.

MCL 5.0 actually gets this right, so I/we/somebody might be able to merge code from MCL's Lib/format.lisp into CCL's file of the same name.