June 2002
Beginner
759 pages
80h 42m
English
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Name
C_constant
Synopsis
C_constantpackage,subname,default_type,types,indent,breakout, item ...
Returns a list of C subroutine definitions that return the
value and type of constants when passed the name by the XS
wrapper. item... gives a list of
constant names. These can be strings, which are taken as a C macro
name, or references to a hash with the following keys:
nameThe name of the constant, as seen by the Perl code.
typeThe type of the constant (
IV,NV, etc.).valueA C expression for the value of the constant, or a list of C expressions if the type is aggregate. Defaults to
nameif not given.macroThe C preprocessor macro to use in the
#ifdef. Defaults tonameand is primarily used ifvalueis anenum. If a reference or an array is passed, then the first element is used in place of the#ifdefline, and the second element is used in place of the#endif. This allows preprocessor constructions such as:#if defined (foo) #if !defined (bar) ... #endif #endif
which are used to determine if a constant will be defined.
A
macroof1signals that the constant is always defined, so the#if/#endiftest is omitted.defaultDefault value to use (instead of
croaking with “your vendor has not defined . . . ) if the macro isn’t defined. Specifies a reference to an array with type followed by value(s).preC code to use before the assignment of the value of the constant. This allows you to use temporary variables to extract a value from part of a
structand return this asvalue. This C code is placed ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.