August 1997
Intermediate to advanced
432 pages
12h 19m
English
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Chapter 17. Template-DrivenCode Generation
I’d rather write programs to write programs than write programs.
—Programming Pearls, Communications of the ACM,
Sept. 1985
This chapter builds a template-driven code generator, an
indispensable tool in a C, C++, or Java programmer’s toolbox.
The chapter has two objectives: to make the case for code generation
as a method of code reuse and to present a small but nontrivial
problem that can exercise all the Perl concepts you learned in the
first half of the book: complex data structures, modules, objects,
and eval. Enjoy!
On Code Generation
Programmers create and use tiny
specification languages all the time. Database schemas, resources
(rc files in Unix such as
.mwmrc and .openwinrc),
user interface specifications (Motif UIL files), network interface
specifications (RPC or CORBA IDL files), and so on are all examples
of such languages. These languages enable you to state your
requirements in a high-level, compact, and declarative format; for
example, in Motif’s UIL (User Interface Language), you can
simply state that you want two buttons inside a form and spare
yourself the effort of writing 20 or so statements in C to achieve
the same effect.
The semantic gap between these specification languages and conventional systems-programming languages such as C or C++ can be bridged in one of two ways. The first approach is for the C application to treat the specification as meta-data; that is, the application embeds the specification parser and ...
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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.
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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.