Too much cleverness in programming makes designs more complicated, code more fragile, learning curves steeper, and worst of all, it makes debugging harder. Concepts, tools, and techniques from boost and beyond pdf, epub, docx and torrent then this site is not for you. Metaprogramming in c is the art of creating new language constructs, typically using macros. An example of this is an sqrt function that takes an integer i. Metaprogramming allows programs to create methods on the fly instead of having to define them in the program itself. Pdf c template metaprogramming download full pdf book. Template metaprogramming is generally not used in practical programs, it is an interesting conecpt though. Pdf c template metaprogramming download ebook for free. One of the benefits of metaprogramming is that it increases the productivity of developers once they get past the convention over configuration phase in the learning. C template metaprogramming available for download and read online in other formats. Of course, a type cannot be modified, so it has to be right the first time. It took me a lot of time to just digest the facts, almost 40. One of the most common examples of using static code i.
Net is designed to help readers understand the basic concepts, advantages and potential pitfalls of metaprogramming. Work through a list of examples of metaprogramming, including a practical approach to build code that writes code using the ruby programming language. Thank you, john c lilly, and thank you coincidence control publishing for releasing this edition unabridged, straight from johns biocomputer to yours. With variadic templates, parameter packs and template aliases.
Lilly was also a pioneer of float tanks, one of the single greatest external tools for achieving effective selfmetaprogramming, and this book sheds light on the early days of this effort. The compiler has to expand such patterns recursively. Metaprogramming python 3 patterns, recipes and idioms. The if template was the rst control structure in a generic form 3 and the remaining control structures were published in 4.
I was motivated to write this after i read eric nieblers thoughtprovoking tiny metaprogramming library article. A conditional branch can be constructed by writing two alternative specialisations of a template class. Metaprogramming is frowned on in python and considered unpythonic. Programming and metaprogramming in the human biocomputer. Metaprogramming in mathematica mathematica stack exchange. The output of these templates include compiletime constants, data structures, and complete functions.
I read this book as a preface to j c lillys the centre of the cyclone. The rst article on template metaprogramming 7 was published in 1995. Learn why metaprogramming is necessary and look at some of the components of metaprogramming textual macro languages, specialized code generators. The only widely known example of metaprogramming in python was an implementation of a goto and comefrom keyword done as an aprilfools joke. Recently, however, ive faced a problem that could not be solved by the means outlined in the article. With template metaprogramming, you manipulate types, not objects. Read c template metaprogramming online, read in mobile or kindle. Metaprogramming custom control structures in c recently, however, ive faced a problem that could not be solved by the means outlined in the article.
This book mixes a bit of metaprogramming with other template techniques. This is a function that adds its two parameters and stores the result in the result enum member. See how to build a code generator and get a closer look at languagesensitive macro programming in scheme. However, before you get visions in your mind of robots writing code to take over the world, understand that its actually much less intense. Download pdf c template metaprogramming book full free. You can use vi, vim or any other text editor to write your c program into a file. Some argue that there is a sharp learning curve to make complete use of metaprogramming features. Julia tutorial furthermore, julia incorporates in its design important advances in programming languages such as a superb support for parallelization or practical functional programming orientation that were not fully eshed out when other languages for scienti c computation were developed a few decades ago. Since metaprogramming gives more flexibility and configurability. Note that the resulting class must be inserted into the. In this example the metaprogram is not executed until the class template is instantiated. Template metaprogramming is in fact turingcomplete, meaning that any computation expressible by a computer program can be computed, in some form, by a template metaprogram.
Another more recent library that shows it can be done in python is macropy. This tutorial assumes that you know how to edit a text file and how to write source code inside a program file. In order to explain metaprogramming, let me explain a few basic concepts first. A traditional program is mainly code that manipulates a data structure and produces output. Technically metaprogramming is code that writes code. An introduction to metaprogramming for scientific computing dr conrad sanderson senior research scientist version 1. Your contribution will go a long way in helping us serve. You can call this at compile time with something like adder result, which will be expanded at compile time and act exactly like a literal 3 in your program branching.
Since that book is about his the subject is the exploration of human behaviours in solitude with the effect of lsd25 a recreational drug and interpreting the results from a softwareprogramming point of view. Programming and metaprogramming in the human biocomputer, john c. In some cases, this can be used to optimize the eventual runtime of a program. Templates can be used to perform compiletime calculations on data that is known, of course, at compile time. A c program can vary from 3 lines to millions of lines and it should be written into one or more text files with extension. In this article, they attempt to make amends, by helping programmers eschew cleverness. This technique is called template metaprogramming tmp. Learn why metaprogramming is necessary and look at some of the. It introduces core concepts in clear, easytofollow language and then it takes you on a deep dive into the tools and techniques youll use to implement them in your.
Michele and david feel, in part, responsible for some excesses of cleverness in python metaclasses. I described in more fully here where some subtleties associated with it are also described, and used it extensively e. Metaprogramming or more specifically, template metaprogramming is the practice of using templates to create constants, functions, or data structures at compiletime. Having said that, tmp has a reputation for being a gurulevel skill, which is underserved. Great introduction to c metaprogramming by simon tatham can be found here. This allows computations to be performed once at compile time rather than at each run time.
If you create the type sqr, the constant sqr ret is set to 100. Lisp dialects, for example, use the same sexpression representation for code and data, a property called homoiconicity. Metaprogramming with templates yes, the code checks whether the number is a prime number template struct isprime2 static const int resisprime2 res. This makes it possible to create a template which calculates a value at return time, a value which can then be used as a.
Youll explore plenty of realworld examples that reinforce. One of the most underused programming techniques is writing programs that generate programs or program parts. More information about c preprocessor macro programming is available. Levels vvii consist of programming done in the brain on a biological and unconscious level. In some languages, the difference between programming and metaprogramming isnt all that significant. Download c template metaprogramming ebook free in pdf and epub format. Metaprogramming is programming that manipulates programs as data. Levels iiv consist of biological and neurological signals, autonomous and automatic.