The complete guide since it is also the definitive reference for templates in general. Before going into the description of our obfuscator, it is necessary to give some basis of the mechanism involved. Concepts, tools, and techniques from boost and beyond by david abrahams and aleksey gurtovoy. We saw last time an example of a factorial using template metaprogramming, now its time for something a little bit more fun. We explain what nc files are and recommend software that we know can open or convert your nc files. The rst article on template metaprogramming 7 was published in 1995. Unsubscribe from digipen game engine architecture club. For h omework, try s olving the hanoi tower problem by. The output of these templates include compiletime constants, data structures, and complete functions. I was motivated to write this after i read eric nieblers thoughtprovoking tiny metaprogramming library article. And the debugging options are poor or at least i dont know how to debug. Metais a macro which exploits template metaprogramming for creating a metaclass for the class, as described later. Net is a practical introduction to the use of metaprogramming to improve the performance and maintainability of your code. Similarly, metaprogramming is writing programs about programs.
This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. These are the sorts of questions i asked myself when i first started looking at template metaprogramming seriously. Template metaprogramming is both a curiosity and a powerful optimisation method. Start with the files list the file structure very much mirrors the book structure if youre looking at the solutions in the generated. Dec 10, 2014 template metaprogramming is much more fun than mere generic classes. So in order for me to fully understand his implementation, i had to do some research on the subject. Programmers must specify their desires by explicitly choosing an implementation, rather than by describing their intent. Template metaprogramming techniques for conceptbased. If you havent then go and read it, then never come back if you value your sanity at all. Metaprogramming with templates yes, the code checks whether the number is a prime number template template argument deduction the values of the sequence will be unpacked into the parameter ns. Jun 10, 20 this feature is not available right now.
These nc files are also known as unidata network common data form files. Such annotation is the only effort required to a programmer for being able to use reflection on a certain class. Things like template, which look really weird but behave in an even more bizarre way. Note that the second parameter is an int, not a type. A metaprogram is a program that generates or manipulates program code. Template metaprogramming tmp is a metaprogramming technique in which templates are used by a compiler to generate temporary source code, which is merged by the compiler with the rest of the source code and then compiled. That book certainly isnt what id call light reading, but it does introduce some valuable techniques. The runtime program is only needed to print out the game world and serialize it for next play. Template metaprogramming can be used to automatically produce the right type.
The use of templates can be thought of as compiletime execution. The nnc algorithm requires users to provide a data matrix m and a desired number of cluster k. Template function can be executed at runtime and constexpr functions can be templated. Jun 21, 2015 essentially, metaprogramming is writing code that writes code hence the meta part. This post starts a series of articles following the contrived and tortuous path down insanity lane. For h omework, try s olving the hanoi tower problem by using template metaprogramming. Template parameters can be types int including enum, short, char, bool etc. If you are here and you have read the previous two parts then you are crazy. Template metaprogramming can acomplish better maintainability.
Reflection support by means of template metaprogramming. Experimenting with metaprogramming by verifying constraints during compilation time one of the simplest and safest methods for a start i always wanted to be somebody, but now i realize i sholdvebeen more specific. An introduction to metaprogramming for scientific computing dr conrad sanderson senior research scientist version 1. These nc files contain a set of machineindependent data formats along with a series of software libraries. An introduction to template metaprogramming barney dellar software team lead toshiba medical visualisation systems. This book avoids abstract theory and instead teaches you solid practices youll find useful immediately. We present nuclear norm clustering nnc, an algorithm that can be used in different fields as a promising alternative to the kmeans clustering method, and that is less sensitive to outliers. There have been some articles dealing with template metaprogramming before over here. On the other hand it might result in code bloat and performance decrease. Template metaprogramming is much more fun than mere generic classes. A pdf printer is a virtual printer which you can use like any other printer. The struct keyword is used to keep the syntax clean. Template metaprogramming for linear algebra leo antunes and markus kruber seminar on automation, compilers, and codegeneration hpac june 2014 leo antunes and markus kruber armadillo. With variadic templates, parameter packs and template aliases.
But most of the time, template metaprogramming is used and useful in small, isolated cases, basically to smooth out bumps and exceptional cases, to make a set of types look and behave uniformly, allowing you to use generic programming more efficiently. Im not an expert in any kind of compile time computing methods but i know that template metaprogramming provides such a functionality. Template metaprogramming is a great technique when used correctly. Metaprogramming with templates yes, the code checks whether the number is a prime number template struct isprime2.
Coes eace i ackowegmes i makig e mos o is ook iii cae ioucio 1 1. What you need to convert a nc file to a pdf file or how you can create a pdf version from your nc file. Template metaprogramming techniques for conceptbased specialization. The type of each attribute is in fact deduced from the class definition, using template metaprogramming. Template metaprogramming tmp in armadillo conclusion armadillo. It can, for the most part, be considered to be programming with types in that, largely, the. It is quite difficult to follow, specially because the practical applications shown are very abstract. Template metaprogramming is an emerging new direction of generative programming.
Although template metaprogramming and compiletime calculations does overlap, main purpose of the templates is to make generic functionclasses. I have very simple program that uses tmp,it calculates the square of a number, but it doesnt seem to. It introduces core concepts like code generation and application composition in clear, easytofollow language, and then it takes you on a deep dive. Originally, templates were designed to enable generic programming and provide type safety. Jun 11, 2015 template metaprogramming john edwards of thatgamecompany digipen game engine architecture club. Another advantage is that you can look at a template class and immediately see if it is a template metaprogram or an ordinary template class.
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