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. The if template was the rst control structure in a generic form 3 and the remaining control structures were published in 4. However, if we wrap it in a struct, we can return the struct. Template metaprogramming is a generic programming technique that uses extremely early binding. Therefore, i call this projecttechnique template metaprogramming programming. It can, for the most part, be considered to be programming with types in that, largely, the. Things like template, which look really weird but behave in an even more bizarre way. A metaprogram is a program that generates or manipulates program code. I have very simple program that uses tmp,it calculates the square of a number, but it doesnt seem to. The rst article on template metaprogramming 7 was published in 1995.
Metaprogramming in c is the art of creating new language constructs, typically using macros. It seems really cool, make the compiler do most of the work. Metaprogramming or more specifically, template metaprogramming is the practice of using templates to create constants, functions, or data structures at compiletime. These utilities are in the boostmpl namespace, which are referred to as mpl, omitting boost to make code examples more compact. This could be done to improve your programs runtime performance in exchange for slower compile times or. Youll explore plenty of realworld examples that reinforce key concepts. This document was created by an unregistered chmmagic. And inspiring introduction to template metaprogramming. Metaprogramming is a programming technique in which computer programs have the ability to treat other programs as their data. Template metaprogramming is generally not used in practical programs, it.
This allows computations to be performed once at compile time rather than at each run time. Lets cover variable templates first, because theyre a lot like class templates. There have been some articles dealing with template metaprogramming before over here. Pdf c template metaprogramming download full pdf book.
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. A metaprogram is a program that generates or manipulates program. Full specialization used when all arguments are specified. Net is designed to help readers understand the basic concepts, advantages and potential pitfalls of metaprogramming. Monkey patching is an object oriented programming technique that allows developers to. Generally, constexprbased solutions are simpler, and promise to get. 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. Mos 4465a is an advanced financial ac modern advanced accounting in canada, 8th edition, mcgraw. Recently, however, ive faced a problem that could not be solved by the means outlined in the article. A complete mpl reference manual, in html and pdf form. An introduction to template metaprogramming barney dellar software team lead toshiba medical visualisation systems.
Mos 4465a is an advanced financial ac gold advanced maximiser with key. Great introduction to c metaprogramming by simon tatham can be found here. I give an introduction to template metaprogramming, show how the typetraits library allows you the use template metaprogramming in a well structured and a portable way, and how you can use constexpr functions to replace template metaprogramming magic with ordinary functions. Concepts, tools, and techniques from boost and beyond pdf, epub, docx and torrent then this site is not for you. The book deals with language aspects, design patterns, examples and applications seen as case studies. It allows even inexperienced programmers to perform compile. Metaprogramming with templates yes, the code checks whether the number is a prime number template struct isprime2. Starting off the list for examples of metaprogramming is monkey patching.
The compiler acts as an interpreter or a virtual computer that emits the instructions that make up the final program. The use of templates can be thought of as compiletime execution. The output of these templates include compiletime constants, data structures, and complete functions. Template specialization a version of a template to use when a specific pattern of arguments are supplied. 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. It can be used for static configuration, adaptive programs, optimization and much more.
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