Concepts, tools, and techniques from boost and beyond pdf,, download ebookee alternative successful tips for a improve ebook reading experience. Generic programming and template metaprogramming are not faster than c. Lets explore template metaprogrammingwith a couple of code examples. Tmp doesnt have branching, so we use specialization. I have very simple program that uses tmp,it calculates the square of a number, but it doesnt seem to. Click download or read online button to get e book the boost c libraries book now. The if template was the rst control structure in a generic form 3 and the remaining control structures were published in 4. 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. Things like template, which look really weird but behave in an even more bizarre way. The performance of hardcoded algorithms, and the flexibility and reusability of general, parameterized ones.
Template metaprogramming is turingcomplete, meaning that any computation expressible by a computer program can be computed, in some form, by a template metaprogram. This is typical of cbased libraries, where parameters are. Is template metaprogramming faster than the equivalent c code. Algorithms are expressed using template recursion as a looping construct and class template specialization as a conditional construct. Reflection support by means of template metaprogramming pdf. With help from the excellent boost metaprogramming library, david and aleksey take tmp from the laboratory to the workplace with readable prose and practical examples, showing that compiletime stl is as able as its runtime counterpart. The rst article on template metaprogramming 7 was published in 1995. Reflection support by means of template metaprogramming. Template metaprogramming is both a curiosity and a powerful optimisation method. The output of these templates include compiletime constants, data structures, and complete functions. Concepts, tools, and techniques from boost and beyond pdf, epub, docx and torrent then this site is not for you. So far weve learned the basic constructs of template metaprogramming loops, branching, return values and some basic list operations getting the length of a list, appending and prepending elements, checking if an element is included in a list.
I was motivated to write this after i read eric nieblers thoughtprovoking tiny metaprogramming library article. Template metaprogramming can be used to automatically produce the right type. When c was developed, maths libraries implemented functions such as square. Among the application areas of template metaprograms are the expression templates, static interface checking, code optimization with adaption, language embedding and active libraries. While i consider myself falling rather in the camp of the aficionados, ive met a lot more people that dont have a strong interest for it, or that even find it downright disgusting, than tmp enthusiasts. The compiler acts as an interpreter or a virtual computer that emits the instructions that make up the final program. However, before you get visions in your mind of robots writing code to take over the world, understand that its actually much less intense. In theory, any computable problem can be solved at compile time without ever executing compiled code.
Techniques for making the mpl work on vc6vc7borlandgcc2. Some programs or libraries obfuscate the underlying integer type of. Consider writing a c like printf function in haskell. Metaprogramming with templates yes, the code checks whether the number is a prime number template struct isprime2. Template metaprogramming is a generic programming technique that uses extremely early binding. When implementing an objective function to be optimized, a user may only need to implement a few methods.
The overwhelming majority of generic libraries, including the original version of stl, were written without language support for concepts and used without enforcement mechanisms. It can, for the most part, be considered to be programming with types in that, largely, the. Concepts, tools, and techniques from boost and beyond david abrahams, aleksey gurtovoy this is basically thorough documentation for the boost mpl. There have been some articles dealing with template metaprogramming before over here. Some of the advanced template features utilized by libraries such as boost and stlsoft, and implementations of the stl itself, for template metaprogramming explicit or partial specialization, default template arguments, template nontype arguments, template template arguments. An introduction to template metaprogramming barney dellar software team lead. It seems really cool, make the compiler do most of the work. This post starts a series of articles following the contrived and tortuous path down insanity lane. Static and metaprogramming patterns and static frameworks. Dabei kommen vor allem templates zum einsatz in diesem fall spricht man.
Concepts, tools, and techniques from boost and beyond by david abrahams, aleksey gurtovoy. A metaprogram is a program that generates or manipulates program code. Boost library documentation template metaprogramming. The use of templates can be thought of as compiletime polymorphism. Concepts, tools, and techniques from boost and beyond david abrahams, aleksey gurtovoy. An introduction to metaprogramming for scientific computing dr conrad sanderson senior research scientist version 1. E book the boost c libraries download ebook pdf, epub. After reading these sections the reader will know how to refactor code to move points of variation from the base level to the metaprogramming level. An introduction to template metaprogramming barney dellar software team lead toshiba medical visualisation systems.
Template metaprograms can generate useful code when interpreted by the compiler, such as a massively inlined algorithm that is, an implementation of an algorithm which works for a specific input size, and has its loops unrolled. Template metaprograms consist of class templates operating on numbers andor types as data. This is basically thorough documentation for the boost mpl. 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. They are methods to achieve general, reusable code which is as fast as handcoded, and hardcoded c. Technically metaprogramming is code that writes code. A complete mpl reference manual, in html and pdf form. The library brings together important abstractions from the generic and functional programming worlds to build a powerful and easytouse toolset which makes template. The availability of nontype template parameters makes it possible to perform integer.
This site is like a library, use search box in the widget to get ebook that you want. A macro is a piece of code that executes at compile time and either performs textual manipulation of code tobe compiled e. Demers, a tutorial on behavioral reflection and its. With variadic templates, parameter packs and template aliases. Template metaprogramming is an emerging new direction of generative programming.
389 1596 826 802 399 1482 1043 487 557 387 131 1281 286 1443 1028 759 1557 259 92 1285 492 484 363 433 1031 62 914 30 91 914 1112 819