C Template Metaprogramming

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C template metaprogramming. It can be used for static configuration adaptive programs optimization and much more. In c metaprogramming refers to the use of macros or templates to generate code at compile time. 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 compiledthe output of these templates include compile time constants data structures and complete functionsthe use of templates can be thought of as compile time execution. Constexpr especially in c14 lets you take your runtime code and make it compile time.

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. And there are all the other c developers. Ask question asked 10 years 6 months ago. Static metaprogramming aka template metaprogramming is a great c technique that allows the execution of programs at compile time.

Template meta programming overview. The introduction to template metaprogramming in the guidelines ends uniquely. The output of these templates include compile time constants data structures and. If you have c compiler which supports variadic templates c0x standard you can save fibonacii sequence in a tuple at the compile time.

Template metaprogramming is generally not used in practical programs it is an interesting conecpt though. At runtime you can access any element from that tuple by indexing. The syntax and techniques needed are pretty horrendous. There is a part of c developers that appreciate template metaprogramming.

You are expected to understand basic template syntax and template specialisation and we will build the rest as we go along. If you are forced to you can mark your template implementation in the question constexpr. In general macros are frowned upon in this role and templates are preferred although they are not as generic. A light bulb went off in my head as soon as i read this canonical metaprogramming example.

Today i write about template metaprogramming which is programming with types and not values. Template metaprogramming is a generic programming technique that uses extremely early binding. In this article i intend to explain how to. Getting template metaprogramming compile time constants at runtime.

It can for the most part be considered to be programming with types in that largely the values that tmp works with are specific c types. 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 enthusiastswhich camp do you fall into. In c11 you have to get stupid with recursion. Template metaprogramming is in fact turing complete meaning that any computation expressible by a computer program can be computed in some form by a template metaprogram.

Luckily it is 2017 years after c14 was released so you dont have to use c11. C11 is the first c standard.