或者放弃使用三元运算符,并直接使用if constexpr,if constexpr的可读性要好过模版特化(C++17) #include <cassert> #include <cmath> #include <iostream> template <int N> int constexpr factorial() { static_assert(N >= 0, "factorial() must
typename T2=void, typename T3=void> class meta_container { public: typedef T0 type; typedef meta_container<T1, T2, T3, void> next_node; // 参数移位了 static const int size = next_node::size + 1; // 非 null_type 模板参数个数 }; template<> // 特例,递归终止 class meta_container<...
template的一个重要使用方法就是template meta programming,它利用编译器对于template的解释是静态的这一特性,让编译器在编译时做计算,可以有效的提高程序的运行速度。有关于 template meta programming的记载,最早见于Erwin Unruh,他在1994年写了一个用template计算质数的程序。我希望通过这篇文章介绍一些TMP的基本技巧和应...
c++ templates template-specialization template-meta-programming Raj*_*esh lucky-day 0推荐指数 1解决办法 188查看次数 模板元编程为此? struct findCategoryByName { string name; bool operator()(const category& a) { return (a.name == name); } }; struct findEntryByName { string name; bool ope...
简要地解释元编程(Meta Programming),元编程类似一个解释器,比如C/C++都是生成了汇编最终生成机器码让计算机运行的。 而模板元编程(TMP)是在C++的体系内,模板实例化后会变成新的代码,但这份新的代码仍然是C++代码,模板的优点就像它的名字一样,套个不同的参数能够刻画出一组组功能相似类型又不同的类或函数。比如...
Reflection Support by means of template Meta-programmingGuiseppe Attardi, Antonio Cisterninohttp://lcgapp.cern.ch/project/architecture/ReflectionPaper.pdf Static Data Structure: Reconciling Template Meta-programming and Generic ProgrammingMichael C. Burton, William G. Griswold, Andrew D. McCulloch, Gr...
of Programming Languages and Compilers Pazmany Peter setahy 1/C H-1117 Budapest, Hungary;Central European functional programming schoolZ. Porkolab: Functional Programming with C++ Template Metaprograms in: Z. Horvath, R. Plasmeijer and V. Zsok (Eds.) Central European Functional Programming School ...
而“执行(解释)”该元程序的就是C/C++预处理器,尽管它们并非为此目的而设计。用户可以通过#define(代码中)或-D(编译命令行中)来控制代码生成过程。这就避免了上面提到的修改build过程的问题,因为“预处理元程序”的解释器就是预处理器!例如,我们可以将上面的tiny_size主模板参数化如下:...
Here is the riddle in short one more: Is Power a function or a metafunction? Hybrid Programming To make it short. The calls Power<0>(10), Power<1>(10), and Power<2>(10) use sharp and round brackets and calculate 10 to the power of 0, 1, and 2. This means 0, 1, and 2 ...
As you will soon see, each meta-operator (like Add, Return, etc.) has a field called id. We can use this field to find out what kind of base-type the template has. In this context, a base-type has nothing to do with inheritance and polymorphism. I'm not sure if this is ...