C ++域特定的嵌入式语言运算符 [英] C++ domain specific embedded language operators

问题描述

在数值语言（Matlab，Fortran）中，范围操作符和语义在使用多维数据时非常方便。
例如：

  A（i：j，k，：n）//表示二维切片B （c：\\ p $ p> 
 
 
不幸的是C ++没有范围操作符（:)。当然它可以使用范围/切片函子来模拟，但语义比Matlab更干净。我是C ++中的原型矩阵/张量域语言，我想知道是否有任何选项来重现范围运算符。 
我仍​​然想依赖于C ++ / prprocessor框架。
 
 
 
到目前为止，我已经看过boost wave，这可能是一个合适的选项。
 
 
 
是否还有其他方法向C ++ DSL引入新的非本地操作符？
 
 
 
我知道你不能添加新的操作符.am专门寻找解决方法。 
我发现了一件事（非常丑陋的黑客，我不打算使用）：
  #define A r）A [range（（（1）？r），（（0）？r））] //假设A overloads [] 
 A（i：j） // abuse ternary operator 
  
 
 
解决方案
之前使用的是编写一个外部预处理器来解析源代码，并用vanilla C ++替换您的自定义运算符的任何使用。为了您的目的， a：b 使用将替换为 a.operator_range_（b） c $ c> operator：（）声明为 range_ operator_range _（）的声明。在您的makefile中，然后添加一个规则，在编译源文件之前对其进行预处理。这可以在Perl中相对轻松地完成。
 
 
 
但是，在过去使用类似的解决方案，我不推荐它。如果您不小心处理和生成源代码，则可能会产生可维护性和可移植性问题。
 
In numerical oriented languages (Matlab, Fortran) range operator and semantics is very handy when working with multidimensional data.
For example:
A(i:j,k,:n) // represents two-dimensional slice B(i:j,0:n)  of A at index k
unfortunately C++ does not have range operator (:). of course it can be emulated using range/slice functor, but semantics is less clean than Matlab.  I am prototyping matrix/tensor domain language in C++ and am wondering if there any options to reproduce range operator. 
I still would like to rely on C++/prprocessor framework exclusively.

So far I have looked through boost wave which might be an suitable option.

is there any other means to introduce new non-native operators to C++ DSL?

I know you cannot add new operators.am specifically looking for workaround.
One thing I came up (very ugly hack and I do not intend to use):
#define A(r) A[range(((1)?r), ((0)?r))] // assume A overloads []
A(i:j); // abuse ternary operator

解决方案
A solution that I've used before is to write an external preprocessor that parses the source and replaces any uses of your custom operator with vanilla C++. For your purposes, a : b uses would be replaced with something like a.operator_range_(b), and operator:() declarations with declarations of range_ operator_range_(). In your makefile you then add a rule that preprocesses source files before compiling them. This can be done with relative ease in Perl.

However, having worked with a similar solution in the past, I do not recommend it. It has the potential to create maintainability and portability issues if you do not remain vigilant of how source is processed and generated.

                        
这篇关于C ++域特定的嵌入式语言运算符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！