分解精神规则的共同部分 [英] Factoring out common parts of Spirit rules

问题描述

我有很多有共同前缀和后缀的规则：

  rule = begin_stuff>一些>其他>> stuff>> end_stuff。 
  

（其中 begin_stuff 和 end_stuff 由文字组成）

我想能够说

  rule = wrapped（some>> other>> stuff）; 
  

我试着沿着

的行

  template< typename Rule>规则包装（规则里面）
 {
规则结果; 
 result = begin_stuff>>内部>> end_stuff; 
 return result; 
} 
  

但是我得到的很多来自Qi的编译时断言。 p>

如何以这种方式重构Spirit规则？

解决方案

您需要使用 Qi Confix Parser Derective 来自精神库。这正是你需要的。

I have a lot of rules that have common prefix and suffix:

rule = begin_stuff >> some >> other >> stuff >> end_stuff.

(where begin_stuff and end_stuff are composed from literals)

I wanted to be able to say

 rule = wrapped(some >> other >> stuff);

I tried something along the lines of

  template<typename Rule> Rule wrapped(Rule inside) 
  {
    Rule result;
    result = begin_stuff >> inside >> end_stuff;
    return result;
  }

but all I get is lots of compile-time assertions from Qi.

How can I refactor Spirit rules in this fashion?

解决方案

I think you need to use the Qi Confix Parser Derective from Spirit Repository. It is exactly what you need.

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