c++ - 升压::精神::莱克斯；如何指定标记“||”？

Question

所以我的问题很简单，在我的词法分析器类（扩展lex::lexer<T>）中，我有以下内容；

this->self.add
    ...
    ("&&", AND_AND)
    ("||", OR_OR)
    ...

在我的构造函数内部，它编译得很好，但在运行时触发了 SegFault。问题很明显|是正则表达式系统中的“或”运算符，我该如何解决这个问题？

Answer 1

From http://www.boost.org/doc/libs/1_54_0/libs/spirit/doc/html/spirit/lex/quick_reference/lexer.html

\X

If X is a, b, e, n, r, f, t, v then the ANSI-C interpretation of \x. Otherwise a literal X (used to escape operators such as *)

So you would use

 ("\\|\\|", OR_OR)

The first backslash in each pair is treated as an escape character by the C++ string parser, causing the second one to be placed into the string content. That backslash in the string content then is seen by Spirit::Lex and acts to escape the regex operator.