添加语义动作提振精神分析器时编译错误 [英] Compile error when adding semantic action to Boost Spirit parser
问题描述
由于从用户sehe我现在的地步,我可以帮助
编译我AST。
Thanks to the help from user 'sehe' I'm now at the point where I can compile my ast.
(请在这里看到: http://stackoverflow.com/a/29301655/1835623 )
现在从JEDEC文件中提取的数据字段我需要解析看起来像这样之一:
Now one of the data fields extracted from JEDEC file I need to parse looks like this:
12345 0000100101010111010110101011010
"12345 0000100101010111010110101011010"
我已经建立了一个解析器来消费这些类型的字段:
I already built a parser to consume these kind of fields:
std::string input("12345 010101010101010101010");
std::string::iterator st = input.begin();
qi::parse(st, input.end(), qi::ulong_ >> ' ' >> *qi::char_("01"));
显然没有那么复杂。现在我的问题是,我要分配
的ulong_并使用语义动作二进制串到一些局部变量。这就是我所做的:
Obviously not that complicated. Now my problem is that I want to assign the ulong_ and the binary string to some local variables using a semantic action. This is what I did:
using boost::phoenix::ref;
std::string input("12345 010101010101010101010");
std::string::iterator st = input.begin();
uint32_t idx;
std::string sequence;
qi::parse(st, input.end(),
qi::ulong_[ref(idx) = qi::_1] >>
' ' >>
*qi::char_("01")[ref(sequence) += qi::_2]);
但不幸的是,这并不甚至编译和错误消息我得到
是没有帮助的(至少我)?我想这是简单的东西......但我现在绝望地卡住。 : - (
But unfortunately this doesn't even compile and the error message I get is not helpful (at least to me)? I guess it's something simple... but I'm hopelessly stuck now. :-(
是否有人有一个想法是什么,我做错了?
Does someone have an idea what I'm doing wrong?
推荐答案
有两种方式:
-
解决SA的
fix the SA's
qi::parse(st, input.end(),
qi::ulong_[ref(idx) = qi::_1] >>
' ' >>
qi::as_string[*qi::char_("01")] [phx::ref(sequence) += qi::_1]);
注:
- 是
齐:: _ 1
因为前pression的SA重视不公开两个要素,只有1 - 它的明确的
PHX :: REF
,否则ADL¹将选择的std :: REF
(因为的std ::字符串
) - 使用
as_string
来强迫从STD属性类型::矢量<字符>
- it's
qi::_1
because the expression the SA attaches to doesn't expose two elements, just 1 - it's explicitly
phx::ref
because otherwise ADL¹ will selectstd::ref
(because ofstd::string
) - use
as_string
to coerce the attribute type fromstd::vector<char>
不过,当然,一如既往:提升精神:&QUOT;语义行为是邪恶的&QUOT;?
However, of course, as always: Boost Spirit: "Semantic actions are evil"?
qi::parse(st, input.end(),
qi::ulong_ >> ' ' >> *qi::char_("01"),
idx, sequence
);
使用解析器API绑定到属性引用。
Use the parser API to bind references to attributes.
¹<一href=\"http://stackoverflow.com/questions/8111677/what-is-argument-dependent-lookup-aka-adl-or-koenig-lookup/8111750#8111750\">What是&QUOT;参数依赖性查找&QUOT; (又名ADL,或QUOT; Koenig查找&QUOT;)
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