boost :: spirit :: qi [英] boost::spirit::qi

问题描述

请考虑以下代码：（boost :: spirit 2.5.1）

Consider the following code: (boost::spirit 2.5.1)

qi::parse(str.begin(), str.end(), (+qi::alpha)[[](const string& s){cout << s<< '\n';}]
                                    >> (*(qi::char_(',') | qi::char_('\'')))
                                    >> qi::uint_[[](int integer){cout << integer << '\n';}]);

[[（整数）{cout<<<

The "[[](int integer){cout << integer << '\n';}]" works, but the analogous code for "+qi::alpha" doesn't.

如何更正代码？

推荐答案

您的代码给我以下编译器错误，跳过一些位

Your code gives me the following compiler error, skipping some bits

/usr/include/boost/spirit/home/support/action_dispatch.hpp:142:13:
error: no matching function for call to
‘action_dispatch<>::do_call(
    const main()::<lambda(const string&)>&,
    action_dispatch<>::fwd_tag<std::vector<char>>,
...

这可以归结为传递给您的lambda的参数是向量< char> ，而不是 string

which boils down to that the argument passed to your lambda is vector<char>, not string

code> ：

So, replace string with vector<char>:

(+qi::alpha)[[](const std::vector<char>& s) {
      cout << std::string(s.begin(), s.end()) << '\n';
}]

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