提神气:从语义动作改变多个目标领域
boost spirit qi: change multiple target fields from semantic action
我有以下输入 123, test, test456
,我想 运行 一个 boost::qi 语法,以便输出是一个成对的向量,其中每个匹配项都与某种类型相关联信息如:
[(123, Int), (test, String), (test456, String)]
这是我目前一直在尝试的:
enum class MatchType
{
Int,
String
}
在语法中
match = qi::alpha >> *(qi::alnum)[/*How to set the tuple to (matched value _1, string)*/]
| +qi::digit[ /*How to set the tuple to (matched value _1, Int)*/ ]
/* Tied but doesn't compile:
+qi::digit[
[]()
{
phoenix::at_c<0>(_val) = _1;
phoenix::at_c<1>(_val) = MatchType::Int;
}]
*/
qi::rule<Iterator, std::vector<std::pair<MatchType, std::string>>> match;
实现此目标的最佳方法是什么?
我只是建议
#include <boost/fusion/adapted/std_pair.hpp>
以后
my_pair = (qi::attr(MatchType::Int) >> qi::int_)
| (qi::attr(MatchType::String) >> +qi::alnum);
我有以下输入 123, test, test456
,我想 运行 一个 boost::qi 语法,以便输出是一个成对的向量,其中每个匹配项都与某种类型相关联信息如:
[(123, Int), (test, String), (test456, String)]
这是我目前一直在尝试的:
enum class MatchType
{
Int,
String
}
在语法中
match = qi::alpha >> *(qi::alnum)[/*How to set the tuple to (matched value _1, string)*/]
| +qi::digit[ /*How to set the tuple to (matched value _1, Int)*/ ]
/* Tied but doesn't compile:
+qi::digit[
[]()
{
phoenix::at_c<0>(_val) = _1;
phoenix::at_c<1>(_val) = MatchType::Int;
}]
*/
qi::rule<Iterator, std::vector<std::pair<MatchType, std::string>>> match;
实现此目标的最佳方法是什么?
我只是建议
#include <boost/fusion/adapted/std_pair.hpp>
以后
my_pair = (qi::attr(MatchType::Int) >> qi::int_)
| (qi::attr(MatchType::String) >> +qi::alnum);