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我試過使用boost語義操作。在我的情況下,boost::bind
是最簡單的解決方案。第一個例子很好,這裏我只用一個參數進行語義操作。爲什麼boost :: spirit :: qi語義動作在使用boost :: bind時有兩個參數?
#include <boost/config/warning_disable.hpp>
#include <boost/spirit/include/qi.hpp>
#include <boost/bind.hpp>
#include <iostream>
namespace qi = boost::spirit::qi;
// A plain function
void print(int const& i)
{
std::cout << i << std::endl;
}
int main()
{
using boost::spirit::qi::int_;
using boost::spirit::qi::parse;
char const *first = "{44}", *last = first + std::strlen(first);
parse(first, last, '{' >> int_[boost::bind(&print, _1)] >> '}');
return 0;
}
我試過擴展我的代碼。在第二種情況下,我想將兩個參數傳遞給綁定函數,但編譯器不會編譯此代碼。什麼失敗?我沒有找到任何例子。 (int_ >> 「」>的形成 -
#include <boost/config/warning_disable.hpp>
#include <boost/spirit/include/qi.hpp>
#include <boost/bind.hpp>
#include <iostream>
namespace qi = boost::spirit::qi;
// A plain function
void print(int const& i1, int const& i2)
{
std::cout << i1 << "," << i2 << std::endl;
}
int main()
{
using boost::spirit::qi::int_;
using boost::spirit::qi::parse;
char const *first = "{44,55}", *last = first + std::strlen(first);
parse(first, last, '{' >> (int_ >> "," >> int_)[boost::bind(&print, _1,_2)] >> '}');
return 0;
}