boost::xpressive::op::str — str 是一个 PolymorphicFunctionObject,用于将 sub_match 转换为等效的 std::string。
// In header: <boost/xpressive/regex_actions.hpp> struct str { // member classes/structs/unions template<typename Sig> struct result { }; template<typename This, typename Sub> struct result<This(Sub)> { // types typedef remove_reference< Sub >::type::string_type type; }; // public member functions template<typename Sub> Sub::string_type operator()(Sub const &) const; };
str 公共成员函数template<typename Sub> Sub::string_type operator()(Sub const & sub) const;
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