Boost Spirit调试枚举类(c+;+;11)编译错误
我正在尝试调试一个简单的结构,它包含一个带有BOOST\u SPIRIT\u debug\u节点的枚举类,但是我总是得到编译错误“C:\BOOST\BOOST\SPIRIT\home\support\attributes。hpp:1226:错误:无法将'std::basic\u ostream'左值绑定到'std::basic\u ostream&&near'outBoost Spirit调试枚举类(c+;+;11)编译错误,boost,c++11,enums,boost-spirit,boost-spirit-qi,Boost,C++11,Enums,Boost Spirit,Boost Spirit Qi,我正在尝试调试一个简单的结构,它包含一个带有BOOST\u SPIRIT\u debug\u节点的枚举类,但是我总是得到编译错误“C:\BOOST\BOOST\SPIRIT\home\support\attributes。hpp:1226:错误:无法将'std::basic\u ostream'左值绑定到'std::basic\u ostream&&near'out 我不知道为什么会出现这样的右值错误,我试图为操作添加一个手动重载“因为编译器通常会列出所有可用的运算符库的候选重载。我试图定义op
我不知道为什么会出现这样的右值错误,我试图为操作添加一个手动重载“因为编译器通常会列出所有可用的
运算符库的候选重载。我试图定义operator@Xander那么,您的问题将是当时操作员不可见。两个原因:它是在相关实例化之后声明的,或者在定义struct
或enum类的命名空间之外声明的。事实上,在我看来,后者很有可能。
#define BOOST_SPIRIT_DEBUG
#include <boost/spirit/include/qi.hpp>
#include <iostream>
namespace qi = boost::spirit::qi;
struct data_t
{
std::string label;
enum Choice { left, right, up, down } choice;
data_t(std::string label="default", Choice choice=left): label(std::move(label)), choice(choice) {}
friend std::ostream& operator<<(std::ostream& os, Choice const& v) {
switch(v) {
case left: return os << "left";
case right:return os << "right";
case up: return os << "up";
case down: return os << "down";
default: return os << "?";
}
}
friend std::ostream& operator<<(std::ostream& os, data_t const& v) {
return os << "{label:" << v.label << ";choice:" << v.choice << "}";
}
};
template <typename It, typename Skipper = qi::space_type>
struct parser : qi::grammar<It, data_t(), Skipper>
{
parser() : parser::base_type(start)
{
using namespace qi;
choice_.add
("left", data_t::left)
("right", data_t::right)
("up", data_t::up)
("down", data_t::down);
start %= as_string[ lexeme[+graph] ] >> lexeme [choice_];
BOOST_SPIRIT_DEBUG_NODE(start);
}
private:
qi::symbols<char, data_t::Choice> choice_;
qi::rule<It, data_t(), Skipper> start;
};
bool doParse(const std::string& input)
{
typedef std::string::const_iterator It;
auto f(begin(input)), l(end(input));
parser<It, qi::space_type> p;
data_t data;
try
{
bool ok = qi::phrase_parse(f,l,p,qi::space,data);
if (ok)
{
std::cout << "parse success\n";
std::cout << "data: " << data << "\n";
}
else std::cerr << "parse failed: '" << std::string(f,l) << "'\n";
if (f!=l) std::cerr << "trailing unparsed: '" << std::string(f,l) << "'\n";
return ok;
} catch(const qi::expectation_failure<It>& e)
{
std::string frag(e.first, e.last);
std::cerr << e.what() << "'" << frag << "'\n";
}
return false;
}
int main()
{
bool ok = doParse("label1 up");
return ok? 0 : 255;
}
#define BOOST_SPIRIT_DEBUG
#include <boost/spirit/include/qi.hpp>
#include <iostream>
namespace qi = boost::spirit::qi;
struct data_t
{
std::string label;
enum class Choice { left, right, up, down } choice;
data_t(std::string label="default", Choice choice=Choice::left): label(std::move(label)), choice(choice) {}
friend std::ostream& operator<<(std::ostream& os, Choice const& v) {
switch(v) {
case Choice::left: return os << "left";
case Choice::right:return os << "right";
case Choice::up: return os << "up";
case Choice::down: return os << "down";
default: return os << "?";
}
}
friend std::ostream& operator<<(std::ostream& os, data_t const& v) {
return os << "{label:" << v.label << ";choice:" << v.choice << "}";
}
};
template <typename It, typename Skipper = qi::space_type>
struct parser : qi::grammar<It, data_t(), Skipper>
{
parser() : parser::base_type(start)
{
using namespace qi;
choice_.add
("left", data_t::Choice::left)
("right", data_t::Choice::right)
("up", data_t::Choice::up)
("down", data_t::Choice::down);
start %= as_string[ lexeme[+graph] ] >> lexeme [choice_];
BOOST_SPIRIT_DEBUG_NODE(start);
}
private:
qi::symbols<char, data_t::Choice> choice_;
qi::rule<It, data_t(), Skipper> start;
};
bool doParse(const std::string& input)
{
typedef std::string::const_iterator It;
auto f(begin(input)), l(end(input));
parser<It, qi::space_type> p;
data_t data;
try
{
bool ok = qi::phrase_parse(f,l,p,qi::space,data);
if (ok)
{
std::cout << "parse success\n";
std::cout << "data: " << data << "\n";
}
else std::cerr << "parse failed: '" << std::string(f,l) << "'\n";
if (f!=l) std::cerr << "trailing unparsed: '" << std::string(f,l) << "'\n";
return ok;
} catch(const qi::expectation_failure<It>& e)
{
std::string frag(e.first, e.last);
std::cerr << e.what() << "'" << frag << "'\n";
}
return false;
}
int main()
{
bool ok = doParse("label1 up");
return ok? 0 : 255;
}