使用BOOST_FUSION_ADAPT_ADT调整类时出错
Error when adapting a class with BOOST_FUSION_ADAPT_ADT
我有以下类:
#ifndef WFRACTAL_FRACTAL_METADATA_H_
#define WFRACTAL_FRACTAL_METADATA_H_
#include <string>
namespace WFractal {
namespace Fractal {
class Metadata {
public:
void setAuthorName(const std::string &name);
void setAuthorEMail(const std::string &email);
void setBriefDescription(const std::string &brief);
void setCompleteDescription(const std::string &description);
std::string getAuthorName() const;
std::string getAuthorEMail() const;
std::string getBriefDescription() const;
std::string getCompleteDescription() const;
public:
bool operator==(const Metadata &other);
private:
std::string m_name;
std::string m_email;
std::string m_brief;
std::string m_description;
};
} // namespace Fractal
} // namespace WFractal
#endif // !WFRACTAL_FRACTAL_METADATA_H_
我想使用boost::spirit
从以下文件内容中解析它:
metadata {
author = "Me";
email = "myemail";
brief = "brief description";
description = "complete description";
}
我从这个页面上读到,我可以使用BOOST_FUSION_ADAPT_STRUCT
来解析它。这是我的语法模板:
#ifndef WFRACTAL_FRACTAL_PARSER_METADATAGRAMMAR_H_
#define WFRACTAL_FRACTAL_PARSER_METADATAGRAMMAR_H_
#include <boost/fusion/adapted/adt/adapt_adt.hpp>
#include <boost/fusion/include/adapt_adt.hpp>
#include <boost/spirit/include/qi_no_case.hpp>
#include <string>
#include "Fractal/Metadata.h"
BOOST_FUSION_ADAPT_ADT(
WFractal::Fractal::Metadata,
(obj.getAuthorName(), obj.setAuthorName(val))
(obj.getAuthorEMail(), obj.setBriefDescription(val))
(obj.getBriefDescription(), obj.setCompleteDescription(val))
(obj.getCompleteDescription(), obj.setAuthorEMail(val))
)
namespace WFractal {
namespace Fractal {
namespace Parser {
template <typename Iterator>
struct MetadataParser : boost::spirit::qi::grammar<Iterator, Metadata(), boost::spirit::ascii::space_type> {
MetadataParser() : MetadataParser::base_type(start) {
using boost::spirit::qi::int_;
using boost::spirit::qi::lit;
using boost::spirit::qi::double_;
using boost::spirit::qi::lexeme;
using boost::spirit::ascii::char_;
using boost::spirit::ascii::no_case;
quoted_string %= lexeme['"' >> +(char_ - '"') >> '"'];
start %=
no_case[lit("metadata")]
>> '{'
>> no_case[lit("author")] >> '=' >> quoted_string >> ';'
>> no_case[lit("email")] >> '=' >> quoted_string >> ';'
>> no_case[lit("brief")] >> '=' >> quoted_string >> ';'
>> no_case[lit("description")] >> '=' >> quoted_string >> ';'
>> '}'
;
}
boost::spirit::qi::rule<Iterator, std::string(), boost::spirit::ascii::space_type> quoted_string;
boost::spirit::qi::rule<Iterator, Metadata(), boost::spirit::ascii::space_type> start;
};
} // namespace Parser
} // namespace Fractal
} // namespace WFractal
#endif // !WFRACTAL_FRACTAL_PARSER_METADATAGRAMMAR_H_
当我创建这个语法的实例时(总是遵循页面示例),我得到编译器错误:
typedef string::const_iterator StringIterator;
typedef Parser::MetadataParser<StringIterator> MetadataParser;
MetadataParser parser;
我得到了很多错误(典型的boost…),我注意到其中有很多这个错误的副本:
src/Fractal/FileFactory.cpp:27:17: required from here
/usr/include/boost/spirit/home/qi/detail/assign_to.hpp:152:18: error: no matching function for call to ‘boost::fusion::extension::adt_attribute_proxy<WFractal::Fractal::Metadata, 0, false>::adt_attribute_proxy(const std::__cxx11::basic_string<char>&)’
attr = static_cast<Attribute>(val);
我做错了什么?我该怎么修?
编辑
根据m.s.的建议,我添加了#include <boost/spirit/include/support_adapt_adt_attributes.hpp>
标头,但这不起作用。
#ifndef WFRACTAL_FRACTAL_PARSER_METADATAPARSER_H_
#define WFRACTAL_FRACTAL_PARSER_METADATAPARSER_H_
#include <boost/config/warning_disable.hpp>
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix_core.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/spirit/include/phoenix_object.hpp>
#include <boost/fusion/include/io.hpp>
#include <boost/fusion/adapted/adt/adapt_adt.hpp>
#include <boost/fusion/include/adapt_adt.hpp>
#include <boost/spirit/include/support_adapt_adt_attributes.hpp>
#include <string>
#include "Fractal/Metadata.h"
BOOST_FUSION_ADAPT_ADT(
WFractal::Fractal::Metadata,
(obj.getAuthorName(), obj.setAuthorName(val))
(obj.getAuthorEMail(), obj.setAuthorEMail(val))
(obj.getBriefDescription(), obj.setBriefDescription(val))
(obj.getCompleteDescription(), obj.setCompleteDescription(val))
)
namespace WFractal {
namespace Fractal {
namespace Parser {
template <typename Iterator>
struct MetadataParser : boost::spirit::qi::grammar<Iterator, Metadata(), boost::spirit::ascii::space_type> {
MetadataParser() : MetadataParser::base_type(start) {
using boost::spirit::qi::lit;
using boost::spirit::qi::lexeme;
using boost::spirit::ascii::char_;
using boost::spirit::ascii::no_case;
quoted_string %= lexeme['"' >> +(char_ - '"') >> '"'];
start %=
no_case[lit("metadata")]
>> '{'
>> ((no_case[lit("author")] >> '=' >> quoted_string >> ';')
^ (no_case[lit("email")] >> '=' >> quoted_string >> ';')
^ (no_case[lit("brief")] >> '=' >> quoted_string >> ';')
^ (no_case[lit("description")] >> '=' >> quoted_string >> ';'))
>> '}'
;
}
boost::spirit::qi::rule<Iterator, std::string(), boost::spirit::ascii::space_type> quoted_string;
boost::spirit::qi::rule<Iterator, Metadata(), boost::spirit::ascii::space_type> start;
};
} // namespace Parser
} // namespace Fractal
} // namespace WFractal
#endif // !WFRACTAL_FRACTAL_PARSER_METADATAPARSER_H_
嗯。
经过与Modular Boost和git的长期斗争。。。我发现这是一个回归。
此拉取请求部分修复了回归:
- 重新启用对BOOST_FUSION_ADAPT_ADT适配结构#153的支持
遗憾的是,在置换解析器的存在下,它仍然被破坏了。我已经用BOOST_FUSION_ADAPT_STRUCT
进行了测试,以验证它没有以其他方式损坏。
我将把缩小的样本添加到PR中征求意见。同时,这是自制的复制机:
在Coliru上直播
#include <boost/spirit/include/qi.hpp>
#include <boost/fusion/adapted.hpp>
#include <iostream>
class Foo {
public:
char const& getA() const { return a; }
char const& getB() const { return b; }
void setA(char value) { a = value; }
void setB(char value) { b = value; }
private:
char a, b;
};
BOOST_FUSION_ADAPT_ADT(
Foo,
(char const&, char const&, obj.getA(), obj.setA(val))
(char const&, char const&, obj.getB(), obj.setB(val))
)
int main() {
namespace qi = boost::spirit::qi;
boost::spirit::istream_iterator f(std::cin), l; // input e.g. "a=a;b=b;"
Foo foo;
bool r = qi::parse(f, l,
#if 0 // FAILS TO COMPILE
("a=" >> qi::char_ >> ';')
^ ("b=" >> qi::char_ >> ';')
#else // COMPILES WITH FIX FROM PR #153
("a=" >> qi::char_ >> ';')
>> ("b=" >> qi::char_ >> ';')
#endif
, foo);
if (r)
std::cout << "Parsed: " << boost::fusion::as_vector(foo) << "n";
else
std::cerr << "Parse failedn";
}
但是,如果将#if 1
更改为#if 0
,则会得到输出:
Parsed: (a b)
注意当然,这是假设您使用的分支应用了PR 153。
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