Question

我正在开发一个使用Boost正则表达式库的程序，我遇到了一个问题，在尝试调用boost :: regex_match（）函数的时候，我遇到了一个奇怪的错误。从未遇到过。这是相关的代码。

boost::regex pattern("REGEX REDACTED");
boost::cmatch what;

XERCES_STD_QUALIFIER cout << "Enter XML Document-Building Commands" << XERCES_STD_QUALIFIER endl;
while(true) {
    // Take the input from the user.
    std::string input;
    XERCES_STD_QUALIFIER cout << ">> ";
    XERCES_STD_QUALIFIER getline(in, input);

    if(boost::regex_match(input, what, pattern)) {
        // whatever
    }
}

这几乎就是我从我的教师为此作业提供的类似程序中取出的示例代码。但是当我尝试编译时，我得到了这个错误。如果有帮助，我正在使用NetBeans 8。

XMLDoc.cpp: In member function ‘void XMLDoc::createDoc(std::istream&)’:
XMLDoc.cpp:164:51: error: no matching function for call to ‘regex_match(std::string&,     boost::cmatch&, boost::regex&)’
XMLDoc.cpp:164:51: note: candidates are:
In file included from /usr/include/boost/regex/v4/regex.hpp:145:0,
                 from /usr/include/boost/regex.hpp:31,
                 from XMLDoc.cpp:13:
/usr/include/boost/regex/v4/regex_match.hpp:44:6: note: template<class BidiIterator, class Allocator, class charT, class traits> bool boost::regex_match(BidiIterator, BidiIterator, boost::match_results<Iterator, Allocator>&, const boost::basic_regex<charT, traits>&, boost::regex_constants::match_flag_type)
/usr/include/boost/regex/v4/regex_match.hpp:44:6: note:   template argument deduction/substitution failed:
XMLDoc.cpp:164:51: note:   deduced conflicting types for parameter ‘BidiIterator’ (‘std::basic_string<char>’ and ‘boost::match_results<const char*>’)
In file included from /usr/include/boost/regex/v4/regex.hpp:145:0,
                 from /usr/include/boost/regex.hpp:31,
                 from XMLDoc.cpp:13:
/usr/include/boost/regex/v4/regex_match.hpp:53:6: note: template<class iterator, class charT, class traits> bool boost::regex_match(iterator, iterator, const boost::basic_regex<charT, traits>&, boost::regex_constants::match_flag_type)
/usr/include/boost/regex/v4/regex_match.hpp:53:6: note:   template argument deduction/substitution failed:
XMLDoc.cpp:164:51: note:   deduced conflicting types for parameter ‘iterator’ (‘std::basic_string<char>’ and ‘boost::match_results<const char*>’)
In file included from /usr/include/boost/regex/v4/regex.hpp:145:0,
                 from /usr/include/boost/regex.hpp:31,
                 from XMLDoc.cpp:13:
/usr/include/boost/regex/v4/regex_match.hpp:68:13: note: template<class charT, class Allocator, class traits> bool boost::regex_match(const charT*, boost::match_results<const charT*, Allocator>&, const boost::basic_regex<charT, traits2>&, boost::regex_constants::match_flag_type)
/usr/include/boost/regex/v4/regex_match.hpp:68:13: note:   template argument deduction/substitution failed:
XMLDoc.cpp:164:51: note:   mismatched types ‘const charT*’ and ‘std::basic_string<char>’
In file included from /usr/include/boost/regex/v4/regex.hpp:145:0,
                 from /usr/include/boost/regex.hpp:31,
                 from XMLDoc.cpp:13:
/usr/include/boost/regex/v4/regex_match.hpp:77:13: note: bool boost::regex_match(const std::basic_string<charT, ST, SA>&, boost::match_results<typename std::basic_string<charT, ST, SA>::const_iterator, Allocator>&, const boost::basic_regex<charT, traits>&, boost::regex_constants::match_flag_type) [with ST = std::char_traits<char>; SA = std::allocator<char>; Allocator = std::allocator<boost::sub_match<const char*> >; charT = char; traits = boost::regex_traits<char>; typename std::basic_string<charT, ST, SA>::const_iterator = __gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >; boost::regex_constants::match_flag_type = boost::regex_constants::_match_flags]
/usr/include/boost/regex/v4/regex_match.hpp:77:13: note:   no known conversion for argument 2 from ‘boost::cmatch {aka boost::match_results<const char*>}’ to ‘boost::match_results<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::allocator<boost::sub_match<const char*> > >&’
/usr/include/boost/regex/v4/regex_match.hpp:85:13: note: template<class charT, class traits> bool boost::regex_match(const charT*, const boost::basic_regex<charT, traits>&, boost::regex_constants::match_flag_type)
/usr/include/boost/regex/v4/regex_match.hpp:85:13: note:   template argument deduction/substitution failed:
XMLDoc.cpp:164:51: note:   mismatched types ‘const charT*’ and ‘std::basic_string<char>’
In file included from /usr/include/boost/regex/v4/regex.hpp:145:0,
                 from /usr/include/boost/regex.hpp:31,
                 from XMLDoc.cpp:13:
/usr/include/boost/regex/v4/regex_match.hpp:94:13: note: template<class ST, class SA, class charT, class traits> bool boost::regex_match(const std::basic_string<charT, ST, SA>&, const boost::basic_regex<charT, traits>&, boost::regex_constants::match_flag_type)
/usr/include/boost/regex/v4/regex_match.hpp:94:13: note:   template argument deduction/substitution failed:
XMLDoc.cpp:164:51: note:   ‘boost::cmatch {aka boost::match_results<const char*>}’ is not derived from ‘const boost::basic_regex<charT, traits>’

有人可以帮助我吗？我确定我正确地包含了库，因为我有另一个项目具有完全相同的链接器属性，使用boost :: regex_match函数（减去cmatch对象参数），它工作得很好。

Answer 1

如果您要使用std::string输入，则必须使用boost::smatch代替boost::cmatch。见http://www.boost.org/doc/libs/1_57_0/libs/regex/doc/html/boost_regex/ref/match_results.html。所以你需要做的就是改变

boost::cmatch what;

到

boost::smatch what;

似乎无法在Boost库中使用此功能

1 个答案: