小编EHu*_*ala的帖子

是否可以(对A类进行任何修改)进行以下工作？即,使最令人烦恼的解析出错？

class A {
};

int main() {
    A a(); // can this be forced to be an error??
    A b;   // this should work
}

我看到一个错误,我没有看到解决方案.一,相关代码:

namespace C {

    struct RangeEntry {
        size_t byte;
        boost::optional<size_t> bit;
    };

    struct Range {
        RangeEntry firstPart;
        boost::optional<RangeEntry> secondPart;
        boost::optional<size_t> shift;
    };
}

BOOST_FUSION_ADAPT_STRUCT(
    C::RangeEntry,
    (size_t, byte)
    (boost::optional<size_t>, bit)
)

BOOST_FUSION_ADAPT_STRUCT(
    C::Range,
    (C::RangeEntry , firstPart)
    (boost::optional<C::RangeEntry> , secondPart)
    (boost::optional<size_t> , shift)
)

... Declare the rules ...

karma::rule<Iterator, C::Range()> range;
karma::rule<Iterator, C::RangeEntry()> range_part;

... Define rules ...

range_part %= no_delimit[ulong_ << -(lit(":") << ulong_)];
range %= no_delimit[range_part << -(lit("-") << range_part)] << -(lit("<<") << ulong_);

在该range %=部分,我得到编译错误

/usr/include/boost/spirit/home/karma/numeric/detail/numeric_utils.hpp:504:30: …