shared_ptr.hpp(321) : error C2039: 'type_info' : is not a member of 'std' 错误修正

最新推荐文章于 2022-03-17 13:55:00 发布

do_as_myself

最新推荐文章于 2022-03-17 13:55:00 发布

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本文解决在VC++6.0环境下使用Boost库中的shared_ptr时遇到的编译错误，具体为找不到std::type_info的问题。通过调整代码使其正常编译。

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vc＋＋ 6.0使用boost::shared_ptr（boost版本boost_1_33_1）出现以下错误：

f:/c++/boost_1_33_1/boost/shared_ptr.hpp(321) : error C2039: 'type_info' : is not a member of 'std'
        f:/c++/boost_1_33_1/boost/shared_ptr.hpp(342) : see reference to class template instantiation 'boost::shared_ptr<T>' being compiled
f:/c++/boost_1_33_1/boost/shared_ptr.hpp(321) : error C2039: 'type_info' : is not a member of 'std'
        c:/program files/microsoft visual studio/vc98/include/utility(26) : see reference to class template instantiation 'boost::shared_ptr<class PersistentObject>' being compiled
        c:/program files/microsoft visual studio/vc98/include/xtree(28) : see reference to class template instantiation 'std::pair<class Key const ,class boost::shared_ptr<class PersistentObject> >' being compiled
        c:/program files/microsoft visual studio/vc98/include/map(46) : see reference to class template instantiation 'std::_Tree<class Key,struct std::pair<class Key const ,class boost::shared_ptr<class PersistentObject> >,struct std::map<class Key
,class boost::shared_ptr<class PersistentObject>,struct std::less<class Key>,class std::allocator<class boost::shared_ptr<class PersistentObject> > >::_Kfn,struct std::less<class Key>,class std::allocator<class boost::shared_ptr<class PersistentObje
ct> > >' being compiled
        f:/vc6/tinyorm/orm/abstractmapper.h(96) : see reference to class template instantiation 'std::map<class Key,class boost::shared_ptr<class PersistentObject>,struct std::less<class Key>,class std::allocator<class boost::shared_ptr<class Persis
tentObject> > >' being compiled
PersistentCriteria.cpp
f:/c++/boost_1_33_1/boost/shared_ptr.hpp(321) : error C2039: 'type_info' : is not a member of 'std'
        f:/c++/boost_1_33_1/boost/shared_ptr.hpp(342) : see reference to class template instantiation 'boost::shared_ptr<T>' being compiled
f:/c++/boost_1_33_1/boost/shared_ptr.hpp(321) : error C2039: 'type_info' : is not a member of 'std'
        c:/program files/microsoft visual studio/vc98/include/utility(26) : see reference to class template instantiation 'boost::shared_ptr<class PersistentObject>' being compiled
        c:/program files/microsoft visual studio/vc98/include/xtree(28) : see reference to class template instantiation 'std::pair<class Key const ,class boost::shared_ptr<class PersistentObject> >' being compiled
        c:/program files/microsoft visual studio/vc98/include/map(46) : see reference to class template instantiation 'std::_Tree<class Key,struct std::pair<class Key const ,class boost::shared_ptr<class PersistentObject> >,struct std::map<class Key
,class boost::shared_ptr<class PersistentObject>,struct std::less<class Key>,class std::allocator<class boost::shared_ptr<class PersistentObject> > >::_Kfn,struct std::less<class Key>,class std::allocator<class boost::shared_ptr<class PersistentObje
ct> > >' being compiled
        f:/vc6/tinyorm/orm/abstractmapper.h(96) : see reference to class template instantiation 'std::map<class Key,class boost::shared_ptr<class PersistentObject>,struct std::less<class Key>,class std::allocator<class boost::shared_ptr<class Persis
tentObject> > >' being compiled
PersistentObject.cpp

跟踪发现，原来错误的代码出现在(红色处)：

void * _internal_get_deleter(std::type_info const & ti) const
    {
        return pn.get_deleter(ti);
    }

将代码中的 std::一一去掉后（搜索一下，有好几处），居然编译通过。

分析原因：

type_info 为运行时类型识别功能提供支持，vc＋＋6.0 环境中自带了TYPEINFO.H头文件（在路径C:/Program Files/Microsoft Visual Studio/VC98/Include下），而该文件中定义的class type_info 并不在std 的namespace中。