> RT~~~~在VC6下完全没问题
> 
> 
> Compile Error
> 
> Main.cpp
> xutility(764) : error C2039: 'iterator_category' : is not a member of 'T'; Main.cpp(18) : see declaration of 'T'; Main.cpp(72) : see reference to class template instantiation 'std::iterator_traits<_Iter> with [_Iter=T]' being compiled
> xutility(764) : error C2146: syntax error : missing ';' before identifier 'iterator_category'
> xutility(764) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
> xutility(764) : error C2602: 'std::iterator_traits<_Iter> with [_Iter=T]::iterator_category' is not a member of a base class of 'std::iterator_traits<_Iter> with [_Iter=T]'; xutility(764) : see declaration of 'std::iterator_traits<_Iter> with [_Iter=T]::iterator_category'
> xutility(764) : error C2868: 'std::iterator_traits<_Iter> with [_Iter=T]::iterator_category' : illegal syntax for using-declaration; expected qualified-name
> xutility(765) : error C2039: 'value_type' : is not a member of 'T'; Main.cpp(18) : see declaration of 'T'
> xutility(765) : error C2146: syntax error : missing ';' before identifier 'value_type'
> xutility(765) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
> xutility(765) : error C2602: 'std::iterator_traits<_Iter> with [_Iter=T]::value_type' is not a member of a base class of 'std::iterator_traits<_Iter> with [_Iter=T]'; xutility(765) : see declaration of 'std::iterator_traits<_Iter> with [_Iter=T]::value_type'
> xutility(765) : error C2868: 'std::iterator_traits<_Iter> with [_Iter=T]::value_type' : illegal syntax for using-declaration; expected qualified-name
> xutility(766) : error C2039: 'difference_type' : is not a member of 'T'; Main.cpp(18) : see declaration of 'T'
> xutility(766) : error C2146: syntax error : missing ';' before identifier 'difference_type'
> xutility(766) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
> xutility(766) : error C2602: 'std::iterator_traits<_Iter> with [_Iter=T]::difference_type' is not a member of a base class of 'std::iterator_traits<_Iter> with [_Iter=T]'; xutility(766) : see declaration of 'std::iterator_traits<_Iter> with [_Iter=T]::difference_type'
> xutility(766) : error C2868: 'std::iterator_traits<_Iter> with [_Iter=T]::difference_type' : illegal syntax for using-declaration; expected qualified-name
> xutility(768) : error C2039: 'pointer' : is not a member of 'T'; Main.cpp(18) : see declaration of 'T'
> xutility(768) : error C2146: syntax error : missing ';' before identifier 'pointer'
> xutility(768) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
> xutility(768) : error C2602: 'std::iterator_traits<_Iter> with [_Iter=T]::pointer' is not a member of a base class of 'std::iterator_traits<_Iter> with [_Iter=T]'; xutility(768) : see declaration of 'std::iterator_traits<_Iter> with [_Iter=T]::pointer'
> xutility(768) : error C2868: 'std::iterator_traits<_Iter> with [_Iter=T]::pointer' : illegal syntax for using-declaration; expected qualified-name
> xutility(769) : error C2039: 'reference' : is not a member of 'T'; Main.cpp(18) : see declaration of 'T'
> xutility(769) : error C2146: syntax error : missing ';' before identifier 'reference'
> xutility(769) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
> xutility(769) : error C2602: 'std::iterator_traits<_Iter> with [_Iter=T]::reference' is not a member of a base class of 'std::iterator_traits<_Iter> with [_Iter=T]'; xutility(769) : see declaration of 'std::iterator_traits<_Iter> with [_Iter=T]::reference'
> xutility(769) : error C2868: 'std::iterator_traits<_Iter> with [_Iter=T]::reference' : illegal syntax for using-declaration; expected qualified-name
> 
> 
using namespace std; 换成:using std::后面是要用到的容器或者cin,cout,endl等等.