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View Compilation Error

0_0_28432835_23460.cpp
VC2013\INCLUDE\xstddef(328) : error C2338: The C++ Standard doesn't provide a hash for this type.
        VC2013\INCLUDE\type_traits(572): 参见对正在编译的类 模板 实例化“std::hash<_Kty>”的引用
        with
        [
            _Kty=std::pair<int,int>
        ]
        VC2013\INCLUDE\xhash(196): 参见对正在编译的类 模板 实例化“std::is_empty<_Hasher>”的引用
        with
        [
            _Hasher=std::hash<std::pair<int,int>>
        ]
        VC2013\INCLUDE\xhash(220): 参见对正在编译的类 模板 实例化“std::_Hash_oper2<false,_Hasher,_Keyeq>”的引用
        with
        [
            _Hasher=std::hash<std::pair<int,int>>
,            _Keyeq=std::equal_to<std::pair<int,int>>
        ]
        VC2013\INCLUDE\unordered_set(21): 参见对正在编译的类 模板 实例化“std::_Uhash_compare<_Kty,_Hasher,_Keyeq>”的引用
        with
        [
            _Kty=std::pair<int,int>
,            _Hasher=std::hash<std::pair<int,int>>
,            _Keyeq=std::equal_to<std::pair<int,int>>
        ]
        VC2013\INCLUDE\xhash(255): 参见对正在编译的类 模板 实例化“std::_Uset_traits<_Kty,std::_Uhash_compare<_Kty,_Hasher,_Keyeq>,_Alloc,false>”的引用
        with
        [
            _Kty=std::pair<int,int>
,            _Hasher=std::hash<std::pair<int,int>>
,            _Keyeq=std::equal_to<std::pair<int,int>>
,            _Alloc=std::allocator<std::pair<int,int>>
        ]
        VC2013\INCLUDE\unordered_set(58): 参见对正在编译的类 模板 实例化“std::_Hash<std::_Uset_traits<_Kty,std::_Uhash_compare<_Kty,_Hasher,_Keyeq>,_Alloc,false>>”的引用
        with
        [
            _Kty=std::pair<int,int>
,            _Hasher=std::hash<std::pair<int,int>>
,            _Keyeq=std::equal_to<std::pair<int,int>>
,            _Alloc=std::allocator<std::pair<int,int>>
        ]
        0_0_28432835_23460.cpp(52): 参见对正在编译的类 模板 实例化“std::unordered_set<std::pair<int,int>,std::hash<_Kty>,std::equal_to<_Kty>,std::allocator<_Kty>>”的引用
        with
        [
            _Kty=std::pair<int,int>
        ]


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