C++ - 将istream_iterator与wstringstream一起使用

我正在尝试为我编写的程序添加Unicode支持.我的ASCII代码已编译并具有以下行:

std::stringstream stream("abc");
std::istream_iterator it(stream);

我将其转换为:

std::wstringstream stream(L"abc");
std::istream_iterator it(stream);

我在istream_iterator构造函数中收到以下错误:

error C2664: 'void std::vector<_Ty>::push_back(std::basic_string<_Elem,_Traits,_Alloc> &&)' : cannot convert parameter 1 from 'std::basic_string<_Elem,_Traits,_Alloc>' to 'std::basic_string<_Elem,_Traits,_Alloc> &&'
1>          with
1>          [
1>              _Ty=std::wstring,
1>              _Elem=wchar_t,
1>              _Traits=std::char_traits,
1>              _Alloc=std::allocator
1>          ]
1>          and
1>          [
1>              _Elem=char,
1>              _Traits=std::char_traits,
1>              _Alloc=std::allocator
1>          ]
1>          and
1>          [
1>              _Elem=wchar_t,
1>              _Traits=std::char_traits,
1>              _Alloc=std::allocator
1>          ]
1>          Reason: cannot convert from 'std::basic_string<_Elem,_Traits,_Alloc>' to 'std::basic_string<_Elem,_Traits,_Alloc>'
1>          with
1>          [
1>              _Elem=char,
1>              _Traits=std::char_traits,
1>              _Alloc=std::allocator
1>          ]
1>          and
1>          [
1>              _Elem=wchar_t,
1>              _Traits=std::char_traits,
1>              _Alloc=std::allocator
1>          ]
1>          No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called

将上面的代码转换为Unicode的正确方法是什么？

谢谢.

PS

我正在运行Visual Studio 2012