When resizing a multi-dimensional array I receive the warning: d:\microsoft visual studio\vc98\include\xutility(100) : warning C4101: '_Tmp' : unreferenced local variable d:\boost\include\boost-1_31\boost\multi_array.hpp(246) : see reference to function template instantiation 'void __cdecl std::swap(class std::allocator<double> &,class std::allocator<double> &)' being compiled An unreference local variable is not exactly the end of the world, but it is churned out every time a file is compiled that include this function and I'd rather not disable this warning. I can find no mention of anyone else having this problem for such a widely used function (dynamically resizing arrays). The specific line that appears to be causing the problem is: swap(this->allocator_,new_array.allocator_); in "multi_array.hpp" I am resizing the array like so header file: typedef boost::multi_array<double, 2> array2d_type; typedef array2d_type::index index; Class CArrayConfiguration{ ... protected: ... array2d_type m_pReceiveArray; ... }; implementation file: m_pReceiveArray.resize(boost::extents[M][5]); // where M = 10 -> 1000 and it is this line that prompts the warning. I am using MSVC++ 6.0 on WinXP. If I initalising the array to shape and then resize it there is no problem, but I require it to be a class member variable. Thanks in advance, ec