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D3DXMATRIXA16 and std::vector

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I have a problem that basically I am stumped on. It goes a little something like this.
#include <vector>
#include <Windows.h>
#include <d3dx9.h>

class Bullshit
    D3DXMATRIXA16 m_mat;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
    std::vector <Bullshit> vec;

That's the little test program I made to ensure I wasn't insane. When I compile it, I get this error:
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\vector(507) : error C2719: '_Val': formal parameter with __declspec(align('16')) won't be aligned
        d:\Mezz\Poo\App.cpp(14) : see reference to class template instantiation 'std::vector<_Ty>' being compiled
If I take out the matrix member, it's fine. If I make it a vector of pointers to the class, it's fine. But why doesn't it work like that? I would prefer to use a 16-byte aligned matrix if possible... -Mezz

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