Struct from Windows.h is Undeclared

Question

I am trying to use the tagRAWINPUTDEVICE struct from WinUser.h.

(Edited) Here is all of my code:

#define WINVER 0x0A00
#define _WIN32_WINNT 0x0A00

#include <Windows.h>

int main()
{
    RAWINPUTDEVICE rid[1];
    return 0;
}

I compile the code with:

g++ test.cpp

I get this error:

test.cpp: In function `int main()':
test.cpp:8: `RAWINPUTDEVICE' undeclared (first use this function)
test.cpp:8: (Each undeclared identifier is reported only once
test.cpp:8: for each function it appears in.)
test.cpp:8: parse error before `['

Here is the struct from WinUser.h:

typedef struct tagRAWINPUTDEVICE {
    USHORT usUsagePage; // Toplevel collection UsagePage
    USHORT usUsage;     // Toplevel collection Usage
    DWORD dwFlags;
    HWND hwndTarget;    // Target hwnd. NULL = follows keyboard focus
} RAWINPUTDEVICE, *PRAWINPUTDEVICE, *LPRAWINPUTDEVICE;

I don't see any other requirements in the documentation, so I don't see why there is an error.