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Roleplaying Games Book Compilation Error

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When I have... IDirect3D9 g_D3D; if ((g_D3D=Direct3DCreate9(D3D_SDK_VERSION) == NULL) { // err code } I get a compilation error saying 'IDirect3D9': cannot instantiate abstract class. Should this be initialized as a pointer? Ie 'IDirect3D9 *g_pD3D'? Is this an error in the book?

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