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problem with static member

Started by MTclip Oct 31, 2005 at 1:40 AM 5 replies 750+ views

Original Post

Oct 31, 2005 at 1:40 AM

I have this struct in one file and i am trying to access the static memeber in another



/// clip from verts.h
struct VERT
{
    D3DXVECTOR3 Position;
    D3DXVECTOR3 Normal;

    const static D3DVERTEXELEMENT9 ele[3];
};

/// clip from load.cpp
pMesh->CloneMesh( D3DXMESH_32BIT, SHADOWVERT::ele, m_pD3dDevice, &pInputMesh );

yes the verts.h header is included in load.cpp it generates this code 3dDrawer error LNK2001: unresolved external symbol "public: static struct _D3DVERTEXELEMENT9 const * const SHADOWVERT::Decl" (?Decl@SHADOWVERT@@2QBU_D3DVERTEXELEMENT9@@B) can anyone explain to me what is goin on here I thought i had the static thing down thanks for any help

joanusdmentia

Oct 31, 2005 at 1:50 AM

Because you only have a declaration, not a definition. To resolve this you need the following in an appropriate .cpp file somewhere:

const D3DVERTEXELEMENT9 VERT::ele[3];

JohnBolton

Oct 31, 2005 at 1:52 AM

Declaring a static variable in a class just informs everyone of its existence, but it doesn't actually create the variable. You need to put:

    D3DVERTEXELEMENT9 const VERT::ele[3] = { ... };

in a source file somewhere.

Grain

Oct 31, 2005 at 1:58 AM

Isn’t it possible to make a member function that returns a reference to it instead ?

joanusdmentia

Oct 31, 2005 at 2:05 AM

Quote:
Original post by Grain
Isn’t it possible to make a member function that returns a reference to it instead ?

No. Unless you have a declaration somewhere the variable simply doesn't exist, so you can't reference it. You could have such a member function AS WELL AS the declaration for the static member, but I can't imagine of what use that would be.

MTclip

Oct 31, 2005 at 2:16 AM

ok so i added this

const D3DVERTEXELEMENT9 VERT::ele[3] ={    { 0, 0,  D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_POSITION, 0 },    { 0, 12, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_NORMAL,   0 },    D3DDECL_END()};

and no matter where i put that at it screams redefinition

Cocalus

Oct 31, 2005 at 2:47 AM

Change

pMesh->CloneMesh( D3DXMESH_32BIT, SHADOWVERT::ele, m_pD3dDevice, &pInputMesh );

pMesh->CloneMesh( D3DXMESH_32BIT, VERT::ele, m_pD3dDevice, &pInputMesh );

I'm assuming SHADOWVERT is an instance of VERT and not derived from it. And your aware that's there only one VERT::ele in your program, no matter how many instances of VERT you have (including none) right?

[Edited by - Cocalus on October 31, 2005 3:47:22 AM]

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