• The Anh Tran (11/11) May 06 2009 Hi,
• Trass3r (2/6) May 06 2009 You calculate where to point the gun at compile-time?
• The Anh Tran (10/17) May 06 2009 No :)
• Simen Kjaeraas (11/27) May 07 2009 If you want something capable of processing the above, it will

The Anh Tran <trtheanh gmail.com> writes:

Hi,

I'm converting my pet project from C++ to D. It is an aimbot game cheat.
One of my C++ struct is Vector3. It is a wrapper from D3DXVECTOR3.
I would like to use expression template to calculate where to point the 
gun. In C++, it is provided by boost::proto or boost::ublas.

My naive implementation (in fact, "copy&paste" from c++ book "thinking 
in c++") refused to compile.
I've searched dsource.org; the nearest match is Don's BLADE library.

Is there any tutorial, or simpler way to do expression in D; without 
building AST as in BLADE?

Thanks.

Trass3r <mrmocool gmx.de> writes:

The Anh Tran schrieb:
 One of my C++ struct is Vector3. It is a wrapper from D3DXVECTOR3.
 I would like to use expression template to calculate where to point the 
 gun. In C++, it is provided by boost::proto or boost::ublas.
 

You calculate where to point the gun at compile-time?

The Anh Tran <trtheanh gmail.com> writes:

Trass3r wrote:
 The Anh Tran schrieb:
 One of my C++ struct is Vector3. It is a wrapper from D3DXVECTOR3.
 I would like to use expression template to calculate where to point 
 the gun. In C++, it is provided by boost::proto or boost::ublas.

 
 You calculate where to point the gun at compile-time?

No :)

I would like to learn D template programming; all i need is just a 
compile-time expression.

vPredicted = vEnd
+ (((ProjectileSpeed^2 * |vStart-vEnd|^2 - |(vStart-vEnd) X Velocity | 
^2) ^ 0.5
+ (vStart-vEnd) * vVelocity) / (ProjectileSpeed^2 - |vVelocity|^2)) * 
vVelocity

vXYZ is a struct, re-present 3D coordinate / velocity vector.

"Simen Kjaeraas" <simen.kjaras gmail.com> writes:

On Thu, 07 May 2009 03:31:46 +0200, The Anh Tran <trtheanh gmail.com> wrote:

 Trass3r wrote:
 The Anh Tran schrieb:
 One of my C++ struct is Vector3. It is a wrapper from D3DXVECTOR3.
 I would like to use expression template to calculate where to point  
 the gun. In C++, it is provided by boost::proto or boost::ublas.

  You calculate where to point the gun at compile-time?

 No :)

 I would like to learn D template programming; all i need is just a  
 compile-time expression.

 vPredicted = vEnd
 + (((ProjectileSpeed^2 * |vStart-vEnd|^2 - |(vStart-vEnd) X Velocity |  
 ^2) ^ 0.5
 + (vStart-vEnd) * vVelocity) / (ProjectileSpeed^2 - |vVelocity|^2)) *  
 vVelocity

 vXYZ is a struct, re-present 3D coordinate / velocity vector.

If you want something capable of processing the above, it will
probably have to work along the lines of BLADE: use a CTFE function
to parse the string and turn it into whatever code you prefer it to
be.

I do not believe there is such a library in existence, though I may
of course be wrong.

As for which functions are CTFE-able:
 http://digitalmars.com/d/2.0/function.html#interpretation

--
  Simen