On Mon, May 10, 2010 at 12:58 PM, Daniel Pfeifer <daniel@pfeifer-mail.de> wrote:
Hi Emil and others,
Qt 4.6 brought support for some vector and matrix types.
While it is easy to define matrix_traits for QGenericMatrix and QMatrix4x4, i am struggling with the vector_traits for QVector2D, QVector3D and QVector4D.
The problem is that Qt's vector types have setters and no non-const-ref getters.
Is there a plan for (Boost).LA to support types with setters?
I started converting to setters and hit a problem I don't have a good solution to. (Boost)LA uses operator| overloads to bind vector and matrix type (elements). For example, for an object v of any vector type you could say: v|row_matrix and it returns a reference to v itself of type that makes it look like a row-matrix. Importantly, this reference is not read-only. Similarly, you could say v|X and it returns a reference to the X element of v. Naturally, you could do: v|X *= 2; to multiply the X coordinate of v by 2. This syntax depends on the vector_traits type to return a mutable reference to a vector's element. This won't work with setters. Ideas? Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode