On Wed, 28 Jun 2006 00:05:47 -0400, David Abrahams <dave@boost-consulting.com> wrote:
Gennaro Prota <gennaro_prota@yahoo.com> writes:
The real somersaults begin when you want the multidimensional case :) Here's what came out:
I'm pretty sure it's easier than this. IIRC, the macro can still do the old sizeof(a)/sizeof(a[0]) trick; it just needs to add something that will cause an error if a is not an array.
Sure that's easy for monodimensional arrays. When you write something like, for instance, COUNT_OF_N(3, x) though, it's not enough to check that x is an array. It shall be an array, x[0] shall be an array, x[1] and x[2] shall be arrays. I can imagine implementing it with some pp-lib iteration which automatically generates sizeof(x[0])/sizeof(x[0][0]) sizeof(x[0][0])/sizeof(x[0][0][0]) sizeof(x[0][0][0])/sizeof(x[0][0][0][0]) up to a given limit, but I'm not sure it can *reliably* be done with templates only. Suggestions are welcome. During my attempts I came out with some simpler solutions but they ICEd as soon as I invoked the macro in non trivial expressions. This is the solution which seemed more robust so far. FWIW, my opinion is that for VC6 we should only support the 1-dimensional case. --Gennaro.