On Sat, 25 Jun 2011 15:57:03 +0200, simendsjo <[email protected]>
wrote:
I have a templated struct, and I'd like to check if a given type is this
struct. I have no idea how I should write the is expression..
struct S(int C, int R, T) {
T[C][R] data;
}
template isS(T) {
enum isS = is(T : S); // How can I see if T is a kind of S no
matter what values S is parameterized on?
}
unittest {
static assert(isS!(S!(1,1,float)));
static assert(!isS!(float[1][1]));
}
template isS(T) {
static if ( is( T t == S!(C,R,U), int C, int R, U ) ) {
enum isS = true;
} else {
enum isS = false;
}
}
This works, but I thought the following had been added. Apparently not:
template isS(T) {
static if ( is( T t == S!U, U... ) ) {
enum isS = true;
} else {
enum isS = false;
}
}
As for the weird way to write this, it is caused by some variants of the
isExpression not being available outside static if.
--
Simen
