On 04/01/2010 12:38 PM, BCS wrote:
Hello Ellery,
this is going to be a bit of a nebulous question, but
if I define a template
template T(string s){
}
where s is an identifier, then is there a good way to branch T's
behavior based on whether s is declared in the scope in which T gets
instantiated?
some combination of "is()" "typeof" and "mixin()" should do it.
//untested
static if( mixin("is("~s~")") ) { ... }
All right, here's a first try:
//// test.d
module test;
import tok;
int a; //1
void main(){
int a; //2
void dummy(){};
mixin T!("a");
}
//// tok.d
module tok;
int a; //3
template T(char[] k){
static if (is(typeof(mixin(k)))){
pragma(msg,"true");
static if(is(typeof(mixin("."~k)))){
pragma(msg,"uh oh");
}
const K = true;
}else{
pragma(msg,"false");
const K = false;
}
}
The problem I see is it can't distinguish between 1 or 2 and 3
