Well, there is a way but it might wreak havoc on your object size
since it will instantiate a lot of templates. Therefore it would be a
good thing to only do it in debug mode:
import std.string;
class A
{
int opIndexDebug(int line = __LINE__, string file = __FILE__)(int x)
{
/* do a bunch of checks */
throw new Exception(format("%s: %s", file, line));
int value;
/* compute value */
return value;
}
debug
alias opIndexDebug opIndex;
else
alias opIndexDebug!(__LINE__, __FILE__) opIndex;
}
void main()
{
auto a = new A;
auto b = a[1];
}
You see, when using debug mode it gets instantiated on every call
site, whereas in release mode it uses one hardcoded template instance.
Of course you might want the file/line in release mode too, in that
case get rid of the aliases and just use the templated opIndex (but
then again DMD doesn't merge templates so this could be a hit on
performance).
