While reviewing Phobos for 64bit systems I noticed two very common coding problems.

1) If you use conditional compilation(version/debug/static if), always
add a sanity check.

### bad ###

version(Windows){
	...
}

version(linux){
	...
}

### god ###

version(Windows){
	...
}else version(linux){
	...
}else{
	pragma(msg, "didn't yet adapt ....");
	static assert(0);
}

2) Reevaluate your use of signed, unsigned integers and their size for iteration purposes - especially as array indexes or pointer offsets.

Maybe size_t and ptrdiff_t are better suited than int/long and uint/ulong?

Thomas