On Tuesday, 2 June 2015 at 14:07:20 UTC, Alex Parrill wrote:
On Tuesday, 2 June 2015 at 08:10:27 UTC, rsw0x wrote:
exactly what is the difference here?
I have a rather large CTFE-generated TypeTuple in one of my
structs in my project, and I can seemingly replace it with a
Tuple with absolutely zero differences... except I compile
about 60-70% slower.
The tuple page is even confusing me
http://dlang.org/tuple.html
A variable declared with a TypeTuple becomes an
ExpressionTuple:
alias TL = Tuple!(int, long);
is it using Tuple!(T...) and TypeTuple!(T...) interchangeably?
Regular tuples are simply structs with a few methods like
opIndex. Ex. `Tuple!(A,B,C)` is mostly equivalent to `struct {
A _0; B _1; C _2; }`.
TypeTuples (whose name is IMO a misnomer) are special
compile-time-only objects whose values are passed in the
template parameters and can be types, aliases, or literal
values. They aren't first-class types, and shouldn't be used as
data storage, but they do have some unique properties that make
them useful for metaprogramming.
...
I'm using a typetuple for data storage, if I replace it with a
Tuple as I said in the OP, my program compiles 60-70% slower on
all three compilers. But it seems to be working just fine as is,
which is why I'm confused. I'm going to read Ali's links and
maybe get a better understanding here.
