>
> I had a few questions about how some features of C++ translate to x10.
>
> First, are there features such as "const" or "typedef" in x10. As
> far as I understand they exist in C++ to aid efficiency by allowing
> the preprocessor to do certain types of inlining. Does the x10
> compiler infer these things automatically or are there keywords I
> can use for the sake of such efficiency. Also, how does inlining a
> function work in x10?
>
> There is a typedef in X10 -- see Sec 4.4 in http://
> x10.sourceforge.net/documentation/languagespec/x10-latest.pdf
>
> There is no support for C++ const.
In principle, X10's val modifier (similar to Java's final) indicates
approximately the same things as C++'s const. In practice, (because C++
constructors don't support the virtual method dispatch semantics that X10
requires) we can't actually make X10 val fields C++ const fields in the
generated C++ code, so it doesn't actually help the C++ compiler as much as
one would like :(.
>
> You can instruct the compiler to inline by marking methods as
> @Inline, after importing x10.compiler.Inline.
This does work, but should be used sparingly (and most likely not while
initially developing code).
> Secondly, I saw that there is a "vec" class in the standard
> libraries. Is this an x10 vector class or something else? If not,
> is there a standard x10 vector class or would I need to create one?
vec is a hack we'd like to get rid of soon. It's intended for
constant-size, stack allocated vectors to enable hand-unrolling of loops.
We expect to be able to replace it with stack-allocated Rails in 2.4 (less
of a hack).
> Finally, I wanted to know how I could figure these things out for
> myself in general. I am used to a language like Java where I can
> just google the term I am interested in and usually find something
> relevant. However, for x10 it is very hard to get useful results
> for google (for example googling "x10 vector class" gives me results
> about where I can but the Vector X10 bike"). I am able to find some
> of the basic stuff at x10-lang.org but I struggle to find answers to
> specific questions like these.
The generated x10doc for the standard library of the latest X10 release can
be found online at:
http://www.x10-lang.org/documentation/x10-standard-library.html. It's not
always complete, but it is a place to start to find out what classes are
available in the standard library.
--dave
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