This is great. It's funny I was thinking the same this morning before
having looked over this message.
As expansion using $xxx is called interpolation in Perl and probably
other scripting languages I suggest we call the facility "inter".
We can use it with writeln, which I think will be quite popular:
int a = 2;
string b = "hello";
writeln(mixin(inter!"I told you $a times: $str!"));
As shown above, I also suggest that we don't require {} when the
expression is an identifier.
A debatable language change would allow us to eliminate "mixin", as it
has been discussed in the newsgroup. A simpler and less dangerous change
would be to make the paren optional:
writeln(mixin inter!"I told you $a times: $str!");
Andrei
On 10/31/10 10:50 AM, kenji hara wrote:
I wrote a trivial utility template for generating code string.
This provides some easiness and viewability of metaprogramming.
(This is currently used in my adaptTo.)
http://github.com/9rnsr/scrap/blob/master/expand/expand.d
Sample:
----
template GenFunc(string name)
{
mixin(
mixin(expand!q{
int ${name}(){ return 10; }
}));
// result of expand! is:
// q{`int ` ~ name ~ `(){ return 10; }`}
}
mixin GenFunc!("test"); // generates function "test" returns int
unittest{
assert(test() == 10);
}
----
expand!q{ codes... } parses D code string, and expands ${ expr } for
embedding expr that is expression evaluated as string in compile-time.
do you think?
Kenji
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