Re: Is implicit string literal concatenation a good thing?

[Denis Koroskin]

On Mon, 23 Feb 2009 04:18:35 +0300, bearophile <bearophileh...@lycos.com> wrote:

BCS:

IIRC DMD doesn't always do the constant folding (Decent has a post processed

view that shows this in some cases) For instance, IIRC it only does left
most so this:
char[] foo = "foo";
char[] bar = foo ~ "bar" ~ "baz"

doesn't get folded. And even if DMD were to start doing that one, there is

no requirement that another compiler also do it.

If there are guarantees that "abc" "def" are folded at compile time, then the same guarantees can be specified for "abc" ~ "def". I can't see a problem.

I have also compiled this code with DMD:

void main() {
    string foo = "foo";
    string bar = foo ~ "bar" ~ "baz";
}

Won't work. Imaging foo is a user-defined type with custom opCat:

auto bar = foo  ~  "123" ~  "456";

compare to:

     std::cout << "123" << "456";