Re: static foreach direct use of variables
On Tuesday, 1 January 2019 at 21:34:08 UTC, Paul Backus wrote:
On Tuesday, 1 January 2019 at 21:14:09 UTC, Michelle Long wrote:
auto foo(S s)
{
static foreach(k, p; [s, this])
for(int i = 0; i < p.length; i++)
...
}
The idea is to provide single for loop structure for each of
the variables(in this case s and this).
You can do this with `std.meta.AliasSeq`:
string[] a = ["lions", "tigers", "bears"];
int[] b = [123, 456, 789];
static foreach(array; AliasSeq!(a, b)) {
foreach (item; array) {
writeln(item);
}
}
I tried that but it didn't work... I will try again.
Re: static foreach direct use of variables
On Tuesday, 1 January 2019 at 21:14:09 UTC, Michelle Long wrote:
auto foo(S s)
{
static foreach(k, p; [s, this])
for(int i = 0; i < p.length; i++)
...
}
The idea is to provide single for loop structure for each of
the variables(in this case s and this).
You can do this with `std.meta.AliasSeq`:
string[] a = ["lions", "tigers", "bears"];
int[] b = [123, 456, 789];
static foreach(array; AliasSeq!(a, b)) {
foreach (item; array) {
writeln(item);
}
}
Re: static foreach direct use of variables
On Tuesday, 1 January 2019 at 21:14:09 UTC, Michelle Long wrote:
auto foo(S s)
{
static foreach(k, p; [s, this])
for(int i = 0; i < p.length; i++)
...
}
try
static foreach(...) {{
stuff
}}
The double {{ and double }} are intentional.
static foreach direct use of variables
auto foo(S s)
{
static foreach(k, p; [s, this])
for(int i = 0; i < p.length; i++)
...
}
The idea is to provide single for loop structure for each of the
variables(in this case s and this).
The is to avoid string mixins which are pathetic for this kind of
work.
The point is that instead of having to do
for(int i = 0; i < s.length; i++)
...
for(int i = 0; i < this.length; i++)
...
in which case ... might be very long.
Sure one can create a function and all that mess but the compiler
should be able to do symbol replacement very naturally and easily.
