Re: Passing Elements of A Static Array as Function Parameters
On Monday, 14 September 2015 at 09:09:27 UTC, Per Nordlöw wrote: Is there a reason why such a common thing isn't already in Phobos? If not what about adding it to std.typecons : asTuple I guess nobody's really needed that functionality before. It might be an interesting addition to std.array.
Re: Passing Elements of A Static Array as Function Parameters
On Monday, 14 September 2015 at 08:56:43 UTC, Per Nordlöw wrote: BTW: What about .tupleof? Isn't that what should be used here? I don't believe .tupleof works for arrays.
Re: Passing Elements of A Static Array as Function Parameters
On Monday, 14 September 2015 at 05:18:00 UTC, Nordlöw wrote:
If I have a static array `x` defined as
enum N = 3;
int[N] x;
how do I pass it's elements into a variadic function
f(T...)(T xs) if (T.length >= 3)
?
You could turn it into a Tuple and use the `expand` method to get
a TypeTuple (AliasSeq).
import std.typecons;
import std.typetuple;
import std.stdio;
template genTypeList(T, size_t n)
{
static if (n <= 1)
{
alias genTypeList = T;
}
else
{
alias genTypeList = TypeTuple!(T, genTypeList!(T, n - 1));
}
}
auto asTuple(T, size_t n)(ref T[n] arr)
{
return Tuple!(genTypeList!(T, n))(arr);
}
void test(T...)(T xs)
{
writeln("Length: ", T.length, ", Elements: ", xs);
}
void main()
{
int[5] a = [0, 1, 2, 3, 4];
test(a);//Length: 1, Elements: [0, 1, 2, 3,
4]
test(a.asTuple.expand); //Length: 5, Elements: 01234
}
Re: Passing Elements of A Static Array as Function Parameters
On Monday, 14 September 2015 at 07:05:23 UTC, Meta wrote:
You could turn it into a Tuple and use the `expand` method to
get a TypeTuple (AliasSeq).
import std.typecons;
import std.typetuple;
import std.stdio;
template genTypeList(T, size_t n)
{
static if (n <= 1)
{
alias genTypeList = T;
}
else
{
alias genTypeList = TypeTuple!(T, genTypeList!(T, n - 1));
}
}
auto asTuple(T, size_t n)(ref T[n] arr)
{
return Tuple!(genTypeList!(T, n))(arr);
}
void test(T...)(T xs)
{
writeln("Length: ", T.length, ", Elements: ", xs);
}
void main()
{
int[5] a = [0, 1, 2, 3, 4];
test(a);//Length: 1, Elements: [0, 1, 2,
3, 4]
test(a.asTuple.expand); //Length: 5, Elements: 01234
}
Is there a reason why such a common thing isn't already in
Phobos? If not what about adding it to std.typecons : asTuple
Re: Passing Elements of A Static Array as Function Parameters
On Monday, 14 September 2015 at 07:05:23 UTC, Meta wrote:
You could turn it into a Tuple and use the `expand` method to
get a TypeTuple (AliasSeq).
import std.typecons;
import std.typetuple;
import std.stdio;
template genTypeList(T, size_t n)
{
static if (n <= 1)
{
alias genTypeList = T;
}
else
{
alias genTypeList = TypeTuple!(T, genTypeList!(T, n - 1));
}
}
auto asTuple(T, size_t n)(ref T[n] arr)
{
return Tuple!(genTypeList!(T, n))(arr);
}
BTW: What about .tupleof? Isn't that what should be used here?
Passing Elements of A Static Array as Function Parameters
If I have a static array `x` defined as enum N = 3; int[N] x; how do I pass it's elements into a variadic function f(T...)(T xs) if (T.length >= 3) ?
