Re: How to create TypeTuple/ExpressionTuple from tuple/tuples

[Kenji Hara]

On Tuesday, 7 August 2012 at 16:11:05 UTC, Andrej Mitrovic wrote:

On 8/7/12, "Øivind" <oivind....@gmail.com> wrote:

How can I call this function with an already-constructed tuple
but pass the pule as an expressiontuple?

auto v = tuple(1, 2, 3);
f(v);

Use the .expand property:
f(v.expand)

You can also use slice operator instead of expand property.


import std.stdio, std.typecons;
void f(T ...)(T t) {
    writeln(t.length);
}

void main(){
    auto v = tuple(1, 2, 3);
    f(v[]); // prints 3

    auto v0 = tuple(1, 2, 3);
    auto v1 = tuple(4, 5, 6);
    f(v0[], v1[]);  // prints 6
}