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Template std.functional.forward
Forwards function arguments with saving ref-ness.
Arguments
template forward(args...);
Example
class C
{
static int foo(int n) { return 1; }
static int foo(ref int n) { return 2; }
}
int bar()(auto ref int x) { return C.foo(forward!x); }
assert(bar(1) == 1);
int i;
assert(bar(i) == 2);
Example
void foo(int n, ref string s) { s = null; foreach (i; 0..n) s ~= "Hello"; }
// forwards all arguments which are bound to parameter tuple
void bar(Args...)(auto ref Args args) { return foo(forward!args); }
// forwards all arguments with swapping order
void baz(Args...)(auto ref Args args) { return foo(forward!args[$/2..$], forward!args[0..$/2]); }
string s;
bar(1, s);
assert(s == "Hello");
baz(s, 2);
assert(s == "HelloHello");