On 2/1/16 5:20 PM, tsbockman wrote:
On Sunday, 31 January 2016 at 22:11:45 UTC, Steven Schveighoffer wrote:
Thanks! I was surprised this is not straightforward.
-Steve
For function return values, at least, you can do this:
import std.traits, std.stdio;
int foo()
{
return 0;
}
ref int bar()
{
static int x = 0;
return x;
}
enum isRetByRef(alias func) = (functionAttributes!func &
FunctionAttribute.ref_) != 0;
void main()
{
writeln("foo: ", isRetByRef!foo);
writeln("bar: ", isRetByRef!bar);
}
(DPaste: http://dpaste.dzfl.pl/2aa8d3553a12)
Thanks. In my case, I need to treat fields and properties that return by
ref the same way.
What I wanted essentially was a template constraint that says "this type
has a member named foo, and t.foo is an lvalue"
-Steve