what about

void fun(ref int);
fun(1.lvalueof);

previous work : https://wiki.dlang.org/DIP39

The lvalueof property could create a temporary variable if the exp it's used on is not already a lvalue, otherwise it would do nothing.

On Monday, 9 May 2022 at 14:03:21 UTC, Basile B. wrote:

That's what happens if you supply the -preview=rvaluerefparam compiler argument, right? Then this already works:

void fun(ref int i) {}

void main()
{
    fun(1);
}

There is also -preview=in.

So what is the advantage of having to add .lvalueof?

-- Bastiaan.

On Thursday, 12 May 2022 at 08:06:14 UTC, Bastiaan Veelo wrote:

void fun(ref int i) {}

void main()
{
    fun(1);
}

Ok, I was not aware of that. It's would be indeed useless if D can already do that implictly.