Overloading for lvalue and rvalue.

[Balagopal Komarath via Digitalmars-d-learn]

Is there a way to avoid the following combinatorial explosion of 
overloaded functions when overloading for lvalue and rvalue 
arguments? The following may be a bad example because int is 
cheap to copy. So assume a large datatype instead of int.

import std.stdio;

void foo(in ref int a, in ref int b)
{
     writeln("r, r");
}

void foo(in ref int a, in int b)
{
     writeln("r, i");
}

void foo(in int a, in ref int b)
{
     writeln("i, r");
}

void foo(in int a, in int b)
{
     writeln("i, i");
}

void main()
{
     int a, b;
     foo(a, b);
     foo(a, 0);
     foo(0, a);
     foo(0, 0);
}