For class types, a special operator is defined to return the
class object for method calls rather than the return value from
the call itself. The use of the operator places the return types
in special variables to be accessed easily. The operator is
simply a syntax helper and is along the lines of UFCS.
e.g.,
class myClass
{
Do(int x) { return x + 2; }
}
auto myObj = new myClass();
assert(@@myObj.Do(3).Do(4).Do(5) == 7);
Of course, such a silly example is not very helpful but
demonstrates the concept.
To make such a syntax work well, I believe one then needs a
further operator to access the last return value.
e.g.,
assert(@@myObj.Do(3).Do(@).Do(@2) == 9);
Where the same symbol is used for there return value placeholders
and indices are used to access nested calls return value with @
defaulting to @1.
Essentially such syntax allows for easily doing nested calls.
The only down side is that the operator could only be used on one
method call at a type in the nesting. (or multiple or
parameritized operators would be required)
Obviously @ would not be the symbol of choice.
