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Aminet 45
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Aminet 45 (2001)(GTI - Schatztruhe)[!][Oct 2001].iso
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call_other
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SYNOPSIS
unknown call_other(object ob, string fun, mixed arg, ...)
unknown call_other(object *ob, string fun, mixed arg, ...)
ob->fun (mixed arg, ...)
ob->"fun" (mixed arg, ...)
ob->(fun) (mixed arg, ...)
DESCRIPTION
Call a member function <fun> in another object <ob> with an
the argument(s) <arg...>. Result is the value returned from
the called function (or 0 for non-existing or void functions).
If <ob> is given as an array of objects, the function is called
with the same arguments in all the given objects. The single
results are collected in an array and yield the final result.
Array elements can be objects or the names of existing objects;
destructed objects and 0s will yield a '0' as result, but don't
cause an error.
The object(s) can be given directly or via a string (i.e. its
object_name). If it is given by a string and the object does not
exist yet, it will be loaded.
ob->fun(args) and "ob_name"->fun(args) is equivalent to
call_other(ob, "fun", args). Nowadays the ob_name string can
also be a variable.
ob->fun(args) and ob->"fun"(args) are equivalent to
call_other(ob, "fun", args). ob->(fun)(args) are equivalent
to call_other(ob, fun, args) where fun is a runtime expression
returning the function name.
If ob does not define a publicly accessible function of the
specified name, call_other() will return 0, which is
indistinguishable from a function returning 0. "publicly
accessible" means "public" when calling other objects, and
"public" or "static" when calling this_object(). "private"
and "protected" function can never be called with call_other().
The return type of call_other() is 'any' be default. However,
if your LPC code uses #pragma strict_types, the return type is
'unknown', and the result of call_other() must be casted to
the appropriate type before you can use it for anything.
EXAMPLES
// All the following statements call the lfun QueryProp()
// in the current player with the argument P_SHORT.
string str, fun;
str = (string)call_other(this_player(), "QueryProp", P_SHORT);
fun = "QueryProp";
str = (string)call_other(this_player(), fun, P_SHORT);
str = (string)this_player()->QueryProp(P_SHORT);
str = (string)this_player()->"QueryProp"(P_SHORT);
fun = "QueryProp";
str = (string)this_player()->(fun)(P_SHORT);
You have to do explicit type casting because of the unknown
return type, if you have set #pragma strict_types.
// This statement calls the lfun short() in all interactive users
// and stores the collected results in a variable.
string * s;
s = (string *)users()->short();
!Compat: call_other("/users/luser/thing", "???", 0);
Compat: call_other("users/luser/thing", "???", 0);
This looks a bit weird but it was used very often to just load
the object by calling a not existing function like "???".
Fortunately nowadays there is an efun load_object() for this
purpose.
HISTORY
In LDMud 3.2.8 the following improvements were made:
- the forms x->"y"() and x->(y)() are recognized;
- the form x->y() no longer clashes with a local variable also
called "y";
- a simul_efun call_other() also catches ->() calls.
- call_other can be applied on arrays of objects.
SEE ALSO
function_exists(E), call_resolved(E), create(A), pragma(LPC),
extern_call(E), functions(LPC)