mirror of
https://github.com/ldmud/ldmud
synced 2026-08-12 14:26:05 -04:00
fb691fa2ea
Add a new type 'lpctype' to contain a type object, describing a compile-time type, together with a decltype() operator and to_lpctype() and check_type() efuns.
48 lines
1.2 KiB
Text
48 lines
1.2 KiB
Text
CONCEPT
|
|
lpctypes
|
|
|
|
INTRODUCTION
|
|
An lpctype variable stores an LPC type like int or string*.
|
|
They are mainly used in the check_types() efun, but also for
|
|
introspection with functionlist() and variable_list().
|
|
|
|
DEFINITION
|
|
An lpctype literal can be created either by writing the type
|
|
in brackets or using the decltype(LPC) operator:
|
|
|
|
lpctype t1 = [int];
|
|
lpctype t2 = decltype(t1); /* t2 will be [lpctype] */
|
|
|
|
The type in brackets can be any type declaration, similar to
|
|
the type declarations of variable or function result.
|
|
|
|
OPERATIONS
|
|
lpctypes support the following operations:
|
|
|
|
t1 | t2
|
|
|
|
Create a union type of both types.
|
|
|
|
t1 & t2
|
|
|
|
Create the intersection of both types. If the intersection
|
|
is empty [void] will be returned.
|
|
|
|
t1 in t2
|
|
|
|
Yields 1 if t1 is a subset of t2.
|
|
|
|
EXAMPLE
|
|
void process(mixed value)
|
|
{
|
|
if (check_type(value, [int|float]))
|
|
process_number(value);
|
|
else
|
|
process_anything(value);
|
|
}
|
|
|
|
HISTORY
|
|
The type was introduced in LDMud 3.6.7.
|
|
|
|
SEE ALSO
|
|
check_type(E), decltype(LPC)
|