aslike 0.4.0
Duck-typing with check interface
To use this package, run the following command in your project's root directory:
Manual usage
Put the following dependency into your project's dependences section:
ASLIKE
This lib can be helpful if you want to declare function or method what must get some object as argument, and it object must contains all methods what you want, and if you don't want use classic OOP and/or want use structs. If you use classic OOP and your functions and/or methods already gets interface as argument you can wrap structs to auto-implement objects.
API
struct Like(T) if (is(T == interface))
-- wrapper for T
, it have
methods and private delegate fields matches all methods from T
and method
for filling delegates from object
fillDelegatesFrom(bool nullCheck=true, X)(ref X src)
.
class LikeObj(T) : T
-- wrapper for T
, as Like!T
, but class.
class LikeObjCtx(T, S) : LikeObj!T
-- wrapper for T
, as LikeObj!T
,
but with S __context
field (usable for short lifetime structs).
Like!T as(T, bool nullCheck=true, X)(ref X obj) if (is(T == interface))
--
wrap object obj
into Like!T
if it possible (fill all delegate fields
in returned Like!T
with methods pointers from obj
). If X
is class or
interface and if nullCheck
is true enforce obj
is not null
.
T asObj(T, bool nullCheck=true, X)(ref X obj) if (is(T == interface))
--
wrap object obj
into LikeObj!T
if it possible.
T asObjCtx(T, bool nullCheck=true, X)(auto ref X obj) if (is(T == interface))
--
copy obj
into private field of LikeObjCtx!(T, X)
and wrap this field,
instead of original obj
.
T toObj(T)(auto ref const Like!T th) @property
-- make new wrapper object
(LikeObj!T
-- without saving th
) and fill delegates from th
delegates.
Examples
Overridable method with any compatible type: example
Cache virtual methods table lookup for improving multiple call methods performance: cache example
Use struct when method or function gets interface instance as argument: wrap to object example
BetterC
With -betterC
flag compatibles only struct Like
and function as
.
Like
objects emulates inheritance through alias this
, but only if interface
have exact one parent. See example
Notes
Like!T
struct and LikeObj!T
class have reference symantics respect to
wrapped object.
Be careful when wrap objects allocated on stack: when program exit from scope, reference to object saved in delegates will be broken.
- Registered by Oleg
- 0.4.0 released 4 years ago
- deviator/aslike
- MIT
- Authors:
- Dependencies:
- none
- Versions:
-
0.4.0 2020-Dec-12 0.3.0 2020-Aug-12 0.2.0 2020-Aug-12 0.1.1 2020-Jul-11 0.1.0 2020-Jul-11 - Download Stats:
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- Score:
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- Short URL:
- aslike.dub.pm