openmethods

1 
2 import openmethods; // import lib
3 mixin(registerMethods); // mixin must be called after importing module
4 
5 interface  Animal {}
6 class Dog : Animal {}
7 class Pitbull : Dog {}
8 class Cat : Animal {}
9 class Dolphin : Animal {}
10 
11 // open method with single argument <=> virtual function "from outside"
12 string kick(virtual!Animal);
13 
14 @method // implement 'kick' for dogs
15 string _kick(Dog x) // note the underscore
16 {
17   return "bark";
18 }
19 
20 @method("kick") // use a different name for specialization
21 string notGoodIdea(Pitbull x)
22 {
23   return next!kick(x) ~ " and bite"; // aka call 'super'
24 }
25 
26 // multi-method
27 string meet(virtual!Animal, virtual!Animal);
28 
29 // 'meet' implementations
30 @method
31 string _meet(Animal, Animal)
32 {
33   return "ignore";
34 }
35 
36 @method
37 string _meet(Dog, Dog)
38 {
39   return "wag tail";
40 }
41 
42 @method
43 string _meet(Dog, Cat)
44 {
45   return "chase";
46 }
47 
48 void main()
49 {
50   import std.stdio;
51 
52   Animal hector = new Pitbull, snoopy = new Dog;
53   writeln("kick snoopy: ", kick(snoopy)); // bark
54   writeln("kick hector: ", kick(hector)); // bark and bite
55 
56   Animal felix = new Cat, flipper = new Dolphin;
57   writeln("hector meets felix: ", meet(hector, felix)); // chase
58   writeln("hector meets snoopy: ", meet(hector, snoopy)); // wag tail
59   writeln("hector meets flipper: ", meet(hector, flipper)); // ignore
60 }

Members

Aliases

MethodErrorHandler

alias MethodErrorHandler = void function(MethodError error)

Undocumented in source.

Classes

MethodError

class MethodError

Information passed to the error handler function.

Enums

hasVirtualParameters

eponymoustemplate hasVirtualParameters(alias F)

Undocumented in source.

Functions

defaultMethodErrorHandler

void defaultMethodErrorHandler(MethodError error)

Undocumented in source. Be warned that the author may not have intended to support it.

makeCallParams

auto makeCallParams(rf.Parameter[] parameters)

Undocumented in source. Be warned that the author may not have intended to support it.

next

auto ref next(T args)

Call the next most specialized override, if it exists. In other words, call the override that would have been called if this one had not been defined.

registerMethods

auto registerMethods(string moduleName)

Used as a string mixin: register the method declarations and definitions in the current module.

registrationMixture

string registrationMixture()

Undocumented in source. Be warned that the author may not have intended to support it.

removeStorageClasses

auto removeStorageClasses(rf.Parameter[] parameters)

Undocumented in source. Be warned that the author may not have intended to support it.

setMethodErrorHandler

MethodErrorHandler setMethodErrorHandler(MethodErrorHandler handler)

Set the error handling function to be called if an open method cannot be called with the provided arguments. The default is to abort the program.

trace

void trace(T args)

Undocumented in source. Be warned that the author may not have intended to support it.

tracef

void tracef(T args)

Undocumented in source. Be warned that the author may not have intended to support it.

tracefln

void tracefln(T args)

Undocumented in source. Be warned that the author may not have intended to support it.

updateMethods

Runtime.Metrics updateMethods()

Update the runtime dispatch tables. Must be called after dynamically loading or unloading a shared library.

Interfaces

Registrar

interface Registrar

Undocumented in source.

Manifest constants

MptrInDeallocator

enum MptrInDeallocator;

Undocumented in source.

MptrViaHash

enum MptrViaHash;

Undocumented in source.

Mixin templates

registerClasses

mixintemplate registerClasses(Classes...)

Undocumented in source.

registrar

mixintemplate registrar(alias MODULE, alias ModuleName)

Undocumented in source.

Structs

Method

struct Method(alias module_, string name, int index)

Undocumented in source.

MethodTag

struct MethodTag

Undocumented in source.

Runtime

struct Runtime

Undocumented in source.

covariant

struct covariant(T)

Mark a parameter as covariant.

method

struct method

Attribute: Add an override to a method.

mptr

struct mptr

Attribute: Set the policy for storing and retrieving the method pointer (mptr).

virtual

struct virtual(T)

Mark a parameter as virtual, and declare a method.

Variables

errorHandler

MethodErrorHandler errorHandler;

Undocumented in source.

• covariant_test
• moreanimals
• nextdemo
• openmethods
• udatest