Example Void defmethod 011

 

 

Description

This example uses the {proc} argument to the defmethod function. The {proc} argument is coded inline using a lambda statement.

 

Details

Define the Add method:

(defmethod Void: Add(a b) ( writeln "Cannot Add to value:" a)) Returns: #<Dictionary 123456>

If the Void type is sent an Add message, an Lambda is invoked to output an error message. The reason is that the Void type, or #void constant cannot be used as an operand of a binary add. To invoke the Lambda that responds to the Add message, issue the following statement:

(send Add: X 1) Returns: Cannot Add to value:#void

Alternatively, the Lambda may be invoked using the following syntax:

(Add: X 1) Returns: Cannot Add to value:#void

Notes and Hints

To view the entry in the methods Dictionary created by the addMethod function, you can use the method name to access the directory entry by

#<Dictionary 123456>[methodName:] or

To determine the number of assigned methods:

(length (methodsOf Vector: ))

To access the nth method name:

(methodsOf Vector: )[n 0]

 

Related Examples

Here are examples of the defmethod function at work.

BitVector defmethod 020 Boolean defmethod 012 Character defmethod 013 Date defmethod 015
FltVector defmethod 017 Function defmethod 016 IntVector defmethod 018 List defmethod 022
NumVector defmethod 019 Number defmethod 014 ObjectRepository defmethod 023 Pair defmethod 021
ShortVector defmethod 019 Structure defmethod 004 Structure defmethod 005 Vector defmethod 008
Void defmethod 011

 

Function Links

Here is the link to the current function used in this example.

defmethod

Here are a number of links to other related functions.

addMethod(Void) send(Void) methodsOf(Void)

 

Argument Types

Here are the links to the data types of the arguments used in this example.

Void Symbol Dictionary

Here are a number of links to examples having similar argument types.

BitVector addMethod 023 BitVector defmethod 020 BitVector methodsOf 021 BitVector send 018
Boolean addMethod 011 Boolean addMethod 012 Boolean defmethod 012 Boolean methodsOf 012
Boolean send 010 Brick addMethod 008 Brick defmethod 025 Brick methodsOf 024
Brick send 027 ByteVector isCharAlphabetic 003 ByteVector isCharAlphanumeric 003 ByteVector isCharLowercase 003
ByteVector isCharName 003 ByteVector isCharNumeric 003 ByteVector isCharUppercase 003 ByteVector isCharWhitespace 003
Character addMethod 013 Character defmethod 013 Character methodsOf 013 Character send 011
Context debug 001 Context getGlobalValue 001 Context getSymbolTable 001 Context globalBinding 001
CpxVector addMethod 028 CpxVector send 028 Date addMethod 015 Date addMethod 016
Date defmethod 015 Date isDate 001 Date methodsOf 015 Date send 013
Dictionary addMethod 005 Dictionary binarySearch 002 Dictionary cdr 003 Dictionary compare 004
Dictionary compareEQ 004 Dictionary compareGE 004 Dictionary compareGT 004 Dictionary compareLE 004
Dictionary compareLT 004 Dictionary compareNE 004 Dictionary comparison functions 004 Dictionary copy 002
Dictionary count 002 Dictionary defMethod 006 Dictionary delete 003 Dictionary delete 004
Dictionary insert 002 Dictionary inside 002 Dictionary isAtom 002 Dictionary isBound 002
Dictionary isDictionary 001 Dictionary isEqual 002 Dictionary isIdentical 002 Dictionary isInside 002
Dictionary isMember 002 Dictionary isObject 004 Dictionary isType 006 Dictionary length 005
Dictionary makeDictionary 001 Dictionary map 002 Dictionary mapc 002 Dictionary member 002
Dictionary methodsOf 007 Dictionary new 004 Dictionary objectToDictionary 001 Dictionary objectToDictionary 002
Dictionary objectToDictionary 003 Dictionary objectToDictionary 004 Dictionary ref 007 Dictionary ref 008
Dictionary ref 009 Dictionary refAttributes 002 Dictionary refValues 002 Dictionary remove 002
Dictionary resize 002 Dictionary send 004 Dictionary setAttributes 002 Dictionary setCdr 001
Dictionary setCdr 002 Dictionary setq 007 Dictionary setq 008 Dictionary setq 009
Dictionary sizeof 004 Dictionary sort 003 Dictionary sort 004 Dictionary sort 005
Dictionary type 007 Directory addMethod 006 Directory defMethod 007 Directory delete 006
Directory insert 003 Directory inside 003 Directory isBound 003 Directory isDirectory 001
Directory isInside 003 Directory isMember 003 Directory member 002 Directory methodsOf 008
Directory new 005 Directory new 006 Directory ref 010 Directory ref 011
Directory ref 012 Directory refAttributes 003 Directory refValues 003 Directory remove 003
Directory send 005 Directory setAttributes 003 Directory setq 010 Directory setq 011
Directory sort 008 Directory sort 009 Error isIdentical 007 FltVector addMethod 019
FltVector defmethod 017 FltVector delete 009 FltVector insert 005 FltVector methodsOf 017
FltVector send 015 Function addMethod 017 Function addMethod 018 Function defmethod 016
Function methodsOf 016 Function send 014 IntVector addMethod 020 IntVector defmethod 018
IntVector delete 010 IntVector insert 006 IntVector methodsOf 018 IntVector send 016
List addMethod 025 List defmethod 022 List methodsOf 022 List send 020
Matrix addMethod 008 Matrix defMethod 009 Matrix delete 009 Matrix insert 005
Matrix methodsOf 010 Matrix send 008 NumMatrix addMethod 027 NumMatrix defmethod 024
NumMatrix delete 014 NumMatrix insert 009 NumMatrix methodsOf 024 NumMatrix send 027
NumVector addMethod 021 NumVector defmethod 019 NumVector delete 011 NumVector insert 007
NumVector methodsOf 019 NumVector send 017 Number addMethod 014 Number defmethod 014
Number methodsOf 014 Number send 012 ObjVector addMethod 022 ObjVector delete 012
ObjVector insert 008 ObjectRepository addMethod 026 ObjectRepository defmethod 023 ObjectRepository delete 013
ObjectRepository methodsOf 023 ObjectRepository send 026 Pair addMethod 024 Pair defmethod 021
Pair methodsOf 021 Pair send 019 PcodeVector methodsOf 020 ShortVector addMethod 021
ShortVector defmethod 019 ShortVector delete 011 ShortVector insert 007 ShortVector methodsOf 019
ShortVector send 017 String addMethod 001 String defMethod 001 String defMethod 002
String isChar 001 String isCharAlphabetic 001 String isCharAlphanumeric 001 String isCharLowercase 001
String isCharName 001 String isCharNumeric 001 String isCharUppercase 001 String isCharWhitespace 001
String isEqual 001 String isEqual 002 String isObject 001 String isString 001
String isText 001 String isType 001 String isType 002 String isType 003
String methodsOf 001 String methodsOf 002 String methodsOf 003 String parse 001
String send 001 String setq 001 String sizeof 001 String string 001
String string 002 String string 003 String type 001 Structure addMethod 003
Structure addMethod 004 Structure binaryInsert 001 Structure binarySearch 001 Structure defmethod 004
Structure defmethod 005 Structure delete 001 Structure delete 002 Structure insert 001
Structure inside 001 Structure isBound 001 Structure isInside 001 Structure isMember 001
Structure member 001 Structure methodsOf 005 Structure new 003 Structure ref 004
Structure ref 006 Structure refAttributes 001 Structure refValues 001 Structure remove 001
Structure send 003 Structure setAttributes 001 Structure setq 003 Structure setq 004
Structure setq 005 Structure setq 006 Structure uniqueInsert 001 Structure uniqueInsert 002
Symbol *< 001 Symbol ++ 001 Symbol +< 001 Symbol -- 001
Symbol -< 001 Symbol /< 001 Symbol addMethod 002 Symbol append 003
Symbol compare 002 Symbol compareEQ 002 Symbol compareGE 002 Symbol compareGT 002
Symbol compareLE 002 Symbol compareLT 002 Symbol compareNE 002 Symbol comparison functions 002
Symbol defMethod 003 Symbol downcase 002 Symbol getGlobalValue 001 Symbol getGlobalValue 002
Symbol getSymbolTable 001 Symbol getSymbolTable 002 Symbol hashString 002 Symbol isCharAlphabetic 002
Symbol isCharAlphanumeric 002 Symbol isCharLowercase 002 Symbol isCharName 002 Symbol isCharNumeric 002
Symbol isCharUppercase 002 Symbol isCharWhitespace 002 Symbol isObject 002 Symbol isSymbol 001
Symbol isType 004 Symbol methodsOf 004 Symbol new 002 Symbol proplist 001
Symbol proprecord 001 Symbol putprop 001 Symbol ref 003 Symbol remProp 001
Symbol send 002 Symbol setq 001 Symbol setq 002 Symbol sizeof 002
Symbol symbol 001 Symbol symbol 002 Symbol type 002 Symbol upcase 004
Vector addMethod 007 Vector defmethod 008 Vector delete 007 Vector delete 008
Vector insert 004 Vector methodsOf 009 Vector send 006 Vector setAttributes 004
Vector setAttributes 005 Void addMethod 009 Void addMethod 010 Void compareGE 008
Void compareLE 008 Void compareLT 008 Void comparison functions 008 Void defmethod 010
Void defmethod 011 Void isEqual 006 Void isIdentical 006 Void isNull 001
Void isType 010 Void methodsOf 011 Void ref 017 Void send 009
Void setq 015 Void sizeof 008 Void type 011

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