Example Void defmethod 010

 

 

Description

This example defines a method named AddError that is invoked when the Void type receives an Add message. The AddError method simply displays an error message. The logic behind the error message is that the Void type, or the #void constant cannot be used as an operand in a binary add.

 

Details

Define the AddError method:

(defun AddError (a b) writeln "Error: Adding to Void is Invalid") Returns: #<Lambda 123456>

Install the AddError method and the message named Add in the Void Methods Dictionary .

(defmethod Void: Add(a b) (AddError a b)) Returns: #<Dictionary 123456>

To invoke the Lambda that responds to the Add message, issue the following statement:

(send Add: X 1) Returns: Error: Adding to Void is Invalid

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

(Add: X 1) Returns: Error: Adding to Void is Invalid

Notes and Hints

To view the entry in the methods Dictionary created by the defmethod 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 Void: ))

To access the nth method name:

(methodsOf Void: )[n 0]

 

Related Examples

Here are examples of the addMethod function at work.

BitVector addMethod 023 Boolean addMethod 011 Boolean addMethod 012 Boolean send 010
Brick addMethod 008 Brick send 027 Character addMethod 013 CpxVector addMethod 028
Date addMethod 015 Date addMethod 016 Dictionary addMethod 005 Directory addMethod 006
FltVector addMethod 019 Function addMethod 017 Function addMethod 018 IntVector addMethod 020
List addMethod 025 List send 020 Matrix addMethod 008 NumMatrix addMethod 027
NumMatrix defmethod 024 NumVector addMethod 021 Number addMethod 014 ObjVector addMethod 022
ObjectRepository addMethod 026 ObjectRepository send 026 Pair addMethod 024 ShortVector addMethod 021
String addMethod 001 Structure addMethod 003 Structure addMethod 004 Symbol addMethod 002
Vector addMethod 007 Void addMethod 009 Void addMethod 010 Void defmethod 010

 

Function Links

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

addMethod

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 Dictionary Symbol

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
Lambda compareLE 008 Lambda debug 001 Lambda define(macro) 001 Lambda defmacro 001
Lambda defmacro 002 Lambda exportTab 001 Lambda globalBinding 001 Lambda importTab 001
Lambda isLambda 001 Lambda send 008 Lambda send 009 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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