defriend

 

 

Overview

The defriend Macro creates a new Lambda object and assigns it to the specified persistent variable name {child} of the parent Lambda {parent}. The defriend Macro always returns the newly created Lambda object. Following the defriend Macro, the new Lambda will be invoked whenever the child member of the parent Lambda is referenced.

Usage

Use this macro when the parent Lambda and all its children are too large for one source file, or when you wish each friend Lambda to be defined in a separate source file from the parent.

 

Syntax

Expression:

(defriend parent:child(arg...) faces:(var...) pvars:(var...) cvars:(vars...) regs:(vars...) vars:(var...) exp...)

(defriend parent child(arg...) faces:(var...) pvars:(var...) cvars:(vars...) regs:(vars...) vars:(var...) exp...)

(defriend parent.mem child(arg...) faces:(var...) pvars:(var...) cvars:(vars...) regs:(vars...) vars:(var...) exp...)

Arguments Name Type Description
Argument:parent:Symbol The Parent Lambda that the child will be associated with.
Argument:child:Symbol The name of the new Lambda object (the Child Lambda).
Argument:(arg...)--- Optional Argument. Argument list for the Lambda.
Argument:faces:(var...)Symbol Optional Argument. If present, must be followed by a interfaces feature list.
Argument:vars:(var...)Symbol Optional Argument. If present, must be followed by a local variable list.
Argument:pvars:(var...)Symbol Optional Argument. If present, must be followed by a persistent variable list.
Argument:cvars:(var...)Symbol Optional Argument. If present, must be followed by a persistent class variable list.
Argument:regs:(var...)Symbol Optional Argument. If present, must be followed by a register variable list (up to fifty register variables are allowed).
Argument:exp...--- The Lisp statements that forms the Lambdas

Returns:

An Lambda that will be assigned the name {child}.

 

Examples

Here are a number of links to Lambda coding examples which contain this instruction in various use cases.

 

Argument Types

Here are the links to the data types of the function arguments.

Lambda Symbol

Here are also a number of links to functions having arguments with any of these data types.

++ += /= *=
-- -= addMethod append
apply argCount argFetch attachLibrarian
balance binaryInsert binarySearch boolean
callcc cdr character class
compareEQ compareGE compareGT compareLE
compareLT compareNE compare comparison
compile compress cons copy
count debugBrowsableProcs debug defchild
defclass define(macro) define defmacro
defmethod deforphan defriend defun
delete detachLibrarian dimension disassemble
display downcase encode evalInSyncLocalContext
eval exportCsv exportSbf exportTab
gc getGlobalValue getSymbolTable globalBinding
importCsv importSbf importTab insert
inside inspect integer isAtom
isBitVector isBoolean isByteVector isCharAlphabetic
isCharAlphanumeric isCharLowercase isCharName isCharNumeric
isCharUppercase isCharWhitespace isChar isCharacter
isClass isComplex isDate isDictionary
isDirectory isEqual isError isFloatVector
isIdentical isInside isIntegerVector isInteger
isLambda isMatrix isMember isMoney
isNumberMatrix isNumberVector isNumber isObjectVector
isObject isPair isPcodeVector isString
isStructure isSymbol isText isType
isVector lambda length lisp
list lock macroReplace makeLambda
makeQuotedList makeQuotedSymbol member methodsOf
money myself new number
offset onError openLog pair
parent parse pointer proplist
proprecord putprop qt refLibrarian
ref remProp remove rename
saveObject saveRepository send setCar
setCdr setLastCdr set setf
setq sizeof sql string
super svmRegression symbolToTypeCode symbol
type uniqueInsert unlock vectorFill
writelg writeln

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