Non-inline function as argument

3 Message(s) by 2 Author(s) originally posted in javascript

From: bodorange

Date: Thursday, November 23, 2006

I'm not sure if this is a JAVAscript question or more google maps API

<programming> (API, or "application programming interface")
	The interface (calling conventions) by which an {application
	program} accesses {operating system} and other services.  An
	API is defined at {source code} level and provides a level of
	{abstraction} between the application and the {kernel} (or
	other privileged utilities) to ensure the {portability} of the
	code.

	An API can also provide an interface between a {high level
	language} and lower level utilities and services which were
	written without consideration for the {calling conventions}
	supported by compiled languages.  In this case, the API's main
	task may be the translation of parameter lists from one format
	to another and the interpretation of {call-by-value} and
	{call-by-reference} arguments in one or both directions.

	(1995-02-15)

(application programming

1. The art of debugging a blank sheet of paper (or, in these
	days of on-line editing, the art of debugging an empty file).

	2. A pastime similar to banging one's head against a wall, but
	with fewer opportunities for reward.

	3. The most fun you can have with your clothes on (although
	clothes are not mandatory).

	[{Jargon File}]

	(2003-02-12)

interface)
specific. I'm new to both JAVAscript and Google

<World-Wide Web> The {World-Wide Web} {search engine} that
	indexes the greatest number of web pages - over two billion by
	December 2001 and provides a free service that searches this
	index in less than a second.

	The site's name is apparently derived from "{googol}", but
	note the difference in spelling.

	The "Google" spelling is also used in "The Hitchhikers Guide
	to the Galaxy" by Douglas Adams, in which one of Deep
	Thought's designers asks, "And are you not," said Fook,
	leaning anxiously foward, "a greater analyst than the
	Googleplex Star Thinker in the Seventh Galaxy of Light and
	Ingenuity which can calculate the trajectory of every single
	dust particle throughout a five-week Dangrabad Beta sand
	blizzard?"

	{Home (http://www.google.com/)}.

	(2001-12-28)

maps and find the code

<software> Instructions for a computer in some programming
	language, often {machine language}.  The word "code" is often
	used to distinguish instructions from {data} (e.g. "The code
	is marked 'read-only'") whereas "{software}" is used in
	contrast with "{hardware}" and may consist of more than just
	code.

	(2000-04-08)

less
readable if I use inline

<programming> (Or "unfold") To replace a {function} call with
	an instance of the function's body.  {Actual argument}
	expressions are substituted for {formal parameters} as in
	{beta reduction}.  Inlining is usually done as a
	{compile-time} transformation.

	If done recklessly (e.g. attempting to inline a {recursive}
	function) the {compiler} will fail to terminate.  If done
	over-enthusiastically the code size may increase
	exponentially, e.g. if function f calls g twice, and g calls h
	twice and h is inlined in g which is inlined in f (in either
	order) then there will be four copies of h's body in f.

	See also {linear argument}, {unfold/fold}.

	(1994-11-03)

function

1. <mathematics> (Or "map", "mapping") If D and C are sets
	(the domain and codomain) then a function f from D to C,
	normally written "f : D -> C" is a subset of D x C such that:

	1. For each d in D there exists some c in C such that (d,c) is
	an element of f.  I.e. the function is defined for every
	element of D.

	2. For each d in D, c1 and c2 in C, if both (d,c1) and (d,c2)
	are elements of f then c1 = c2.  I.e. the function is uniquely
	defined for every element of D.

	See also {image}, {inverse}, {partial function}.

	2. <programming> Computing usage derives from the mathematical
	term but is much less strict.  In programming (except in
	{functional programming}), a function may return different
	values each time it is called with the same argument values
	and may have {side effects}.

	A {procedure} is a function which returns no value but has
	only {side-effects}.  The {C} language, for example, has no
	procedures, only functions.  {ANSI C} even defines a {type},
	{void}, for the result of a function that has no result.

	(1996-09-01)

s. How do I use GEvent.addListener() with
say a reference

1. <programming> An {address}, from the point of view of a
	programming language.  A pointer may be typed, with its {type}
	indicating the type of data to which it points.

	The terms "pointer" and "reference" are generally
	interchangable although particular programming languages often
	differentiate these two in subtle ways.  For example, {Perl}
	always calls them references, never pointers.  Conversely, in
	C, "pointer" is used, although "a reference" is often used to
	denote the concept that a pointer implements.

	{Anthony Hoare} once said:

	Pointers are like jumps, leading wildly from one part of the
	data structure to another.  Their introduction into high-level
	languages has been a step backward from which we may never
	recover.

	[C.A.R.Hoare "Hints on Programming Language Design", 1973,
	Prentice-Hall collection of essays and papers by Tony Hoare].

	2. <operating system> (Or "mouse pointer") An {icon}, usually
	a small arrow, that moves on the screen in response to
	movement of a {pointing device}, typically a {mouse}.  The
	pointer shows the user which object on the screen will be
	selected etc. when a mouse button is clicked.

	(1999-07-07)

to a function (or similar) as an argument

<programming> (Or "arg") A value or reference passed to a
	{function}, {procedure}, {subroutine}, command or program, by
	the caller.  For example, in the function definition

		square(x) = x * x

	x is the {formal argument} or "parameter", and in the call

		y = square(3+4)

	3+4 is the {actual argument}.  This will execute the function
	square with x having the value 7 and return the result 49.

	There are many different conventions for passing arguments to
	functions and procedures including {call-by-value},
	{call-by-name}, {call-by-reference}, {call-by-need}.  These
	affect whether the value of the argument is computed by the
	caller or the callee (the function) and whether the callee can
	modify the value of the argument as seen by the caller (if it
	is a variable).

	Arguments to functions are usually, following mathematical
	notation, written in parentheses after the function name,
	separated by commas (but see {curried function}).  Arguments
	to a program are usually given after the command name,
	separated by spaces, e.g.:

		cat myfile yourfile hisfile

	Here "cat" is the command and "myfile", "yourfile", and
	"hisfile" are the arguments.

	(2006-05-27)

rather than an
inline function as the argument? How can I call something like

GEvent.addListener(map, 'click

<hardware> To press and release a {button} on a {mouse} or
	other {pointing device}.  This generates an {event}, also
	specifying the screen position, which is processed by the
	{window manager} or {application program}.  On a mouse with
	more than one button, the unqualified term usually implies
	pressing the left-most button (with the right index finger),
	other buttons would be qualified, e.g. "{right-click}".
	{Keyboard} modifiers may also be used, e.g. "shift-click",
	meaning to hold down the shift key on the keyboard while
	clicking the mouse button.

	If the mouse moves while the button is pressed then this is a
	{drag}.

	(1995-03-14)

', map_click(point));

function map_click(aPoint){
.
.
}

Thanks for any help.

From: David Golightly

Date: Sunday, November 26, 2006

wrote in message:

I'm not sure if this is a JAVAscript question or more google maps API (application programming interface)
specific. I'm new to both JAVAscript and Google maps and find the code less
readable if I use inline functions. How do I use GEvent.addListener() with
say a reference to a function (or similar) as an argument rather than an
inline function as the argument? How can I call something like
GEvent.addListener(map, 'click', map_click(point));
function map_click(aPoint){
.
.
}
Thanks for any help.

That's easy:

function map_click(aPoint) {
// do something
}

GEvent.addListener(map, 'click', map_click); // just use the fn name,
no parens

is for your purposes the same as

GEvent.addListener(map, 'click', function(aPoint) {
// do something
});

Note that you must pass the function as a reference, that is, without
the parens. The click event

1. <software> An occurrence or happening of significance to a
	task or program, such as the completion of an asynchronous
	input/output operation.  A task may wait for an event or any
	of a set of events or it may (request to) receive asynchronous
	notification (a {signal} or {interrupt}) that the event has
	occurred.

	See also {event-driven}.

	2. <data> A transaction or other activity that affects the
	records in a file.

	(2000-02-09)

will call this function, passing in
arguments as necessary.

-David

From: bodorange

Date: Sunday, November 26, 2006

wrote in message:

wrote in message:
I'm not sure if this is a JAVAscript question or more google maps API (application programming interface)
specific. I'm new to both JAVAscript and Google maps and find the code less
readable if I use inline functions. How do I use GEvent.addListener() with
say a reference to a function (or similar) as an argument rather than an
inline function as the argument? How can I call something like

GEvent.addListener(map, 'click', map_click(point));

function map_click(aPoint){
.
.
}

Thanks for any help.
That's easy:
function map_click(aPoint) {
// do something
}
GEvent.addListener(map, 'click', map_click); // just use the fn name,
no parens
is for your purposes the same as
GEvent.addListener(map, 'click', function(aPoint) {
// do something
});
Note that you must pass the function as a reference, that is, without
the parens. The click event will call this function, passing in
arguments as necessary.
-DavidMany thanks for the help.
Cheers.

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