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Salil,
instead of your
#define WRITE45_EMA WriteIf ( LastValue(security) >
LastValue(security45ema), "Price is above it 45 ema","Price is not above 45
ema");
Write:
function WRITE45_EMA( security, sercurity45ema )
{
WriteIf ( LastValue(security) > LastValue(security45ema),
"Price is above it 45 ema","Price is not above 45 ema");
}
Then you can call it many times and save typing. Functions are
generally preferred over in-place macro expansion
because of lack of side effects that macros have. Therefore
they are way better for non-programmers.
Functions in AFL also provide much better performace than
macros would because they are parsed once.
Macro expansion just increases the length of the code that has
to be parsed and would slow down everything.
I have no intention to make AFL 100% the same as C/C++.
Although AFL has some similarities to C they are two different
beasts. First and most important is that
AFL is INTERPRETED while C is compiled. Due to this fact
#define would be simply ineffective.
Best regards,Tomasz Janeczkoamibroker.com
<BLOCKQUOTE
>
----- Original Message -----
<DIV
>From:
Salil V
Gangal
To: <A title=amibroker@xxxxxxxxxxxxxxx
href="">amibroker@xxxxxxxxxxxxxxx
Sent: Monday, May 19, 2003 5:51 AM
Subject: RE: [amibroker] #define
directive ?
Graham,
The #define directive allows one to write in short-hand rather than
writing long code. The compiler substiututes the short-hand into
its full form before executing it.
As an example, say if one is writing the following again and again
and again in the program ==>
WriteIf ( LastValue(security) > LastValue(security45ema),
"Price is above it 45 ema","Price is not above 45 ema");
Then one can just define the short-hand
#define WRITE45_EMA WriteIf ( LastValue(security) >
LastValue(security45ema), "Price is above it 45 ema","Price is not above
45 ema");
And the within the program then one needs to write just
WRITE45_EMA which will mean writing whole of 'WriteIf (
LastValue(security) > LastValue(security45ema), "Price is above it 45
ema","Price is not above 45 ema");' !
This comes in very handy when one has very large code. It cuts down
typing a lot. Languages like C, C++ support #define. Since AFL
already supports #include, which is similar to C, C++, I am wondering if there
is plan to add #define for AFL also ...
Regards,
- Salil V Gangal
Graham <gkavanagh@xxxxxxxxxxxxx>
wrote:
<BLOCKQUOTE
>
<SPAN
>What is #define represent
?
<SPAN
>
<FONT face="Times New Roman" color=teal
size=3><SPAN
>Cheers,<FONT
color=teal size=3><SPAN
>Graham
<FONT
face="Times New Roman" color=#339966 size=2><SPAN
><A
href=""><SPAN
>http://groups.msn.com/ASXShareTrading
<FONT
face="Times New Roman" color=#339966 size=2><SPAN
><A
href=""><SPAN
>http://groups.msn.com/FMSAustralia
<SPAN
>-----Original
Message-----From: Salil V
Gangal [mailto:salil_gangal@xxxxxxxxx] <SPAN
>Sent: Monday, 19 May 2003 9:40
AMTo:
amibroker@xxxxxxxxxxxxxxx<SPAN
>Subject: [amibroker] #define directive
?
<FONT face="Times New Roman"
size=2>
<FONT
face="Times New Roman" color=#ff4040 size=2><SPAN
>Tomasz,
<FONT face="Times New Roman"
size=2>
<FONT face="Times New Roman"
size=2>There is #include in AFL,
but AFAIK there is no #define in AFL.
<FONT face="Times New Roman"
size=2>
<FONT face="Times New Roman"
size=2>Are there any plans to add #define as
well ? With ever increasing length of AFL scripts, I'm sure that
#define will cut-down lot of typing while writing AFL
scripts.
<FONT face="Times New Roman"
size=2>
<FONT face="Times New Roman"
size=2>
<FONT
face="Times New Roman" color=#ff4040 size=2><SPAN
>Friends,
<FONT face="Times New Roman"
size=2>
<FONT face="Times New Roman"
size=2>Are there any work-arounds for #define
in AFL ?
<FONT face="Times New Roman"
size=2>
<FONT face="Times New Roman"
size=2>Regards,
<FONT face="Times New Roman"
size=2>- <FONT
face="Times New Roman" color=#4040ff><SPAN
>Salil V Gangal
<DIV class=MsoNormal
align=center><SPAN
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