Difference between revisions of "Macro Constants"
From GiderosMobile
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__NOTOC__ | __NOTOC__ | ||
| − | '''Supported platforms:''' android | + | <!-- GIDEROSOBJ:Macro Constants --> |
| + | '''Supported platforms:''' [[File:Platform android.png]][[File:Platform ios.png]][[File:Platform mac.png]][[File:Platform pc.png]]<br/> | ||
'''Available since:''' Gideros 2017.10<br/> | '''Available since:''' Gideros 2017.10<br/> | ||
| + | |||
=== Description === | === Description === | ||
| − | + | Another great Gideros feature is macros. Currently Lua has no constants, you just have to define variables like ''pi=3.14159''. | |
| − | |||
| − | Just use @ rather than = when defining the macro. | + | Now you can define symbolic constants like this ''pi @ 3.14159'' and then simply use ''pi'' in the code as normal. When the Lua code is byte compiled, the constants are replaced with their literal values which saves CPU time. |
| + | |||
| + | Macro Constants can be used for string and numeric constants. Just use @ rather than = when defining the macro. | ||
| + | |||
| + | You can use any of these delimiters after @ but they must be used in pairs. Numbers are auto-detected. | ||
| + | |||
| + | '''\`~ ! # $ % ^ & * / + = |''' | ||
| − | |||
| − | |||
=== Examples === | === Examples === | ||
| − | '''Simple examples''' | + | '''Simple examples''' |
| − | < | + | <syntaxhighlight lang="lua"> |
| − | pi@3.14159265358979324 | + | num1 @ &2^0& |
| − | + | num2 @ &2^1& | |
| − | + | num3 @ &num1 + num2& | |
| − | + | ||
| + | pi @ 3.14159265358979324 | ||
| + | num4 @ -100.54 | ||
| + | num5 @ 232 | ||
| + | num6 @ 444.10 | ||
str1 @ 'hello' | str1 @ 'hello' | ||
str2 @ "world" | str2 @ "world" | ||
| Line 22: | Line 31: | ||
Hello, | Hello, | ||
world! | world! | ||
| − | ]]</ | + | ]] |
| − | '''Commenting out the print command''' | + | </syntaxhighlight> |
| − | < | + | |
| + | '''Commenting out the print command''' | ||
| + | <syntaxhighlight lang="lua"> | ||
print @ |--| | print @ |--| | ||
| − | print(x, y, z, x + y, y * z) -- this line will be skipped</ | + | print(x, y, z, x + y, y * z) -- this line will be skipped |
| + | </syntaxhighlight> | ||
| + | |||
| + | '''Advanced example''' | ||
| + | <syntaxhighlight lang="lua"> | ||
| + | pi @ |math.atan(1.0)*4| | ||
| + | </syntaxhighlight> | ||
| + | |||
{|- | {|- | ||
| style="width: 50%; vertical-align:top;"| | | style="width: 50%; vertical-align:top;"| | ||
| Line 35: | Line 53: | ||
=== Constants === | === Constants === | ||
|} | |} | ||
| + | |||
| + | {{GIDEROS IMPORTANT LINKS}} | ||
Latest revision as of 15:31, 13 July 2023
Supported platforms: 
Available since: Gideros 2017.10
Description
Another great Gideros feature is macros. Currently Lua has no constants, you just have to define variables like pi=3.14159.
Now you can define symbolic constants like this pi @ 3.14159 and then simply use pi in the code as normal. When the Lua code is byte compiled, the constants are replaced with their literal values which saves CPU time.
Macro Constants can be used for string and numeric constants. Just use @ rather than = when defining the macro.
You can use any of these delimiters after @ but they must be used in pairs. Numbers are auto-detected.
\`~ ! # $ % ^ & * / + = |
Examples
Simple examples
num1 @ &2^0&
num2 @ &2^1&
num3 @ &num1 + num2&
pi @ 3.14159265358979324
num4 @ -100.54
num5 @ 232
num6 @ 444.10
str1 @ 'hello'
str2 @ "world"
str3 @ [[
Hello,
world!
]]
Commenting out the print command
print @ |--|
print(x, y, z, x + y, y * z) -- this line will be skipped
Advanced example
pi @ |math.atan(1.0)*4|
Methods |
EventsConstants |
