call

1.851.001.001.001.501.000.50

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Description

Description:

Adds given set of compiled instructions to the current stack and waits for it to finish and return, provides an option to pass arguments to the executed Code. See Scheduler to learn more about how the code is excuted and behaves.

Groups:

Program Flow

Syntax

Syntax:

call code

Parameters:

code: Code - Compiled instructions. In Operation Flashpoint this command also accepts datatype String

Return Value:

Anything - The last value given in the function is returned. See the topic Function for more information.

Alternative Syntax

Syntax:

args call code

Parameters:

args: Anything - Arguments that are passed to the function in the _this variable

code: Code - Compiled instructions. In Operation Flashpoint this command also accepts datatype String

Return Value:

Anything - The last value given in the function is returned. See the topic Function for more information.

Examples

Example 1:

call { hint str 123; };

Example 2:

123 call { hint str _this; };

Example 3:

_sum = [1, 2] call { (_this select 0) + (_this select 1); }; hint str _sum; // displays 3

Example 4:

123 call compile "hint str _this;";

Example 5:

_result = 123 call compile preprocessFileLineNumbers "myFile.sqf";

Additional Information

See also:

spawn execVM canSuspend compile compileScript preprocessFile remoteExec remoteExecCall

Notes

Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord or on the Forums.
Only post proven facts here! Add Note

Leopard20 - c

Posted on Nov 05, 2021 - 10:52 (UTC)

Contrary to a widespread misconception in the community, call doesn't necessarily execute the code in the Unscheduled Environment. Call simply means: "execute the code here", just like how you execute a code using then (if (true) then _code) or do. Therefore it does not change the environment:

call executed in environment:	Resulting environment of the code:
Scheduled	Scheduled
Unscheduled	Unscheduled

This means that doing something like this (which is misused very often):

private _handle = _params spawn MY_fnc_Function; waitUntil { scriptDone _handle };

is not needed, because a lot of performance would be wasted compared to simply doing this:

_params call MY_fnc_Function;

which does the exact same thing as the previous code, except no new "scheduler thread" is created and the function executes seamlessly, plus the added performance benefit as mentioned before.
If it is necessary to execute a code in the Unscheduled Environment, one can use isNil instead:

isNil {_params call MY_fnc_Function}; // MY_fnc_Function is always executed unscheduled, regardless of the current environment

or if there are no parameters, one can simply do this:

isNil MY_fnc_Function