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26 lines
1.3 KiB
Markdown
26 lines
1.3 KiB
Markdown
The [$CHECKING]($CHECKING) metacommand turns C++ event checking ON or OFF.
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## Syntax
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> [$CHECKING]($CHECKING):{ON|OFF}
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## Description
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* The Metacommand does **not** require a comment or REM before it. There is no space after the colon.
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* The OFF action turns event checking off and should **only be used when running stable, errorless code.**
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* The default [$CHECKING]($CHECKING):ON action is only required when checking has been turned OFF previously.
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* When [$CHECKING]($CHECKING):OFF is used, all error code and the reporting code is removed from the EXE program.
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* **Warning: Turning OFF error checking could create a General Protection Fault (or segfault). Use only with 100% stable sections of code.**
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### Details
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* After every QB64 command is translated to C++, the compiler adds special code sections to check for [ON TIMER (n)](ON-TIMER-(n)) events and errors that may have occured in the last function call. Disabling error checking with the [$CHECKING]($CHECKING):OFF directive prevents the compiler from adding the extra code sections.
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* Setting [$CHECKING]($CHECKING):OFF is only designed for 100% stable, errorless sections of code, where every CPU cycle saved counts, such as in a software 3D texture mapper, for example.
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## See Also
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* [ON TIMER(n)](ON-TIMER(n))
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* [ON ERROR](ON-ERROR)
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* [Metacommand](Metacommand)
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* [ERROR Codes](ERROR-Codes)
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