Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All


Disables or restores the /RTC settings.

#pragma runtime_checks( "[runtime_checks]", {restore | off} )

You cannot enable a run-time check that was not enabled with a compiler option. For example, if you do not specify /RTCs, specifying #pragma runtime_checks( "s", restore) will not enable stack frame verification.

The runtime_checks pragma must appear outside a function and takes effect at the first function defined after the pragma is seen. The restore and off arguments turn options specified in the runtime_checks on or off.

The runtime_checks can be zero or more of the parameters shown in the following table.

Parameters of the runtime_checks Pragma


Type of run-time check


Enables stack (frame) verification.


Reports when a value is assigned to a smaller data type that results in a data loss.


Reports when a variable is used before it is defined.

These are the same letters used with the /RTC compiler option. For example:

#pragma runtime_checks( "sc", restore )

Using the runtime_checks pragma with the empty string ("") is a special form of the directive:

  • When you use the off parameter, it turns the run-time error checks, listed in the table above, off.

  • When you use the restore parameter, it resets the run-time error checks to those that you specified with the /RTC compiler option.

#pragma runtime_checks( "", off )
#pragma runtime_checks( "", restore ) 

Community Additions

© 2015 Microsoft