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/GR (Enable Run-Time Type Information)


This option (/GR) adds code to check object types at run time. When this option is specified, the compiler defines the _CPPRTTI preprocessor macro. The option is cleared (/GR–) by default.

For more information on run-time type checking, see Run-Time Type Information in the C++ Language Reference.

To set this compiler option in the Visual Studio development environment

  1. Open the project's Property Pages dialog box. For details, see Setting Visual C++ Project Properties.
  2. Click the C/C++ folder.
  3. Click the Language property page.
  4. Modify the Enable Run-Time Type Info property.

To set this compiler option programmatically

See RuntimeTypeInfo Property.

See Also

Compiler Options | Setting Compiler Options