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The Enable Run-Time Type Information option (/GR) causes the compiler to add 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.
To find this option in the development environment, click Settings on the Project menu. Then click the C/C++ tab, and click C++ Language in the Category box.
For more information on run-time type checking, see Run-Time Type Information in the C++ Language Reference.