RTTI | NORTTI (C++ only)

Pragma equivalent

None.

Purpose

Generates runtime type identification (RTTI) information for exception handling and for use by the typeid and dynamic_cast operators.

Syntax


   .-NORTTI-.                              
>>-+-RTTI---+--+-----------------------+-----------------------><
               '-(--+-ALL---------+--)-'   
                    '-DYNAMICCAST-'

Defaults

NORTTI

Parameters

ALL: The compiler generates the information needed for the RTTI typeid and dynamic_cast operators. If you specify just RTTI, this is the default suboption.
DYNAMICCAST: The compiler generates the information needed for the RTTI dynamic_cast operator, but the information needed for typeid operator is not generated.

Usage

For improved runtime performance, suppress RTTI information generation with the NORTTI setting.

Notes:

The string output from RTTI function std::typeinfo::name() is always in EBCDIC code page.
Even though the default is NORTTI, if you specify LANGLVL(EXTENDED) or LANGLVL(ANSI), you will also implicitly select RTTI.

IPA effects

The IPA link step does not accept the RTTI option. The compiler issues a warning message if you specify this option in the IPA link step.

Predefined macros

__RTTI_DYNAMIC_CAST__ is predefined to a value of 1 when the RTTI, RTTI(ALL), or RTTI(DYNAMICCAST) compiler options are in effect; otherwise, it is not defined.
__RTTI_ALL__ is predefined to a value of 1 when the RTTI or RTTI(ALL) compiler options are in effect; otherwise, it is not defined.
__NO_RTTI__ is predefined to a value of 1 when the NORTTI compiler option is in effect; otherwise, it is not defined.

Related information

For more information about the LANGLVL(EXTENDED) compiler option, see LANGLVL.