12.5. Dynamic RTTI type casts

The DYNAMIC_CAST_RTTI module implements runtime dynamic casting between class types using RTTI information. It provides safe downcasting with null results on type mismatch, similar to C++ dynamic_cast.

All functions and symbols are in “dynamic_cast_rtti” module, use require to get access to it.

require daslib/dynamic_cast_rtti

12.5.1. Variant macros

dynamic_cast_rtti.ClassAsIs

Variant macro that implements class dynamic casting via is and as.

12.5.2. Dynamic casts

• dynamic_type_cast (instance: auto; otherclass: auto(TT)) : TT?

• force_dynamic_type_cast (instance: auto; otherclass: auto(TT)) : TT?

• is_instance_of (instance: auto(TCLS)?; otherclass: auto(TT)) : auto

dynamic_cast_rtti.dynamic_type_cast(instance: auto; otherclass: auto(TT)): TT?

Casts a class instance to the target type using RTTI, returns null if the cast fails.

Arguments:

• instance : auto

• otherclass : auto(TT)

dynamic_cast_rtti.force_dynamic_type_cast(instance: auto; otherclass: auto(TT)): TT?

Casts a class instance to the target type using RTTI, panics if the cast fails.

Arguments:

• instance : auto

• otherclass : auto(TT)

dynamic_cast_rtti.is_instance_of(instance: auto(TCLS)?; otherclass: auto(TT)): auto

Returns true if the class instance is an instance of the specified class using RTTI.

Arguments:

• instance : auto(TCLS)?

• otherclass : auto(TT)