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12 lines
727 B
Text
12 lines
727 B
Text
Finally there is a new style cast that is used in combination with
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polymorphism (see chapter ref(POLYMORPHISM)). Its syntax is:
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verb( dynamic_cast<type>(expression))
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Different from the tt(static_cast), whose actions are completely determined
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em(compile-time), the tt(dynamic_cast)'s actions are determined em(run-time) to
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convert a pointer to an object of some class (e.g., tt(Base)) to a pointer to
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an object of another class (e.g., tt(Derived)) which is found further down its
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so-called em(class hierarchy) (this is also called em(downcasting)).
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At this point in the em(Annotations) a tt(dynamic_cast) cannot yet be
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discussed extensively, but we return to this topic in section
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ref(DYNAMICCAST).
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