C++ 从基类到派生类的转换
2015-03-15 16:50
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Bulk_item bulk;
Item_base *itemP = &bulk; // ok: dynamic type is Bulk_item
Bulk_item *bulkP = itemP; // error: can't convert base to derived
In those cases when we know that the conversion from base to derived is safe, we can use a static_cast to override the compiler. Alternatively, we could request a conversion that
is checked at run time by using a dynamic_cast.
Item_base *itemP = &bulk; // ok: dynamic type is Bulk_item
Bulk_item *bulkP = itemP; // error: can't convert base to derived
In those cases when we know that the conversion from base to derived is safe, we can use a static_cast to override the compiler. Alternatively, we could request a conversion that
is checked at run time by using a dynamic_cast.
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