6
增強智能指針can be used with polymorphism,但是如何將子類轉換回指針?如何在多態中使用boost :: smart_ptr?
using namespace boost;
// ...
shared_ptr<SuperClass> a_ptr(new SubClass);
// ...
shared_ptr<SubClass> b_ptr = (shared_ptr<SubClass>)a_ptr; // Doesn't compile
最後一行不編譯,並給出error C2440: 'type cast' : cannot convert from 'boost::shared_ptr
<T>
'到 '的boost :: shared_ptr的<T>
'
我認爲應該是'dynamic_p ointer_cast`在這種情況下,對吧? – Philipp 2011-01-21 22:43:17