c++ style casting At the beginning c++ supported two styles of casts:

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Presentation transcript:

c++ style casting At the beginning c++ supported two styles of casts: (typename)expression typename(expression) Instead there are now four new casting operators: static_cast<type>(expression) const_cast<type>(expression) reinterpret_cast<type>(expression) dynamic_cast<type>(expression)

The 'static_cast operator static_cast<type>(expression) Works where implicit conversion exists standard or user-defined conversion up-casts Safer that “old-style” casts e.g. won’t cast int* to float* Failure causes a compiler error No dynamic checking is done! int i = static_cast<int>(12.45);

The ‘const_cast'operator const_cast<type>(expression) Is used to remove (or add) const-ness: void g(C * cp); void f(C const* cp) { g(const_cast<C *>(cp)); } Usually, you should design your variables/methods such that you won’t have to use const_cast. Failure causes compiler errors

‘reinterpret_cast'operator reinterpret_cast<type>(expression) Is used to reinterpret byte patterns. double d(10.2); char* dBytes = reinterpret_cast<char *>(&d); Circumvents the type checking of c++. Very implementation-dependent. Rarely used. Very dangerous !