Question

C++ considered (almost) super set of C; but still there are certain things which works in C and not in C++.

Is there any feature/facility which is a valid C++03 but not working in C++11 ?

Answer 1

Is there any feature/facility which is
a valid C++03 but not working in C++11
?

There are few incompabilities :

• export template is removed (not deprecated, really removed)
• you can’t use auto as storage specifier anymore
• there are new reserved words : alignof, char16_t, char32_t, constexpr, decltype, noexcept, nullptr, static_assert and thread_local

also, for future versions :

• std::auto_ptr is deprecated
• throw specifications are deprecated

Maybe I’m missing others, but if your code uses those, you’ll have to fix it.

Almost all C++2003 features still are the same or are more precisely specified for compiler implementations in C++2011.