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Keywords totally new to C++11 (see here):

• alignas
• alignof
• char16_t
• char32_t
• constexpr
• decltype

Previous keywords that have had their meanings changed in C++11:

• class (adds declaration of scoped enumeration type)
• default (adds explicitly-defaulted function definition, “= default”)
• delete (adds support for deleted functions, “= delete”)
• export (unused and reserved since C++11)
• extern (now applies to thread storage duration)
• inline (now applies to inline namespaces]]
• mutable (now applies to lambda expressions)

Not new “keywords” but have special meaning in a particular context:

• final
• override