C++11

Frequently

• Move semantics
• Special member functions for move semantics
• Rvalue reference
• Auto
• Lambda expressions
• decltype
• Nullptr
• Range-based for loops
• Strongly-typed enums
• Type aliases
• constexpr
• Default functions
• Deleted functions
• noexcept specifier
• Smart pointers
• std::move()
• std::forward
• std::to_string
• std::make_shared
• std::chrono
• std::array
• std::begin/end
• Unordered containers

  Moderate

• Initializer lists
• Ref-qualified member functions
• Forwarding references
• *Variadic templates
• Static assertions
• Attributes
• Delegating constructors
• User-defined literals
• Explicit virtual overrides
• Final specifier
• Converting constructors
• Explicit conversion functions
• Non-static data member initializers
• Type traits
• Tuples
• std::tie
• std::ref
• std::thread
• std::async

Rare

• Inline namespaces
• Right angle brackets
• Trailing return types
• char32_t and char16_t
• Raw string literals
• Memory model