[cstddef.syn]

// all freestanding namespace std { using ptrdiff_t = see below; using size_t = see below; using max_align_t = see below; using nullptr_t = decltype(nullptr); enum class byte : unsigned char {}; // [support.types.byteops], byte type operations template<class IntType> constexpr byte& operator<<=(byte& b, IntType shift) noexcept; template<class IntType> constexpr byte operator<<(byte b, IntType shift) noexcept; template<class IntType> constexpr byte& operator>>=(byte& b, IntType shift) noexcept; template<class IntType> constexpr byte operator>>(byte b, IntType shift) noexcept; constexpr byte& operator|=(byte& l, byte r) noexcept; constexpr byte operator|(byte l, byte r) noexcept; constexpr byte& operator&=(byte& l, byte r) noexcept; constexpr byte operator&(byte l, byte r) noexcept; constexpr byte& operator^=(byte& l, byte r) noexcept; constexpr byte operator^(byte l, byte r) noexcept; constexpr byte operator~(byte b) noexcept; template<class IntType> constexpr IntType to_integer(byte b) noexcept; } #define NULL see below #define offsetof(P, D) see below

The contents and meaning of the header are the same as the C standard library header <stddef.h>, except that it does not declare the type wchar_t, that it also declares the type byte and its associated operations ([support.types.byteops]), and as noted in [support.types.nullptr] and [support.types.layout].

17 Language support library [support]

17.2 Common definitions [support.types]

17.2.1 Header <cstddef> synopsis [cstddef.syn]