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<cstddef>

  • Artikkeli

Includes the C standard library header <stddef.h> and adds associated names to the std namespace. Including this header ensures that the names declared using external linkage in the C standard library header are declared in the std namespace.

Note

<cstddef> includes type byte and doesn't include type wchar_t.

Syntax

#include <cstddef>

Namespace and Macros

namespace std {
    using ptrdiff_t = see definition;
    using size_t = see definition;
    using max_align_t = see definition;
    using nullptr_t = decltype(nullptr);
}

#define NULL  // an implementation-defined null pointer constant
#define offsetof(type, member-designator)

Parameters

ptrdiff_t
An implementation-defined signed integer type that can hold the difference of two subscripts in an array object.

size_t
An implementation-defined unsigned integer type that is large enough to contain the size in bytes of any object.

max_align_t
A POD type whose alignment requirement is at least as great as that of every scalar type, and whose alignment requirement is supported in every context.

nullptr_t
A synonym for the type of a nullptr expression. Although a nullptr address can't be taken, the address of another nullptr_t object that is an lvalue can be taken.

byte Class

enum class byte : unsigned char {};

template <class IntType>
    constexpr byte& operator<<=(byte& b, IntType shift) noexcept;
    constexpr byte operator<<(byte b, IntType shift) noexcept;
    constexpr byte& operator>>=(byte& b, IntType shift) noexcept;
    constexpr byte operator>>(byte b, IntType shift) noexcept;

constexpr byte& operator|=(byte& left, byte right) noexcept;
constexpr byte operator|(byte left, byte right) noexcept;
constexpr byte& operator&=(byte& left, byte right) noexcept;
constexpr byte operator&(byte left, byte right) noexcept;
constexpr byte& operator^=(byte& left, byte right) noexcept;
constexpr byte operator^(byte left, byte right) noexcept;
constexpr byte operator~(byte b) noexcept;

template <class IntType>
    IntType to_integer(byte b) noexcept;

See also

Header Files Reference
C++ Standard Library Overview
Thread Safety in the C++ Standard Library