c++ - C++ 中的标量类型附加

Question

关闭。此题需要 details or clarity 。目前不接受答案。

---

想要改进这个问题吗？通过 editing this post 添加详细信息并澄清问题.

已关闭 3 年前。

Improve this question

在 C 中，标量类型为:

• floating_point(双 float ，...)
• 积分(int、char、long、...)
• 指针
• 枚举

在 C++ 中，添加的标量类型只是:

• 积分( bool )
• nullprt_t
• 成员指针(成员对象指针和成员函数指针)

C++ 中只添加了三种类型标量？

Answer 1

根据标准的C++标量类型的完整列表(引用最新草案):

[basic.fundamental]

There are five standard signed integer types : “signed char”, “short int”, “int”, “long int”, and “long long int”

For each of the standard signed integer types, there exists a corresponding (but different) standard unsigned integer type

Types bool, char, wchar_­t, char8_­t, char16_­t, char32_­t, and the signed and unsigned integer types are collectively called integral types

There are three floating-point types: float, double, and long double.

Integral and floating-point types are collectively called arithmetic types.

[basic.compound]

pointers to non-static class members, which identify members of a given type within objects of a given class, [dcl.mptr]. Pointers to data members and pointers to member functions are collectively called pointer-to-member types.

The type of a pointer to cv void or a pointer to an object type is called an object pointer type. The type of a pointer that can designate a function is called a function pointer type.

[dcl.enum]

The enumeration type declared with an enum-key of only enum is an unscoped enumeration, and its enumerators are unscoped enumerators. The enum-keys enum class and enum struct are semantically equivalent; an enumeration type declared with one of these is a scoped enumeration, and its enumerators are scoped enumerators.

[basic.types]

Arithmetic types ([basic.fundamental]), enumeration types, pointer types, pointer-to-member types ([basic.compound]), std​::​nullptr_­t, and cv-qualified versions of these types are collectively called scalar types.

在这些类型中，C 缺少作用域枚举、成员指针、std::nullptr_t和char8_­t ( char8_­t 也尚未在 C++ 中；它将在即将推出的 C++20 中引入)。

bool ( <stdbool.h> ), wchar_t ( <stddef.h> ), char16_­t和char32_­t ( <uchar.h> ) 类型仅在 C 的某些标准 header 中定义。