码迷,mamicode.com
首页 > 编程语言 > 详细

C++ POD类型

时间:2015-01-25 08:43:22      阅读:163      评论:0      收藏:0      [点我收藏+]

标签:

POD( Plain Old Data)概念:
Arithmetic types (3.9.1), enumeration types, pointer types, and pointer to member types (3.9.2), and cv-qualified(注2) versions of these types (3.9.3) are collectively called scalar types. Scalar types, POD-struct types,POD-union types (clause 9), arrays of such types and cv-qualified versions of these types (3.9.3) are collectively called POD types. 
 
如果一个class没有non-trivial 的 constructor, destructor, 以及 copy assignmet operator这些东西的话,这个class事实上已经退化成一个POD类型了,就相当于C中的struct。
 
POD类型包括下面类型:
1、标量类型,c/c++的基本类型
  • signed integer types (signed char, short, int, long),
  • unsigned integer types (unsigned char,unsigned short, unsigned int,unsigned long),
  • char and wchar_t, and
  • bool.
  • float, double, and long double
  • pointer-to-void (void *),
  • pointer-to-object and pointer-to-static-member-data (both of the form T* when pointing to an object of typeT), and
  • pointer-to-function and pointer-to-static-member-function (both of the form T (*)(...) when pointing to a function that returns an object of typeT).
  • pointer-to-nonstatic-member-data (of the form T C::* when pointing to one of classC‘s data members that has type T), and
  • pointer-to-nonstatic-member-functions (of the form T (C::*)(...) when pointing to one of classC‘s member functions that returns an object of typeT).
2、用户自定义的类类型:
  • non-static data (including arrays) of any pointer-to-member type,
  • non-static data (including arrays) of any non-POD class type,
  • non-static data of any reference type,
  • user-defined copy assignment operator, nor
  • user-defined destructor.
  • user-declared constructors,
  • private or protected non-static data members,
  • base classes, nor
  • virtual functions.

C++ POD类型

标签:

原文地址:http://www.cnblogs.com/wubugui/p/4247729.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!