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std::is_pod

STD：：是[医]吊舱

Defined in header ​​
template< class T > struct is_pod;​(since C++11)

如果T是PODType%28“普通旧数据类型”%29，即简单的和标准的布局，提供成员常量。value平等true.对于任何其他类型，value是false...

如果std::remove_all_extents_t<T>是不完整的类型，而不是%28可能是cv-合格%29。void...

模板参数

T-a type to check

辅助变量模板

template< class T > inline constexpr bool is_pod_v = is_pod::value;​(since C++17)

继承自STD：积分[医]常量

成员常数

value statictrue if T is a POD type , false otherwise (public static member constant)

成员函数

operator boolconverts the object to bool, returns value (public member function)
operator() (C++14)returns value (public member function)

成员类型

TypeDefinition
value_typebool
typestd::integral_constant<bool, value>

注记

POD类型的对象与C语言完全兼容。

例

二次

#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    int m1;
private:
    int m2;
};
 
struct C {
    virtual void foo(
};
 
int main()
{
    std::cout << std::boolalpha;
    std::cout << std::is_pod<A>::value << '\n';
    std::cout << std::is_pod<B>::value << '\n';
    std::cout << std::is_pod<C>::value << '\n';
}

二次

产出：

二次

true
false
false

二次

另见

is_standard_layout (C++11)checks if a type is standard-layout type (class template)
is_trivial (C++11)checks if a type is trivial (class template)

 © cppreference.com

在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。

http：//en.cppreference.com/w/cpp/type/is[医]吊舱

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