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std::is_standard_layout

STD：：是[医]标准[医]布局

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

如果T是标准布局类型%28，即标量类型、标准布局类或此类类型/类的数组(可能是cv限定%29)提供成员常量。value平等true.对于任何其他类型，value是false...

阿标准布局类是满足以下条件的类StandardLayoutType...

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_standard_layout_v = is_standard_layout::value;​(since C++17)

继承自STD：积分[医]常量

成员常数

value statictrue if T is a standard-layout 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

指向标准布局类的指针可以通过重新解释而转换为%28。[医]将%29转换为指向其第一个非静态数据成员的指针，反之亦然。

如果标准布局联合包含两个或多个标准布局结构，则允许检查它们的公共初始部分。

宏offsetof只能与标准布局类一起使用。

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_standard_layout<A>::value << '\n';
    std::cout << std::is_standard_layout<B>::value << '\n';
    std::cout << std::is_standard_layout<C>::value << '\n';
}

二次

产出：

二次

true
false
false

二次

另见

is_trivially_copyable (C++11)checks if a type is trivially copyable (class template)
is_pod (C++11)checks if a type is plain-old data (POD) type (class template)
offsetofbyte offset from the beginning of a standard-layout type to specified member (function macro)

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

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