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std::is_trivial

STD：：是[医]琐碎

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

如果T是TrivialType%28--即标量类型，是一个微不足道的可复制类，具有平凡默认构造函数，或者此类类型/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...

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_trivial_v = is_trivial::value;​(since C++17)

继承自STD：积分[医]常量

成员常数

value statictrue if T is a trivial 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>

可能的实施

模板<class T>结构是[医]平凡：STD：：整数[医]常数<bool，std：：is[医]琐碎[医]可复制<T>*Value&STD：：IS[医]琐碎[医]违约[医]可构造<T>*价值>{}；

*。

例

二次

#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    B() {}
};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_trivial<A>::value << '\n';
    std::cout << std::is_trivial<B>::value << '\n';
}

二次

产出：

二次

true
false

二次

另见

is_trivially_copyable (C++11)checks if a type is trivially copyable (class template)

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

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

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