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std::is_trivially_copyable

STD：：是[医]琐碎[医]可复制

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

如果T是TriviallyCopyable类型，提供成员常量。value平等true.对于任何其他类型，value是false...

唯一可复制的类型是标量类型、少量可复制的类，以及此类类型/类的数组(%28可能是Const限定的，但不是易失性限定的%29)。

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_trivially_copyable_v = is_trivially_copyable::value;​(since C++17)

继承自STD：积分[医]常量

成员常数

value statictrue if T is a trivially copyable 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

可复制类型的对象是唯一可以安全复制的C++对象。std::memcpy或从二进制文件序列化为std::ofstream::write()/std::ifstream::read()一般情况下，轻微的可复制类型是指可以将基础字节复制到char数组或无符号字符的任何类型，并将其复制到同一类型的新对象中，所产生的对象将具有与原始对象相同的值。

例

二次

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

二次

产出：

二次

true
false
false

二次

另见

is_trivial (C++11)checks if a type is trivial (class template)

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