std::is_trivially_copyable 是一元类型特征 (UnaryTypeTrait) 。 如果T 是可平凡复制 (TriviallyCopyable) 类型,那么提供的成员常量 value 等于true。对于其它任何类型,value 等于false。 如果std::remove_all_extents_t<T> 是不完整类型且并非(可有 cv 限定的)
com/w/cpp/concept/TriviallyCopyable](http://en.cppreference.com/w/cpp/concept/TriviallyCopyable) - [http://en.cppreference.com/w/cpp/types/is\_trivially\_copyable](http://en.cppreference.com/w/cpp/types/is_trivially_copyable) - [https://github.com/cplusplus/draft/blob/master/papers/n475...
wchar_t是宽字符类型，每个wchar_t类型占2个字节，16位宽。
https://en.cppreference.com/w/cpp/types/is_trivially_copyable. Maybe your toolset doesn't implement C++11 fully. Please add information on the platform (OS, compiler, standard library implementation, and their versions) you are using. hurdad commented Aug 7, 2019 CentOS 7 GCC 4.8.5 ...
"<<std::is_trivially_copyable<C>::value<<std::endl;// cpp containers are not trivially copyablestd::cout<<"map: "<<std::is_trivially_copyable<std::map<int,int>>::value<<std::endl;std::cout<<"vec: "<<std::is_trivially_copyable<std::vector<int>>::value<<std::endl;return0;}...
std::is_trivially_copyable is a UnaryTypeTrait. If T is a trivially copyable type, provides the member constant value equal to true. For any other type, value is false. If std::remove_all_extents_t<T> is an incomplete type and not (possibly cv-qualified) void, the behavior is ...