Std::is_trivial (3) Linux Manual Page

std::is_trivial – std::is_trivial

Synopsis

Defined in header<type_traits>

    template <class T>
    (since C++ 11)

        struct is_trivial;

If T is TrivialType (that is, a scalar type, a trivially copyable class with a trivial_default_constructor, or array of such type/class, possibly cv-qualified), provides the member constant value equal true. For any other type, value is false.
The behavior is undefined if std::remove_all_extents_t<T> is an incomplete type and not (possibly cv-qualified) void.

Template parameters

T – a type to check

Helper variable template

template< class T > (since C++17)
inline constexpr bool is_trivial_v = is_trivial<T>::value;

Inherited from std::integral_constant

Member constants

value true if T is a trivial type , false otherwise
(public static member constant)
[static]

Member functions

converts the object to bool, returns value
operator bool (public member function)

operator() returns value
(public member function)
(C++14)

Member types

Type Definition
value_type bool
type std::integral_constant<bool, value>

Possible implementation

  template< class T >
  struct is_trivial : std::integral_constant<
      bool,
      std::is_trivially_copyable<T>::value &&
      std::is_trivially_default_constructible<T>::value
  > {};

Example

// Run this code

#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';
}

Output:

true
false

std::is_trivial (3) Linux Manual Page