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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../types/is_trivial.html below:

std::is_trivial - cppreference.com

template< class T >
struct is_trivial;

std::is_trivial is a UnaryTypeTrait.

If T is a trivial 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 undefined.

If the program adds specializations for std::is_trivial or std::is_trivial_v, the behavior is undefined.

template< class T >
constexpr bool is_trivial_v = is_trivial<T>::value;

#include <type_traits>
 
struct A { int m; };
static_assert(std::is_trivial_v<A> == true);
 
struct B { B() {} };
static_assert(std::is_trivial_v<B> == false);
 
// The following class shows why std::is_trivial(_v) may be a pitfall.
class C
{
private:
    C() = default;
};
 
static_assert(std::is_trivial_v<C> == true);
static_assert(std::is_trivially_default_constructible_v<C> == false);
 
int main() {}

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

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