is_trivial function in C++
is_trivial function is used to check whether the given type T is a trivial class or not. It is a template is declared in <type_traits> header file. A trivial type is a type whose storage is contiguous (trivially copyable) and which only supports static default initialization (trivially default constructible), either cv-qualified or not. It includes scalar types, trivial classes, and arrays of any such types.
A trivial class is a class (defined with class, struct, or union) that is both trivially default constructible and trivially copyable, which implies that:
It uses the implicitly defined default, copy and move constructors, copy and move assignments, and destructor.
- It has no virtual members.
- It has no non-static data members with a brace- or equal- initializers.
- Its base class and non-static data members (if any) are themselves also trivial types.
is_trivial inherits from integral_constant as being either true_type or false_type, depending on whether T is a trivial type.
template struct is_trivial;
A: true B: false C: false D: false
Here, A is a class that has been passed as a parameter to the function is_trivial and it will return a value of integral constant type bool i.e. true or false.
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