Which one of the following is the correct definition of “is_array()” function…
2023
Which one of the following is the correct definition of “is_array()” function in C++?
- A.
It checks that the specified variable is of the array or not
- B.
It checks that the specified array is of single dimension or not
- C.
It checks that the specified array is of multi-dimension or not
- D.
More than one of the above
- E.
None of the above
Attempted by 198 students.
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Correct answer: A
In C++, is_array() refers to the type trait std::is_array<T> defined in the <type_traits> header.
It is used at compile time, not as a regular runtime function.
It checks whether a given type T is an array type.
It returns true if the type is an array, and false otherwise.
It does not consider the dimensionality (single or multi-dimensional) of the array.
For example:
std::is_array<int[5]>::value // true
std::is_array::value // false
This type trait is commonly used in template metaprogramming for compile-time type checking.
So, Option A is correct (conceptually).