Which C++ type trait is used to determine the size of a particular array dimension?
Options
- A. std::rank
- B. std::extent
- C. std::is_array
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
B. std::extent
Detailed Explanation
Answer: (B) std::extent
std::extent is a type trait from the <type_traits> header. It is used to obtain the number of elements in a specified dimension of an array type.
For example, for int arr[3][4], std::extent<decltype(arr), 0>::value gives 3, while std::extent<decltype(arr), 1>::value gives 4.
Remember the difference: std::rank gives the number of dimensions, whereas std::extent gives the size of a particular dimension.