Which C++ type trait can be used to remove the outermost array dimension from an array type?
Options
- A. std::remove_extent
- B. std::rank
- C. std::extent
- D. More than one of the above
- E. None of the above
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Quiz Practice:
Correct Answer (Detailed Explanation is Below)
A. std::remove_extent
Detailed Explanation
Answer: (A) std::remove_extent
std::remove_extent is a type trait that removes the first or outermost array dimension from an array type.
For example, if the type is int[3][4], applying std::remove_extent removes the outermost dimension and produces a type equivalent to int[4].
This is useful in template programming when the program needs to manipulate array types at compile time.
It is different from std::rank, which only determines the number of dimensions.