Which C++ type trait is used to determine whether a type is a reference type?
Options
- A. std::is_reference
- B. std::is_pointer
- C. std::is_void
- D. More than one of the above
- E. None of the above
Quiz Practice:
A. std::is_reference
Answer: (A) std::is_reference
std::is_reference checks whether a specified type is a reference type.
For example, std::is_reference<int&>::value returns true because int& is an lvalue reference type.
A normal type such as int is not a reference, so the result would be false.
This trait is commonly useful in template metaprogramming and generic programming.