Top Answers

1. Why is the construction of std::optional<int> more expensive than a std::pair<int, bool>?
   44 votes
2. C++ range-v3 library: 'take'-ing first 3 perfect numbers works and halts; 'take'-ing first 4 doesn't stop after 4
   9 votes
3. Why are C++ classes with virtual functions required to have a non-trivial copy constructor?
   6 votes
4. C++ concept to check for derived from template specialization
   4 votes
5. Conditional constexpr on non-dependent condition
   4 votes