Wizmann questions

• How can I change the default seed in std::hash<>?
• Why explicit initialization list is more likely to failure?
• How do C and C++ compilers implement the decision of equality for float numbers?
• Why do compilers (e.g. gcc) deal with the memory layout of derived classes in this way?
• The constructor function in a pure virtual class should be "protected" or "public"?

Wizmann answers