Denis questions

• User-defined and standard conversions
• Memory ordering with multiple releases and a single acquire
• Is implementation of double checked singleton thread-safe?
• std::unordered_set::erase complexity
• typename keyword and nested name specifier
• Ambiguous conversion to reference
• Overload resolution between const lvalue reference and rvalue reference
• Template specialization doesn't see a function in its point of instantiation
• const reference to temporary reference
• QTreeWidgetItem find child by text

Denis answers