Review

Pointer vs Reference

• Pointer can be nullptr, while reference is always bound to an object
• Pointer can be adjusted to point to different objects at different times
• For pointer, * and -> are needed to access the underlying object, while reference always refers to the object

Initializer List

• Does not allow narrowing conversion (e.g. float to int, char to int is ok)
• Works for array, class objects

Range-for Statement

for (int k : { 1, 3, 5, 6, 9 }) {
    // Numbers need not to be successive
}

Const-ness

• Mark any function that do not modify member variables as const to avoid errors
• Const object can only call const member functions, non-const object can call both

e.g. void Date::print() const; is compiled to void Date::print(const Date* this);

e.g. void Date::print(); is compiled to void Date::print(Date* this);

Lambda

Capture

• [=] capture all local variables by value
• [&] capture all local variables by reference
• [variables] specify only the variables to capture
• global variables are always usable

Return

• void by default
• Automatically inferred if there is return
• Explicitly specified by []() -> type {}