default

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In a switch statement, introduces a label that will be jumped to if the condition’s value is not equal to any of the case labels’ values.

char c = getchar();
bool confirmed;
switch (c) {
  case 'y':
    confirmed = true;
    break;
  case 'n':
    confirmed = false;
    break;
  default:
    std::cout << "invalid response!\n";
    abort();
}

Defines a default constructor, copy constructor, move constructor, destructor, copy assignment operator, or move assignment operator to have its default behaviour.

class Base {
    // ...
    // we want to be able to delete derived classes through Base*,
    // but have the usual behaviour for Base's destructor.
    virtual ~Base() = default;
};

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