Concept: Regular Type

A RegularType is a concept that requires the following. Consider an object type X. If X is a RegularType, then at minimum it implements assignment, default constructor, copy constructor, and equality comparison.

C++ regular types

In C++, a class X (object type) that is a RegularType if it has the following operations (overload set):

1. Assignment: bool operator=(const X&) must be implemented.
2. Default constructor: X::X() must be implemented.
3. Copy constructor: X::X(const X&) must be implemented.
4. Equality: bool operator==(const X&) must be implemented.

For example, the following code snippet must compile successfully.

    X x;                        // default constructor
    X y(x);                     // copy constructor
    std::static_assert(y == x); // equality comparison
    y = x;                      // assignment