Defining Comparison Operators by Default in C++

How to Define Comparison Operators by Default in C++

C++ provides the ability to overload the comparison operators such as ==, !=, <, >, <=, and >=. These operators allow you to define the comparison between objects or types of the same kind.

The syntax for overloaded comparison operators is:

bool operator(const type &lhs, const type &rhs);

Where type is the type being compared and op is the comparison operator being overloaded.

The comparison operators must take two constant references to the same type as arguments, and return a boolean value. The values true and false are returned depending on the result of the comparison.

When defining comparison operators, you should make sure they obey the following rules:

• All comparison operators should be mutually exclusive (for example, if != returns true, != cannot return false).
• The comparison operators should be consistent (for example, if !(a>b) returns false, it should also return false for !(b>a)).
• The comparison operators should be transitive (if a>b and b>c, then a>c).
• The comparison operators should be reflexive (if a>b, then b<a).

It is important to follow these rules to ensure the comparison operators are behaving as expected.

When done correctly, defining comparison operators can help improve the readability of your code and make it easier to debug and maintain.

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