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This article mainly explains "what is the use of C++ definition operator", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "what is the use of the C++ definition operator?"

Operators are defined mainly to imitate idioms

Reason (reason)

Minimize surprises.

Make the program look more natural.

Example (sample)

Class X {

Public:

/ /...

X & operator= (const X &); / / member function defining assignment

Friend bool operator== (const const, const X &); / / = = needs access to representation

/ / after a = b we have a = = b

/ /...

}

Here, the conventional semantics is maintained: Copies compare equal.

Here, the customary semantics of assignment and equality comparison are maintained.

Example, bad (negative example)

X operator+ (X a, X b) {return a.v-b.v;} / / bad: makes + subtractNote (note)

Nonmember operators should be either friends or defined in the same namespace as their operands. Binary operators should treat their operands equivalently.

The non-member operator should be either a friend function or defined with an Operand. Binary operators should treat operands equally.

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