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This article mainly explains "how C++ uses the delegated constructor to achieve the common action of all constructors", interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn how C++ uses delegated constructors to achieve the common actions of all constructors.

C.51: use delegated constructors to achieve common actions for all constructors

Reason (reason)

Avoid repetitive and unexpected differences.

Example, bad (negative example) class Date {/ / BAD: repetitive

Int d

Month m

Int y

Public:

Date (int dd, Month mm, year yy)

: d {dd}, m {mm}, y {yy}

{if (! valid (d, m, y)) throw Bad_date {};}

Date (int dd, Month mm)

D {dd}, m {mm} y {current_year ()}

{if (! valid (d, m, y)) throw Bad_date {};}

/ /...

}

Common actions are boring to write and occasionally become unusual.

Example (sample) class Date2 {

Int d

Month m

Int y

Public:

Date2 (int dd, Month mm, year yy)

: d {dd}, m {mm}, y {yy}

{if (! valid (d, m, y)) throw Bad_date {};}

Date2 (int dd, Month mm)

: Date2 {dd, mm, current_year ()} {}

/ /...

}; Enforcement (implementation recommendations)

(medium) look for constructors with similar function bodies.

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