How does C++ use delegated constructors to achieve common actions of all constructors?
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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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