. 51 s: Represent the Use The Delegating Constructors Common to All Actions for Constructors of A class
. 51 s: delegate using a constructor implemented in common operation of all constructors
Delegate constructor is a new feature introduced in C ++ 11, please refer to the specific author of the following article:
https://mp.weixin.qq.com/s/sHyLCI1tkLWvxfBKUiKwMg
Reason (reason)
To avoid repetition and accidental differences.
Avoid duplication and unexpected differences.
Example, bad (negative sample)
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{}; }
// ...
};
The common action gets tedious to write and may accidentally not be common.
Common action to write tedious, occasionally become common.
Example (Example)
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()} {}
// ...
};
See also: If the "repeated action" is a simple initialization, consider an in-class member initializer.
Reference: If the "repeat action" simply initialization, class member initializer contemplated.
Enforcement (Suggestions)
(Moderate) Look for similar constructor bodies.
(Average) looking similar body of the constructor.
Description link
https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#c51-use-delegating-constructors-to-represent-common-actions-for-all-constructors-of-a-class
I think this article helpful? Welcome thumbs up and share it with more people.
Read more updated articles, please pay attention to micro-channel public number of object-oriented thinking []
