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52e62633
编写于
6月 17, 2021
作者:
H
Herb Sutter
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Add Tour2e example to C.126, closes #1794
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# <a name="main"></a>C++ Core Guidelines
March 11
, 2021
June 17
, 2021
Editors:
...
...
@@ -6941,7 +6941,7 @@ Class hierarchy rule summary:
Designing rules for classes in a hierarchy summary:
* [C.126: An abstract class typically doesn't need a constructor](#Rh-abstract-ctor)
* [C.126: An abstract class typically doesn't need a
user-written
constructor](#Rh-abstract-ctor)
* [C.127: A class with a virtual function should have a virtual or protected destructor](#Rh-dtor)
* [C.128: Virtual functions should specify exactly one of `virtual`, `override`, or `final`](#Rh-override)
* [C.129: When designing a class hierarchy, distinguish between implementation inheritance and interface inheritance](#Rh-kind)
...
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@@ -7114,7 +7114,7 @@ Furthermore, we can update `D1` and `D2` in ways that are not binary compatible
## C.hierclass: Designing classes in a hierarchy:
### <a name="Rh-abstract-ctor"></a>C.126: An abstract class typically doesn't need a constructor
### <a name="Rh-abstract-ctor"></a>C.126: An abstract class typically doesn't need a
user-written
constructor
##### Reason
...
...
@@ -7122,7 +7122,20 @@ An abstract class typically does not have any data for a constructor to initiali
##### Example
???
class Shape {
public:
// no user-written constructor needed in abstract base class
virtual Point center() const =0; // pure virtual
virtual void move(Point to) =0;
// ... more pure virtual functions...
virtual ~Shape() {} // destructor
};
class Circle : public Shape {
public:
Circle(Point p, int rad); // constructor in derived class
Point center() const override { return x; }
};
##### Exception
...
...
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