C.140:不要为虚函数和它的覆盖函数设定不同的默认参数
That can cause confusion: An overrider does not inherit default arguments.
这可能会引起混乱:覆盖函数不会继承默认参数。
class Base {
public:
virtual int multiply(int value, int factor = 2) = 0;
virtual ~Base() = default;
};
class Derived : public Base {
public:
int multiply(int value, int factor = 10) override;
};
Derived d;
Base& b = d;
b.multiply(10); // these two calls will call the same function but
d.multiply(10); // with different arguments and so different results
Enforcement(实施建议)
Flag default arguments on virtual functions if they differ between base and derived declarations.
如果基类和派生的虚函数和覆盖函数的默认参数不同,进行提示。
原文链接
https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#c140-do-not-provide-different-default-arguments-for-a-virtual-function-and-an-overrider
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