派生类不继承基类的重载方法 [英] Derived class not inheriting overloaded method from base class

问题描述

我想在基类中有一个方法调用一个纯虚方法，将在派生类中实现。然而，基类无参数方法似乎不被继承的派生类。我做错了什么？编译器是MSVC12。

I would like to have a method in a base class call a pure virtual method that will be implemented in a derived class. However, the base class parameterless method doesn't seem to be inherited by the derived class. What am I doing wrong? Compiler is MSVC12.

错误C2660：'Derived :: load'：function不接受0个参数

error C2660: 'Derived::load' : function does not take 0 arguments

下面是一个完整的示例（由于错误而无法编译）：

Here is a complete example (that doesn't compile due to the error):

struct Base
{
    void load() { load(42); }; // Making this virtual doesn't matter.
    virtual void load(int i) = 0;
};

struct Derived : Base
{
    virtual void load(int i) {};
};

int main()
{
    Derived d;
    d.load(); // error C2660: 'Derived::load' : function does not take 0 arguments
}

推荐答案

噢，派生类确实继承 void load（）。

但是你在派生类中声明了 void load（int i），这意味着它被隐藏。

But you are declaring void load(int i) in the derived class, which means it is shadowed.

使用Base :: load; 添加到派生添加所有未覆盖的定义加载加载从基础 。

Add using Base::load; to Derived to add all non-overridden definitions of load from Base to the overload-set in Derived.

或者，使用scope-resolution-operator <$ c $显式调用 Base c> d.Base :: load（）; 。

Alternatively, call the Base-class-version explicitly with the scope-resolution-operator d.Base::load();.

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