English 中文(简体)
虚拟功能不需要大多数衍生类别
原标题:Virtual function not called on most derived class type

www.un.org/spanish/ecosoc Edit Solved和Reposted作为样本方案

设想情况如下:

等级等级:

class Base
{
public:
   virtual void output() = 0;
private:
   int a;
};

class Derived_1 : public Base
{
public:
   virtual void output()
   {
      cout << "Derived_1" << endl;
   }
};

class Derived_2 : public Derived_1
{
public:
   virtual void output()
   {
      cout << "Derived_2" << endl;
   }
};

执行:

Derived_2* obj = reinterpret_cast<Derived_2*>(new Derived_1());
obj->output();

这将产生“依赖1”而不是“依赖2”。 我相信,这对你们大多数人来说并不陌生,但在我提出申请时,我并没有想到我的一些工厂职能。

最佳回答

页: 1 页: 1 价值_object_uint32 无改动。 实际物体表对<代码>无所知。 数值_object_uint32 ;在其虚拟功能表中,该表是在err...施工时建造的,format各点至Value_object_data sformat 。 强化标明实际物体的点数类型,对确定情况没有任何影响。

特定等级的所有基级和遗产等级的构造都从最深层的根基中挑选出来,每类各有一次。 这意味着,你不必明确叫作基类建筑商。 将自动称为。 如果你需要具体说明应当使用哪些基类建筑商,你也可以这样做:

class Base
{
public:
    Base() {} // default constructor
    Base(int a) {}
};

class Derived
{
public:
    Derived() : Base()
    {
    }

    Derived(int a)
      : Base(a) // Select the Base ctor that takes an int, instead of the default
    {
    }
};

int main()
{
    Derived d1;    // Calls Derived() and Base() ctors in this order
    Derived d2(5); // Calls Derived(5) and Base(5) in this order
}

当然,无需打上<代码>Base(int)的构造。 在这种情况下,将自动称作<代码>Base()。

问题回答

http://www.ohchr.org。 答案是根据所贴出的原始代码。 检察官办公室在看到拖拉式实例按预期发挥作用后更新了该编码样本。


你的法典是完全正确的,但像现在这样做的事情的最常见原因是,当你试图推翻签字时,你确实没有获得签名,而你却制造了超负荷。 当你通过基类呼吁时,它仍将正确地称之为基类。

签字中的一切事项——一个常见错误是,这种方法的连贯性是签字的一部分。

至少打破了<代码>new_VO_data()。 它可能或可能不会因为表形大小和变量的pa而发挥作用,而后者按标准是任意的,取决于汇编者的选择。 简言之,行为不明确。





相关问题
Undefined reference

I m getting this linker error. I know a way around it, but it s bugging me because another part of the project s linking fine and it s designed almost identically. First, I have namespace LCD. Then I ...

C++ Equivalent of Tidy

Is there an equivalent to tidy for HTML code for C++? I have searched on the internet, but I find nothing but C++ wrappers for tidy, etc... I think the keyword tidy is what has me hung up. I am ...

Template Classes in C++ ... a required skill set?

I m new to C++ and am wondering how much time I should invest in learning how to implement template classes. Are they widely used in industry, or is this something I should move through quickly?

Print possible strings created from a Number

Given a 10 digit Telephone Number, we have to print all possible strings created from that. The mapping of the numbers is the one as exactly on a phone s keypad. i.e. for 1,0-> No Letter for 2->...

typedef ing STL wstring

Why is it when i do the following i get errors when relating to with wchar_t? namespace Foo { typedef std::wstring String; } Now i declare all my strings as Foo::String through out the program, ...

C# Marshal / Pinvoke CBitmap?

I cannot figure out how to marshal a C++ CBitmap to a C# Bitmap or Image class. My import looks like this: [DllImport(@"test.dll", CharSet = CharSet.Unicode)] public static extern IntPtr ...

Window iconification status via Xlib

Is it possible to check with the means of pure X11/Xlib only whether the given window is iconified/minimized, and, if it is, how?

热门标签