C++ 未定义的引用;vtable“;
这是我的节目。它有一个基类Point、一个从Point继承的类Color_Point和一个从Color_Point继承的类dim3_Point。在类点中有一个虚拟函数初始值设定项(),在其他类中也有一个C++ 未定义的引用;vtable“;,c++,inheritance,virtual-functions,vtable,C++,Inheritance,Virtual Functions,Vtable,这是我的节目。它有一个基类Point、一个从Point继承的类Color_Point和一个从Color_Point继承的类dim3_Point。在类点中有一个虚拟函数初始值设定项(),在其他类中也有一个 #include <stdio.h> #include <conio.h> #include <iostream> #define BLACK 0 using namespace std; class point { private:
#include <stdio.h>
#include <conio.h>
#include <iostream>
#define BLACK 0
using namespace std;
class point
{
private:
float x,y;
public:
point();
point(float ox , float oy );
point(const point &p);
~point();
void display();
void move(float dx, float dy);
virtual void Initializer()
{
cout << "Diem khong mau hic hic" << endl;
}
};
class colored_point: public point
{
private:
unsigned int color;
public:
colored_point(): point()
{
color = BLACK;
}
colored_point(float ox , float oy , unsigned int Color = BLACK): point(ox,oy )
{
cout << "Goi ham to mau " << endl;
color = Color;
}
colored_point(const colored_point &p_color);
void Initializer();
~colored_point();
//void display();
};
class dim3_point: public colored_point
{
private:
float z;
public:
dim3_point();
dim3_point(float ox, float oy, float oz, unsigned int Color = BLACK);
dim3_point(const dim3_point &p);
~dim3_point();
void Initializer();
};
int main()
{
point *atsm;
colored_point P1(2,3,5);
atsm = &P1;
atsm->display();
getch();
return 0;
}
point::point()
{
x = 0, y =0;
}
point::point(float ox , float oy )
{
cout << "Goi ham point::point" << endl;
x = ox, y = oy;
}
point::point(const point &p)
{
x = p.x, y = p.y;
}
point::~point()
{
cout << "Burn baby burn !!" << endl;
}
void point::display()
{
cout << "Toa do:" << x << "," << y << endl;
Initializer();
}
void point::move(float dx, float dy)
{
x += dx, y += dy;
}
//void point::Initializer()
//{
// cout << "Diem khong mau hic hic" << endl;
//}
colored_point::colored_point(const colored_point &p): point::point((point&)p)
{
color = p.color;
}
colored_point::~colored_point()
{
}
dim3_point::dim3_point(): colored_point::colored_point()
{
z = 0;
}
dim3_point::dim3_point(float ox, float oy, float oz, unsigned int Color): colored_point::colored_point(ox, oy, Color)
{
cout << "Goi ham 3D" << endl;
z = oz;
}
dim3_point::dim3_point(const dim3_point &p): colored_point::colored_point((const colored_point&) p )
{
}
我知道还有其他类似的帖子,但到目前为止,它们还没有为我工作。多谢各位 通过clang抛出相同的代码示例(很好地注释了conio.h和getch())提供了以下功能:
Undefined symbols for architecture x86_64:
"vtable for dim3_point", referenced from:
dim3_point::dim3_point() in stackex-7c554b.o
dim3_point::dim3_point(float, float, float, unsigned int) in stackex-7c554b.o
dim3_point::dim3_point(dim3_point const&) in stackex-7c554b.o
NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
"vtable for colored_point", referenced from:
colored_point::colored_point(colored_point const&) in stackex-7c554b.o
colored_point::colored_point() in stackex-7c554b.o
colored_point::colored_point(float, float, unsigned int) in stackex-7c554b.o
NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
注意这里clang提供的“Note”,然后检查您在类中定义的所有虚拟函数是否都有实现。(在本例中,Initialize在两个子类中都缺少实现,即使它们的类定义中都有该函数的原型)
这将修复编译错误。但是如上所述,如果类中有任何虚拟函数,也应该将析构函数设置为虚拟。将类层次结构中的所有析构函数设置为虚拟。另外,请提供一个复制错误的方法,而不是在此处转储所有代码
Undefined symbols for architecture x86_64:
"vtable for dim3_point", referenced from:
dim3_point::dim3_point() in stackex-7c554b.o
dim3_point::dim3_point(float, float, float, unsigned int) in stackex-7c554b.o
dim3_point::dim3_point(dim3_point const&) in stackex-7c554b.o
NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
"vtable for colored_point", referenced from:
colored_point::colored_point(colored_point const&) in stackex-7c554b.o
colored_point::colored_point() in stackex-7c554b.o
colored_point::colored_point(float, float, unsigned int) in stackex-7c554b.o
NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)