class a : b默认是什么派生？

[belief888]

class a : b默认是什么派生？谢谢。我想可能是全局吧？你们说呢？谁有书查？

[pyl2001]

默认public

[hx]

我有一本，是C++教程，清大的。

[fangrk]

我记得默认的继承是private

[poly30]

public

[cwanter]

应该是private.

[LionEagle]

是private

class A
{
public:
int x;
A(){ x = 2; }
};

class B : public A
{
};

void main()
{
B x;

x.x = 5; // 编译出错
}

[LionEagle]

不好意思，写错了，应该是

是private

class A
{
public:
int x;
A(){ x = 2; }
};

class B : A
{
};

void main()
{
B x;

x.x = 5; // 编译出错
}

[cstpjl]

应该是PRIVATE

[reven_zl]

默认是public,如果是private的话，子类的子类不是看不到基类中的任何东西了吗

[cwanter]

唉，再看看书吧

[招RD和QA]

class a;

class b : a
{
};

相当于
class b : private a
{
};

struct b : a
{
};

相当于
struct b : public a
{
};

[belief888]

服了。。。怎么说什么的都有呢？其实我认为应该是PUBLIC，不过有本书上写着是私有的。

[loader]

当然是private

[ljan]

agree viper()

对于类，默认是private, 对于struct,
默认是public, 我想应该源于C,

class a
{
public:
int i;
void fun(){}
};

class b : a
{
public:

};

class c : public b
{
public:
void f()
{
i = 10;
}

};
error C2247: 'i' not accessible because 'b' uses 'private' to inherit from 'a'

[ashchan]

private, 见The C++ Programming Language pg405，摘录如下：
The access specifier for a base class can be left out. In that case, the base defaults to a private base for a class and a public base for a struct.