从另一个类的成员函数编辑私有类成员

Question

我的两个课程是：

class sequence
{
public:
...

private:
int number_of_samples;
float* samples;
};

class FIR
{
public:
...

sequence* apply_filter(const sequence& f);

private:
int number_of_coefficients;
float* coefficients;
};

当我运行以下成员函数时：

sequence* FIR::apply_filter(const sequence& f)
{
ofstream output_sequence_file("output.txt");
output_sequence_file<<number_of_coefficients<<endl;
sequence* Vout = new sequence;
for(int i=0;i<number_of_coefficients;i++)
{
    if (0==i) Vout->samples[i]=coefficients[i]*f.samples[i];
    else Vout->samples[i]=coefficients[i] * f.samples[i] + Vout->samples[i-1];

output_sequence_file<<Vout->samples[i]<<endl;
}
}

我收到错误消息：＆＃39;样本＆＃39;是序列的私人成员。

有任何帮助吗？ 谢谢

Answer 1

将samples移至class sequence的公开部分，或声明FIR::apply_filter() friend class sequence。除非已授予其特权，否则其他类或函数无法访问类的私有成员。