迭代指针的std :: vector时出错

Question

I need to copy a std::vector that containing pointers to a class. The function is:

Clone::Clone( const Clone &source )
{
    m_pDerivate.clear();

    std::vector<Derivate *>::const_iterator it;
    it = source.m_pDerivate.begin();
    for (it = source.m_pDerivate.begin(); it != source.m_pDerivate.end(); ++it) {
        m_pDerivate.push_back(new Derivate(it));
    }
}

And the Derivate constructor is:

Derivate::Derivate( const Derivate &source )
{
    _y = source._y; 
    _m = _strdup(source._m);
}

But when I compile, I get the following error ...

 cannot convert parameter 1 from 'std::_Vector_const_iterator<_Myvec>' to 'const Derivate &'

... in the line:

m_pDerivate.push_back(new Derivate(it));

If I change the line by ...

m_pDerivate.push_back(new Derivate((const Derivate &)(*it)));

... compile fine but the Derivate constructor not receives the data correctly.

Can you help me?

Thanks in advance.

Answer 1

You need to dereference the iterator and the pointer:

• *it is of type Derivate*
• **it is of type Derivate

Change:

m_pDerivate.push_back(new Derivate(it));

to:

m_pDerivate.push_back(new Derivate(**it));