Copying object with memcpy

[Cruz]

When writing a custom assignment operator, is there a caveat to first copying the whole object with a memcpy rather than tediously field by field, and then fixing the pointers and such? This is what I mean:

MyObject& MyObject::operator=(const MyObject &o)
{
    memcpy(this, &o, sizeof(MyObject)); // Copy everything in one go.
 
    // Do other things like fix pointers.
 
    return *this;
}

MyObject& MyObject::operator=(const MyObject &o)
{
    memcpy(this, &o, sizeof(MyObject)); // Copy everything in one go.

    // Do other things like fix pointers.

    return *this;
}

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