Question

I have a class field

char chars[4]

I want to init this field in the constructor.
My constructor need to get char chars[] as a parameter and in the constructor call I want to init my class fields.
Can I do it or I need to call copy?

Answer 1

You need to call copy.

MyClass::MyClass(const char* param)
{
  std::copy(param, param + 4, chars);
}

This is slightly risky code since there is no guarantee that param has four characters to copy.