CODEWITHSUNDEEP
c++assignment-operator
Sanjay Singh
Sanjay Singh

Reputation: 59

copy assignment operator definition

what would be the definition of copy assignment operator of a class if a class having const member variable and a reference member variable eg:

class ABC
{
  int const i;
  int & j;
  int k;
  public :
  ABC() :k(40), i(10),j(k)
  {}
};

Upvotes: 1

Views: 213

Answers (1)

eerorika
eerorika

Reputation: 238311

Const objects and references are non-assignable. Therefore a class that has such members will not have implicit assignment operators. It is possible to define a custom assignment operator, but not in a way that modifies those members.

If you want your class to have a copy assignment that makes the reference to refer to the same object as was referred by the argument object, then you simply cannot use a reference for that purpose.

If you want your class to have a copy assignment that makes a const member to have the same value as the argument object, then you simply cannot use a const member.

for const we can do it with the help of const_cast

Modifying a const object (with help of const_cast) has undefined behaviour.

Upvotes: 1

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