Constructor error message

Question

I am writing a smart contract for use within the EOSIO system contract. I am receiving this error message multiple times:

constructor for 'eosio::multi_index<13510798882111488, BP>::item' must explicitly initialize the base class 'BP' which does not have a default constructor

I have checked my constructors and they are all correct - is there something I'm missing?

Answer 1

You may have written several constructors for your BP class, but do you have a default constructor?

All classes that are to be used as multi_index arrays require that the class has a default constructor, even if it is blank.

The default constructor for BP would look like:

class BP
{
// Your stuff here

public:
  BP(){/* Your default constructor here */}
};