Q:

Class inherited from class without default constructor

Right now I have a class A that inherits from class B, and B does not have a default constructor. I am trying the create a constructor for A that has the exact same parameters for B's constructor, but I get:
error: no matching function for call to ‘B::B()’
note: candidates are: B::B(int)

How would I fix this error?

A:

The constructor should look like this:
A(int i) : B(i) {}

The bit after the colon means, "initialize the B base class sub object of this object using its int constructor, with the value i".
I guess that you didn't provide an initializer for B, and hence by default the compiler attempts to initialize it with the non-existent no-args constructor.

A:

You need to invoke the base constructor via your class' initializer list.
Example:
class C : public B
{
public:
    C(int x) : B(x)
    {
    }

};

When you don't initialize B explicitly it will try to use the default constructor which has no parameters.

