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
struct B {
int n;
B(int i) : n(i) {}
};
struct A : B {
A(int i) {
// ...
}
};
but I get:
error: no matching function for call to ‘B::B()’
note: candidates are: B::B(int)
How would I fix this error?
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.
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.
