Will a base-class constructor be automatically inherited by a subclass?
Not automatically.
You can explicitly call it, however, or explicitly inherit it as in the following example:
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struct A { A(int) {} }; // base
struct B: A { using A::A; }; // inheriting constructor
struct C: A { C(int x): A(x) {} }; // explicit call
int main() {
A a{0};
B b{1};
C c{2};
}
