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The latest version of this topic can be found at Compiler Warning (level 4) C4623.
derived class`' : default constructor was implicitly defined as deleted because a base class default constructor is inaccessible or deleted
A constructor was not accessible in a base class and was not generated for the derived class. Any attempt to create an object of this type on the stack will cause a compiler error.
This warning is off by default. See Compiler Warnings That Are Off by Default for more information.
Example
The following sample generates C4623.
// C4623.cpp
// compile with: /W4
#pragma warning(default : 4623)
class B {
B();
};
class C {
public:
C();
};
class D : public B {}; // C4623 - to fix, make B's constructor public
class E : public C {}; // OK - class C constructor is public
int main() {
// D d; will cause an error
}