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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

Compiler Warning (level 1) C4584

Error Message

'class1' : base-class 'class2' is already a base-class of 'class3'

The class you defined inherits from two classes, one of which inherits from the other. For example:

// C4584.cpp
// compile with: /W1 /LD
class A {
};

class B : public A {
};

class C : public A, public B { // C4584
};

In this case, a warning would be issued on class C because it inherits both from class A and class B, which also inherits from class A. This warning serves as a reminder that you must fully qualify the use of members from these base classes or a compiler error will be generated due to the ambiguity as to which class member you refer.

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