File: AB.h

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef AB_H
#define AB_H

#include <cassert>

class A
{
    int id_;
public:
    explicit A(int id) : id_(id) {++count;}
    A(const A& a) : id_(a.id_) {++count;}
    virtual ~A() {assert(id_ >= 0); id_ = -1; --count;}

    A& operator=(const A& other) { id_ = other.id_; return *this; }

    static int count;
};

int A::count = 0;

class B
    : public A
{
public:
    explicit B(int id) : A(id) {++count;}
    B(const B& a) : A(a) {++count;}
    virtual ~B() {--count;}

    static int count;
};

int B::count = 0;

#endif // AB_H