Write a function called // Precondition: p1, p2 and p3 either point // to dynamically created integers or are // equal to nullptr void allocate3(int* &p1, int* &p2, int* &p3) that will dynamically allocate space for three integers initialized to 0. If the pointers already point to dynamic memory, that memory should fırst be deleted. The function should have a strong exception guarantee. If any of the allocations fails by new throwing a bad_alloc exception, the function should also throw that exception after fulfilling its guarantee. int *a, *b = nullptr, *c = nullptr; a = new int (2); allocate3(a, b, c); // a’s previous memory is deleted cout <« *a « *b << *c« endl; // prints 000 nullptr; int *x, *y = nullptr, *z = X = new int (2); try { // allocating memory for y throws badalloc below allocate3(x, y, z); } catch (bad_alloc) { } cout <« *x « endl; // prints 2

Write a function called // Precondition: p1, p2 and p3 either point // to dynamically created integers or are // equal to nullptr void allocate3(int* &p1, int* &p2, int* &p3) that will dynamically allocate space for three integers initialized to 0. If the pointers already point to dynamic memory, that memory should fırst be deleted. The function should have a strong exception guarantee. If any of the allocations fails by new throwing a bad_alloc exception, the function should also throw that exception after fulfilling its guarantee. int a, b = nullptr, c = nullptr; a = new int (2); allocate3(a, b, c); // a’s previous memory is deleted cout <« a « b << c« endl; // prints 000 nullptr; int x, y = nullptr, z = X = new int (2); try { // allocating memory for y throws badalloc below allocate3(x, y, z); } catch (bad_alloc) { } cout <« x « endl; // prints 2

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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### Question 11

**Task**: Write a function called `allocate3`.

```cpp
// Precondition: p1, p2 and p3 either point
// to dynamically created integers or are
// equal to nullptr
void allocate3(int* &p1, int* &p2, int* &p3)
```

The function dynamically allocates space for three integers initialized to 0. If the pointers already point to dynamic memory, that memory should first be deleted. The function should have a strong exception guarantee. If any of the allocations fail by `new` throwing a `bad_alloc` exception, the function should also throw that exception after fulfilling its guarantee.

Example usage:

```cpp
int *a, *b = nullptr, *c = nullptr;
a = new int (2);
allocate3(a, b, c); // a’s previous memory is deleted
cout << *a << *b << *c << endl; // prints 000

int *x, *y = nullptr, *z = nullptr;
x = new int (2);
try {
// allocating memory for y throws badalloc below
allocate3(x, y, z);
} catch (bad_alloc) { }
cout << *x << endl; // prints 2
```

This code demonstrates how to handle dynamic memory allocation with strong exception safety in C++. The `allocate3` function ensures that memory is properly managed and exceptions are handled cleanly.

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