Using begin() and end() lets you access all the elements in the View. Make it more flexible by adding a subscript operator to the class. Throw out_of_range if the subscript is out of range.
Using begin() and end() lets you access all the elements in the View. Make it more flexible by adding a subscript operator to the class. Throw out_of_range if the subscript is out of range.
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
C++
![Using begin(() and end() lets you access all the elements in the View. Make it more flexible by
adding a subscript operator to the class. Throw out_of_range if the subscript is out of range.
view.h
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#ifndef VIEWH
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#define VIEWH
#include <cstddef> // sizet
#include <stdexcept>
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template <typename T>
class View
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{
public:
View(T* a, size_t size): m_data(a), m_size(size) {}
T* begin() { return m_data; }
T* end() { return m data + m size; }
size t size() const { return m size; }
/| ...
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private:
T* m data;
size t m size;
};
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#endif
Tester.cpp
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#include <iostream>
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#include "view.h"
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using namespace std;
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int main()
{
int a[] = {1, 2, 3, 4, 5};
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View<int> v(a, 5);
for (size t i = 0, len = v.size(); i < len; ++i)
cout « v[i] « " ";
cout « "\nExpected: 1 2 3 4 5" « endl;
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for (size t i = 0, len = v.size(); i < len / 2; i++)
{
int temp = v[i];
v[i] = v[len -i - 1];
v[len - i - 1] = temp;
}
for (auto e : v) cout « e « " ";
cout « "\nExpected: 5 4 3 2 1" <« endl;
}
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CodeCheck
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Transcribed Image Text:Using begin(() and end() lets you access all the elements in the View. Make it more flexible by
adding a subscript operator to the class. Throw out_of_range if the subscript is out of range.
view.h
1
#ifndef VIEWH
2
#define VIEWH
#include <cstddef> // sizet
#include <stdexcept>
4
5
template <typename T>
class View
7
{
public:
View(T* a, size_t size): m_data(a), m_size(size) {}
T* begin() { return m_data; }
T* end() { return m data + m size; }
size t size() const { return m size; }
/| ...
9.
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private:
T* m data;
size t m size;
};
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#endif
Tester.cpp
1
#include <iostream>
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#include "view.h"
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using namespace std;
5
int main()
{
int a[] = {1, 2, 3, 4, 5};
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9.
View<int> v(a, 5);
for (size t i = 0, len = v.size(); i < len; ++i)
cout « v[i] « " ";
cout « "\nExpected: 1 2 3 4 5" « endl;
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for (size t i = 0, len = v.size(); i < len / 2; i++)
{
int temp = v[i];
v[i] = v[len -i - 1];
v[len - i - 1] = temp;
}
for (auto e : v) cout « e « " ";
cout « "\nExpected: 5 4 3 2 1" <« endl;
}
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CodeCheck
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