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AnswerRe: In C++ compiler providing the default copy constructor ,then why do we need copy constructor Pin
David Crow20-Sep-16 5:22
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GeneralRe: In C++ compiler providing the default copy constructor ,then why do we need copy constructor Pin
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AnswerRe: In C++ compiler providing the default copy constructor ,then why do we need copy constructor Pin
jeron120-Sep-16 5:23
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AnswerRe: In C++ compiler providing the default copy constructor ,then why do we need copy constructor Pin
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QuestionRight method of swapping arrays and classes using pointers Pin
Javier Luis Lopez19-Sep-16 21:35
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AnswerRe: Right method of swapping arrays and classes using pointers Pin
Richard MacCutchan19-Sep-16 22:19
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GeneralRe: Right method of swapping arrays and classes using pointers Pin
leon de boer20-Sep-16 0:41
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GeneralRe: Right method of swapping arrays and classes using pointers Pin
Javier Luis Lopez17-Aug-17 23:11
MemberJavier Luis Lopez17-Aug-17 23:11 
The idea is use the pointers to avoid copying all the data.
An example, if there are 3 arrays of pixels: A, B, C and I want to order the arrays I can make the following operation:

C++
if (distance(A,B)>distance(A,C))
   swap(B,C);


I tried this code that swaps anything but it does not compile:
#include <iostream>
#include <string>

using namespace std;

void swap(void *&a,void *&b)
{
	void *x=a;a=b;b=x;
}

void main()
{
	int a[3]={100,101,102};
	int b[3]={200,201,202};
	cout << "a:"<<a[0]<<" "<<a[1]<<" "<<a[2]<<endl;
	cout << "b:"<<b[0]<<" "<<b[1]<<" "<<b[2]<<endl;
	swap((void *) a,(void *) b);
	cout << "a:"<<a[0]<<" "<<a[1]<<" "<<a[2]<<endl;
	cout << "b:"<<b[0]<<" "<<b[1]<<" "<<b[2]<<endl;

	cout << "=== END ===" << endl; getchar();
}


modified 18-Aug-17 5:26am.

GeneralRe: Right method of swapping arrays and classes using pointers Pin
Richard MacCutchan17-Aug-17 23:32
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GeneralRe: Right method of swapping arrays and classes using pointers Pin
Javier Luis Lopez20-Aug-17 20:19
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GeneralRe: Right method of swapping arrays and classes using pointers Pin
Richard MacCutchan20-Aug-17 21:46
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AnswerRe: Right method of swapping arrays and classes using pointers Pin
leon de boer20-Sep-16 15:27
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GeneralRe: Right method of swapping arrays and classes using pointers Pin
Saravanan Sundaresan24-Sep-16 21:01
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QuestionImage processing in C Pin
Ravi Shanakar Singh16-Sep-16 19:23
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AnswerRe: Image processing in C Pin
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AnswerRe: Image processing in C Pin
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GeneralRe: Image processing in C Pin
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QuestionCarlos Antollini ADO classes Pin
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