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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it. Brian Kernighan

valarray

Language C++ | Level Intermediate | Category Standard Template Library (STL) | 2015-11-16 22:04:49

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Definition

Valarray hold the array of elements which used in mathematical operations.

Character

A valarray object is designed to hold an array of values, and easily perform mathematical operations.
Represent and manipulate array of values.
Valarray is a dynamic data structure and supports variable length of items.
Valarray has an interface to retrieve slices of the array.
Support optimizations techniques known as expression templates.

source Code

								
#include "stdafx.h"

#include < iostream >
#include < valarray >
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	valarray < int > valarray(10);

	cout << "Store items from 0 to 10 in the valarray" << endl;
	for (int i = 0; i < 10; i++)
	{
		valarray[i] = i;
	}

	cout << "Print items from valarray: ";
	for (int i = 0; i < 10; i++)
	{
		cout << valarray[i] << " ";
	}

	cout << endl<< "min() of valarray itmes: " << valarray.min() << endl;
	cout << "max() of valarray itmes: " << valarray.max() << endl;
	cout << "sum() of valarray itmes: " << valarray.sum() << endl;

	cout << endl;


	return 0;
}

						

Output

    					 
					Store items from 0 to 10 in the valarray
					Print items from valarray: 0 1 2 3 4 5 6 7 8 9
					min() of valarray itmes: 0
					max() of valarray itmes: 9
					sum() of valarray itmes: 45
					    					 
					    

When to use

The valarray array classes are defined to be free of certain forms of aliasing, thus allowing operations on these classes to be optimized.

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