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valarray::resize 

Changes the number of elements in a valarray to a specified number.


void resize(
   size_t _Newsize
);
void resize(
   size_t _Newsize, 
   const Type& _Val
);

Parameters

_Newsize

The number of elements in the resized valarray.

_Val

The value to be given to the elements of the resized valarray.

The first member function initializes elements with their default constructor.

Any pointers or references to elements in the controlled sequence are invalidated.

When compiling this example with the /Wp64 flag or on a 64-bit platform, compiler warning C4267 will be generated. For more information on this warning, see Compiler Warning (level 3) C4267.

// valarray_resize.cpp
// compile with: /EHsc
#include <valarray>
#include <iostream>

int main()
{
    using namespace std;
    int i;
    size_t size1, sizeNew;

    valarray<int> va1(10);
    for (i = 0; i < 10; i+=1)
        va1[i] = i;

    cout << "The valarray contains ( ";
        for (i = 0; i < 10; i++)
            cout << va1[i] << " ";
    cout << ")." << endl;

    size1 = va1.size();
    cout << "The number of elements in the valarray is: "
         << size1  << "." <<endl << endl;

    va1.resize(15, 10);

    cout << "The valarray contains ( ";
        for (i = 0; i < 15; i++)
            cout << va1[i] << " ";
    cout << ")." << endl;
    sizeNew = va1.size();
    cout << "The number of elements in the resized valarray is: "
         << sizeNew  << "." <<endl << endl;
}

Output

The valarray contains ( 0 1 2 3 4 5 6 7 8 9 ).
The number of elements in the valarray is: 10.

The valarray contains ( 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 ).
The number of elements in the resized valarray is: 15.

Header: <valarray>

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