valarray::size
Finds the number of elements in a valarray.
size_t size( ) const;
Return Value
The number of elements in the operand valarray.
Example
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_size.cpp
// compile with: /EHsc
#include <valarray>
#include <iostream>
int main()
{
using namespace std;
int i;
size_t size1, size2;
valarray<int> va1(10), va2(12);
for (i = 0; i < 10; i += 1)
va1[i] = i;
for (i = 0; i < 10; i += 1)
va2[i] = i;
cout << "The operand valarray va1(10) is: ( ";
for (i = 0; i < 10; i++)
cout << va1[i] << " ";
cout << ")." << endl;
size1 = va1.size();
cout << "The number of elements in the valarray va1 is: va1.size = "
<< size1 << "." <<endl << endl;
cout << "The operand valarray va2(12) is: ( ";
for (i = 0; i < 10; i++)
cout << va2[i] << " ";
cout << ")." << endl;
size2 = va2.size();
cout << "The number of elements in the valarray va2 is: va2.size = "
<< size2 << "." << endl << endl;
// Initializing two more elements to va2
va2[10] = 10;
va2[11] = 11;
cout << "After initializing two more elements,\n "
<< "the operand valarray va2(12) is now: ( ";
for (i = 0; i < 12; i++)
cout << va2[i] << " ";
cout << ")." << endl;
cout << "The number of elements in the valarray va2 is still: "
<< size2 << "." << endl;
}
The operand valarray va1(10) is: ( 0 1 2 3 4 5 6 7 8 9 ). The number of elements in the valarray va1 is: va1.size = 10. The operand valarray va2(12) is: ( 0 1 2 3 4 5 6 7 8 9 ). The number of elements in the valarray va2 is: va2.size = 12. After initializing two more elements, the operand valarray va2(12) is now: ( 0 1 2 3 4 5 6 7 8 9 10 11 ). The number of elements in the valarray va2 is still: 12.
Requirements
Header: <valarray>
Namespace: std