slice::size

看到元素的数目。切片的 valarray。

size_t size( ) const;

返回值

元素的数目。切片的 valarray。

示例

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

int main( )
{
   using namespace std;
   int i;
   size_t sizeVA, sizeVAR;

   valarray<int> va ( 20 ), vaResult;
   for ( i = 0 ; i < 20 ; i += 1 )
      va [ i ] =  i+1;

   cout << "The operand valarray va is:\n ( ";
      for ( i = 0 ; i < 20 ; i++ )
         cout << va [ i ] << " ";
   cout << ")." << endl;

   sizeVA = va.size ( );
   cout << "The size of the valarray is: "
        << sizeVA << "." << endl << endl;

   slice vaSlice ( 3 , 6 , 3 );
   vaResult = va [ vaSlice ];

   cout << "The slice of valarray va is vaResult = "
        << "va[slice( 3, 6, 3)] =\n ( ";
      for ( i = 0 ; i < 6 ; i++ )
         cout << vaResult [ i ] << " ";
   cout << ")." << endl;

   sizeVAR = vaSlice.size ( );
   cout << "The size of slice vaSlice is: "
        << sizeVAR << "." << endl;
}

要求

Header: <valarray>

命名空间: std

请参见

参考

slice 类