valarray::operator~

按位获取每个元素的 NOT 值。valarray的一元运算符。

valarray<Type> operator~( ) const;

返回值

按位"是该操作数的元素值 NOT valarray的valarray布尔值。

备注

操作只能按位用于操作位在 char 和 int 数据类型和变量和不在 浮动、double、longdouble，void，bool 或其他)，复杂数据类型。

NOT 按位有实情表和逻辑 NOT 相同，但应用于的单个位上的级别的数据类型。 给定的位 b，~b为true，则 b 是错误和false，如果 b 为true。 逻辑 NOT运算符! 在元素级别上应用，计数为所有非零值，true，结果是valarray布尔值。 除了0或1，按位 NOToperator~，相反，可以按位导致valarray值，具体取决于操作的结果。

示例

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

int main( )
{
   using namespace std;
   int i;

   valarray<unsigned short int> vaL1 ( 10 );
   valarray<unsigned short int> vaNOT1 ( 10 );
   for ( i = 0 ; i < 10 ; i += 2 )
      vaL1 [ i ] =  i;
   for ( i = 1 ; i < 10 ; i += 2 )
      vaL1 [ i ] =  5*i;
   
   cout << "The initial valarray <unsigned short int> is:  ( ";
      for ( i = 0 ; i < 10 ; i++ )
         cout << vaL1 [ i ] << " ";
   cout << ")." << endl;

   vaNOT1 = ~vaL1;
   cout << "The element-by-element result of "
        << "the bitwise NOT operator~ is the\n valarray: ( ";
      for ( i = 0 ; i < 10 ; i++ )
         cout << vaNOT1 [ i ] << " ";
   cout << ")." << endl << endl;

   valarray<int> vaL2 ( 10 );
   valarray<int> vaNOT2 ( 10 );
   for ( i = 0 ; i < 10 ; i += 2 )
      vaL2 [ i ] =  i;
   for ( i = 1 ; i < 10 ; i += 2 )
      vaL2 [ i ] =  -2 * i;
   
   cout << "The initial valarray <int> is:  ( ";
      for ( i = 0 ; i < 10 ; i++ )
         cout << vaL2 [ i ] << " ";
   cout << ")." << endl;

   vaNOT2 = ~vaL2;
   cout << "The element-by-element result of "
        << "the bitwise NOT operator~ is the\n valarray: ( ";
      for ( i = 0 ; i < 10 ; i++ )
         cout << vaNOT2 [ i ] << " ";
   cout << ")." << endl;

   // The negative numbers are represented using
   // the two's complement approach, so adding one
   // to the flipped bits returns the negative elements
   vaNOT2 = vaNOT2 + 1;
   cout << "The element-by-element result of "
        << "adding one\n is the negative of the "
        << "original elements the\n valarray: ( ";
      for ( i = 0 ; i < 10 ; i++ )
         cout << vaNOT2 [ i ] << " ";
   cout << ")." << endl;
}

要求

标头: <valarray>

命名空间: std

请参见

参考

valarray Class