valarray::operator~
位元取得每個項目的 NOT 值。valarray 的一元 (Unary) 運算子。
valarray<Type> operator~( ) const;
傳回值
位元欄位就是運算元中的項目值 NOT valarray valarray 的布林值。
備註
作業只能位元作業中使用位元 char 和 int 資料型別和變數和不在 float、 double、 longdouble, void, bool ),更複雜的資料型別。
NOT 具備位元的事實資料表和邏輯 NOT 相同,但適用於對兩個數值層級上的資料型別。 所指定的位元 b, ~b 為 True,如果 b 屬於錯誤和錯誤的,如果 b 則為 true。 邏輯 NOT運算子! 項目層級上套用,計算為任何非零的值, true,而結果是 valarray 布林值。 除了之外, 0 或 1 位元 NOToperator~,相較之下,可能會導致 valarray 位元值,根據作業的結果。
範例
// 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;
}
需求
標題: <valarray>
命名空間: std