plus Struct
結構提供執行加法算術運算中指定之實值型別的元素之預先定義的函式物件。
template<class Type>
struct plus : public binary_function <Type, Type, Type>
{
Type operator()(
const Type& _Left,
const Type& _Right
) const;
};
參數
_Left
為參數型別 [型別] 由函式加入物件的數目。_Right
為參數型別 [型別] 由函式加入物件的數目。
傳回值
總和 _Left + _Right。
範例
// functional_plus.cpp
// compile with: /EHsc
#include <vector>
#include <functional>
#include <algorithm>
#include <iostream>
using namespace std;
int main( )
{
vector <double> v1, v2, v3 ( 6 );
vector <double>::iterator Iter1, Iter2, Iter3;
int i;
for ( i = 0 ; i <= 5 ; i++ )
v1.push_back( 4 * i );
int j;
for ( j = 0 ; j <= 5 ; j++ )
v2.push_back( -2.0 * j - 4 );
cout << "The vector v1 = ( " ;
for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
cout << *Iter1 << " ";
cout << ")" << endl;
cout << "The vector v2 = ( " ;
for ( Iter2 = v2.begin( ) ; Iter2 != v2.end( ) ; Iter2++ )
cout << *Iter2 << " ";
cout << ")" << endl;
// Finding the element-wise sums of the elements of v1 & v2
transform (v1.begin( ), v1.end( ), v2.begin( ), v3.begin ( ), plus<double>( ) );
cout << "The element-wise sums are: ( " ;
for ( Iter3 = v3.begin( ) ; Iter3 != v3.end( ) ; Iter3++ )
cout << *Iter3 << " ";
cout << ")" << endl;
}
需求
標題: <functional>
命名空間: std