, , . , , -, , -.
std::transform , ( !) . . , std::plus.
:
#include <vector>
#include <iostream>
#include <iterator>
#include <algorithm>
//
template < typename InputIt >
void printCollection (InputIt _first, InputIt _last, const char * _prefix)
{
std::cout << _prefix;
while (_first!= _last)
{
std::cout << * _first << ' ';
++ _first;
}
std::cout << std::endl;
}
int main ()
{
//
std::vector< double > vX, vY;
for (int i = 0; i < 10; i++)
{
vX.push_back(i);
vY.push_back(i * 2);
}
//
std::vector< double > vR;
//
// vR[ i ] = vX[ i ] + vY[ i ]
std::transform(
vX.begin(), vX.end(), vY.begin(),
std::back_inserter(vR),
std::plus< double >()
);
//
printCollection(vX.begin(), vX.end(), "X: ");
printCollection(vY.begin(), vY.end(), "Y: ");
printCollection(vR.begin(), vR.end(), "R: ");
}
:
std::plus . ++ :
| + | std::plus |
| - () | std::minus |
| - () | std::negates |
| * | std::multiplies |
| / | std::divides |
| % | std::modulus |
| == | std::equal_to |
| != | std::not_equal_to |
| < | std::less |
| > | std::greater |
| <= | std::less_equal |
| >= | std::greater_equal |
| && | std::logical_and |
| || | std::logical_or |
| ! | std::logical_not |
| & | std::bit_and |
| | | std::bit_or |
| ^ | std::bit_xor |
| ~ | std::bit_not |
std::bind
- , , ( 2, 3). , . .
|
|
|
, (binder), . ++11 , ++11 std::bind ( <functional>). , , .
, , 2:
#include <functional>
#include <iostream>
#include <vector>
#include <algorithm>
//
bool dividesOn (int x, int N)
{
return (x % N) == 0;
}
int main ()
{
//
std::vector< int > v;
for (int i = 0; i < 10; i++)
v.push_back(i);
// , 2
std::cout
<< std::count_if(
v.begin(), v.end(), //
//
std::bind(
//
std::logical_not< bool >(),
// : 2
std::bind(& dividesOn, std::placeholders::_1, 2)
)
)
<< std::endl;
}
. , ( ), , , :
std::bind(& dividesOn, std::placeholders::_1, 2)
std::placeholders::_1 () , . - , . , std::placeholders::_1, std::placeholders::_2 , .
, :
struct binder_temp_functor
{
