距某点最近的算法实现

#include <math.h>
double dist(double i1, double i2)
{
	return fabs(i1-i2);

}

int main() 
{

	vector<double> iv;
	iv.push_back(1);
	iv.push_back(2);
	iv.push_back(3);
	iv.push_back(4.9);
	iv.push_back(6);
	iv.push_back(7);
	iv.push_back(8);



	double i = *min_element(	iv.begin(),
							iv.end(),
							bind(	less<double>(),
									bind(&dist,_1,5.0),
									bind(&dist,_2,5.0)
								)
						);

	cout<<"min is "<<i<<endl;