构造函数中的静态变量

#ifndef SELF_SUM_H
#define SELF_SUM_H
#include<iostream>
unsigned int Sum_solution1(int n_value); 
class SumDefaultConstruct{
private:
	static unsigned int countN; 
	static unsigned int sumN; 
public:
	SumDefaultConstruct(){
		countN++; 
		sumN+=countN; 
	}
	static void reSet(){
		countN=0; 
		sumN=0; 
	}
	static unsigned int getSum(){
		return sumN; 
	}
}; 
unsigned int SumDefaultConstruct::countN=0;
unsigned int SumDefaultConstruct::sumN=0; 
unsigned int Sum_solution1(int n_value){
	if(n_value==0){
		return 0; 
	}
	SumDefaultConstruct::reSet(); 
	SumDefaultConstruct *ptr=new SumDefaultConstruct[n_value]; 
	delete[] ptr; 
	ptr=NULL; 
	return SumDefaultConstruct::getSum(); 
}
#endif