学步园

return *this;inline bool floatEq(float a, float b){
	float c=a-b;
	if(c>1e-5 || c<-1e-5){
		return false;
	}
	return true;
}

class Range{
	float	max_;
	float 	min_;
	float 	step_;
	float 	current_;
public:
	class iterator{
		const Range& r_;
		float v;
	public:
		explicit iterator(const Range& r):r_(r){}
		inline iterator&    operator++(){
			v += r_.step_;
                        return *this;
		}
	    inline float operator*() const{ return v; };
	    inline bool operator== (const iterator& rhs) const{
	    	return floatEq(rhs.v,v);
	    }
	    inline bool operator!= (const iterator& rhs) const{
	    	return !(floatEq(rhs.v,v));
	    }
	    inline void setValue(float value){ v=value; }
	};

public:
	Range(){}
	Range(float max, float min, int steps){
		if(max>min){
			max_=max;
			min_=min;
		}else{
			max_=min;
			min_=max;
		}
		step_ = (max_-min_)/(float)(steps);
		current_ = min_;
	};
	inline float	round(const float& v)const{
		float vv;
		if(v>max_)	vv=max_;
		else if(v<min_)	vv=min_;
		else{
			int cc=round_c((v-min_)/step_);
			vv = min_+cc*step_;
		}
		return vv;
	}

	inline iterator begin()const{
		iterator it(*this);
		it.setValue(min_);
		return it;
	}
	inline iterator end()const{
		iterator it(*this);
		it.setValue(max_);
		return it;
	}


	inline float current()const{ return current_; }
	inline void setCurrent(float v){ current_=round(v); }
};




上面是一段代码用于定义范围参数，并提供了iterator 方便遍历。