RingBuf.h

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#ifndef VR_BASE_RINGBUF_H
#define VR_BASE_RINGBUF_H
#include "Env.h"
#include <vector>
/** @file RingBuf.h ƒŠƒ“ƒOƒoƒbƒtƒ@(FIFO‚ðŽÀŒ»‚·‚邽‚ß‚ÌŠÂ�óƒoƒbƒtƒ@)ƒNƒ‰ƒX‚Ì’è‹`*/
namespace Spr {


template <class T>
class UTRingBuffer:private std::vector<T>{
public:
    typedef std::vector<T> container;
    typedef std::vector<T> base_class;
protected:
    int cur;
public:
    T zero;
    UTRingBuffer(int sz=0){
        cur = 0;
        size(sz);
    }
    int size() const{ return container::size(); }
    void size(int sz){
        container::resize(sz);
        if (cur >= size()) cur = 0;
    }
    void clear(){
        for(int i=0; i<size(); i++) begin()[i] = zero;
    }
    void inc(){
        cur ++;
        if (cur>=size()) cur = 0;
    }
    void dec(){
        cur --;
        if (cur<0) cur = size()-1;
    }
    T& operator[] (int i){
        i += cur + size();
        i = i % size();
        return begin()[i];
    }
};

}   //  namespace Spr

#endif

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