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once_alloc.h

gehe zur Dokumentation dieser Datei

#ifndef ONCE_ALLOC_H
#define ONCE_ALLOC_H
#include"rpointer.h"
#include"growingmseg.h"

namespace RAMS
{
class Oncealloc
{
 protected:
    Growingmseg mseg; 
    RcharPointer akt; 
    RcharPointer ao;  
    long align;       
 public:
    Oncealloc(int ini=1,long a=4):akt(0,&mseg),ao(0,&mseg)
        { mseg.grow(ini); align=a;
        }

    RcharPointer neu()
        { ao.setoff(align2(align,ao.offset()));
          akt=ao;
          return akt;
        }

    RcharPointer aktuell() { return akt; }
    RcharPointer aktende() { return ao; }

    void grow1(char c) throw(Growingmseg::Error)
        {
            if(ao.offset()>=mseg.length()) mseg.grow(1);
            *(ao.ptr())=c;
            ao+=1;
        }

    void garant(int l) throw(Growingmseg::Error) 
        {
            if(ao.offset()+l > mseg.length())
            {
                long al=align2(getpagesize(),l)/getpagesize();
                mseg.grow(al);
            }
        }

    RcharPointer reserve(int l) throw(Growingmseg::Error)
        {
            garant(l);
            ao+=l;
            return akt;
        }

    RcharPointer alloc(int l) throw(Growingmseg::Error)
        {
            neu();
            return reserve(l);
        }

    Mseg *getmseg() { return &mseg; }

    long reallength() const { return ao.offset(); }

    void write2file(char *filename) throw(Systemerror);
};
}
#endif

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