bitmaps.h

#ifndef WREPORT_BULLETIN_BITMAPS_H
#define WREPORT_BULLETIN_BITMAPS_H
 
#include <wreport/var.h>
#include <vector>
 
namespace wreport {
struct Var;
struct Subset;
 
namespace bulletin {
 
struct Bitmap
{
    Var bitmap;
 
    std::vector<unsigned> refs;
 
    std::vector<unsigned>::const_reverse_iterator iter;
 
    Bitmap(const Var& bitmap, const Subset& subset, unsigned anchor);
    Bitmap(const Var& bitmap, const Subset& subset);
    Bitmap(const Bitmap&) = delete;
    ~Bitmap();
    Bitmap& operator=(const Bitmap&) = delete;
 
    bool eob() const;
 
    unsigned next();
 
    void reuse();
};
 
struct Bitmaps
{
    Varcode pending_definitions = 0;
 
    Bitmap* current = nullptr;
 
    Bitmap* last = nullptr;
 
 
    Bitmaps() {}
    Bitmaps(const Bitmaps&) = delete;
    ~Bitmaps();
    Bitmaps& operator=(const Bitmaps&) = delete;
 
    void define(const Var& bitmap, const Subset& subset);
    void define(const Var& bitmap, const Subset& subset, unsigned anchor_point);
 
    void reuse_last();
 
    void discard_last();
 
    unsigned next();
 
    bool active() const { return (bool)current; }
};
 
}
}
#endif