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#ifndef GENERS_COLUMNBUFFER_HH_
#define GENERS_COLUMNBUFFER_HH_
#include <iostream>
#include <vector>
#include "Alignment/Geners/interface/CharBuffer.hh"
#include "Alignment/Geners/interface/ClassId.hh"
namespace gs {
namespace Private {
struct ColumnBuffer {
inline ColumnBuffer() : firstrow(0), lastrowp1(0), podsize(0) {}
// The actual buffer
CharBuffer buf;
// The range of rows stored in the buffer is [firstrow, lastrowp1)
unsigned long firstrow;
unsigned long lastrowp1;
// The following member will be non-0 if the column
// members are PODs for I/O purposes
unsigned long podsize;
// If the above member is 0, objects in the buffer may have
// variable size. Because of this, we need to store an offset
// of each object separately. To conserve space, the vector
// of object offsets is not filled for PODs.
std::vector<std::streampos> offsets;
// Methods related to I/O
bool write(std::ostream &os) const;
inline const ClassId &classId() const { return static_classId(); }
// The "restore" method is special and requires
// use of special references. The reason is the
// following: we will likely store a large number
// of these buffers at a time. Storing the class id
// of CharBuffer every time would be a waste of
// storage space. Because of this, we will assume
// that the code that manages these buffers will
// stash the CharBuffer class id somewhere.
static void restore(const ClassId &id, const ClassId &charBufId, std::istream &in, ColumnBuffer *buf);
static inline const char *classname() { return "gs::Private::ColumnBuffer"; }
static inline unsigned version() { return 1; }
bool operator==(const ColumnBuffer &r) const;
inline bool operator!=(const ColumnBuffer &r) const { return !(*this == r); }
private:
static const ClassId &static_classId();
};
} // namespace Private
} // namespace gs
#endif // GENERS_COLUMNBUFFER_HH_
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