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/usr/include/bobcat/ofoldstream is in libbobcat-dev 3.23.01-1.

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#ifndef INCLUDED_BOBCAT_OFOLDSTREAM_
#define INCLUDED_BOBCAT_OFOLDSTREAM_

#include <ostream>
#include <fstream>

#include <bobcat/ofoldstreambuf>

namespace FBB
{

    // 'virtual public OFoldStreambufBlanks is used to avoid 'base class not
    // accessible' warnings since OFoldStreambuf also inherits from
    // OFoldStreambufBlanks and only one struct definition is needed in the
    // final OFoldStream class.
class OFoldStream: virtual public OFoldStreambufEnums, 
                   private OFoldStreambuf, public std::ostream
{
    public:
        OFoldStream()           = default;

        explicit OFoldStream(char const *fname,                     // 1.f
                    size_t leftIndent = 0, size_t rightMargin = 80,
                    TabsOrBlanks tob = BLANKS,
                    TrailingBlanks tb = IGNORE_TRAILING_BLANKS);

        explicit OFoldStream(std::ostream &dest,                    // 2.f
                    size_t leftIndent = 0, size_t rightMargin = 80,
                    TabsOrBlanks tob = BLANKS,
                    TrailingBlanks tb = IGNORE_TRAILING_BLANKS);

        void open(char const *fname,
                  size_t leftIndent = 0, size_t rightMargin = 80,
                  TrailingBlanks tb = IGNORE_TRAILING_BLANKS);

        void open(std::ostream &out,
                  size_t leftIndent = 0, size_t rightMargin = 80,
                  TrailingBlanks tb = IGNORE_TRAILING_BLANKS);

        void close();                                               // .f

        void setMargins(size_t leftMargin, size_t rightMargin);     // .f
        void setTrailingBlanks(TrailingBlanks tb);                  // .f
        void useBlanks();                                           // .f
        void useTabs(size_t tabWidth = 8);                          // .f

        static size_t leftMargin(std::ostream const &os);           // .f
        static size_t rightMargin(std::ostream const &os);          // .f
};

inline OFoldStream::OFoldStream(char const *fname, 
                    size_t leftIndent, size_t rightMargin, 
                    TabsOrBlanks tob, TrailingBlanks tb)
:
    OFoldStreambuf(fname, leftIndent, rightMargin, tob, tb),
    std::ostream(this)
{}
inline OFoldStream::OFoldStream(std::ostream &out, 
                    size_t leftIndent, size_t rightMargin, 
                    TabsOrBlanks tob, TrailingBlanks tb)
:
    OFoldStreambuf(out, leftIndent, rightMargin, tob, tb),
    std::ostream(this)
{}

inline void OFoldStream::close()
{
    OFoldStreambuf::close();
}
inline size_t OFoldStream::leftMargin(std::ostream const &os)
{
    return OFoldStreambuf::leftMargin(os.rdbuf());
}
inline size_t OFoldStream::rightMargin(std::ostream const &os)
{
    return OFoldStreambuf::rightMargin(os.rdbuf());
}
inline void OFoldStream::setMargins(size_t lm, size_t rm)
{
    OFoldStreambuf::setMargins(lm, rm);
}
inline void OFoldStream::setTrailingBlanks(TrailingBlanks tb)
{
    OFoldStreambuf::setTrailingBlanks(tb);
}
inline void OFoldStream::useBlanks()
{
    OFoldStreambuf::useBlanks();
}
inline void OFoldStream::useTabs(size_t tabWidth)
{
    OFoldStreambuf::useTabs(tabWidth);
}

} // FBB

#endif