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#ifndef STREAM_BASE_INCLUDED
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#define STREAM_BASE_INCLUDED
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namespace mystream {
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class stream_base
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{
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public:
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enum state
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{
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goodbit=0,
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failbit=1,
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eofbit=2,
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badbit=4
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};
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enum seek_type{
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seek_begin,
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seek_end,
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seek_current
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};
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struct pos_type;
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struct off_type
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{
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int offset;
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off_type() { offset=0; }
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off_type(const off_type& other) { offset=other.offset; }
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explicit off_type(const pos_type& other) { offset=(int)other.pos; }
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off_type(size_t s) { offset=(int)s; }
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operator long() { return (long) offset; }
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off_type operator -(const off_type& other) const { return (off_type)(offset - other.offset); }
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off_type operator -(int other) const { return (off_type)(offset - other); }
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off_type operator +(const off_type& other) const { return (off_type)(offset + other.offset); }
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off_type operator +(int i) const { return (off_type)(offset + i); }
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off_type operator +=(const off_type& other) { return offset+=other.offset; }
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bool operator ==(const off_type& other) const { return offset==other.offset; }
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};
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typedef off_type offset_type;
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struct pos_type
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{
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size_t pos;
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pos_type() { pos=0; }
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pos_type(const pos_type& other) { pos=other.pos; }
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pos_type(size_t s) { pos=s; }
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offset_type operator -(const pos_type& other) const { return (offset_type)(pos - other.pos); }
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offset_type operator +(const pos_type& other) const { return (offset_type)(pos + other.pos); }
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bool operator ==(const pos_type& other) const { return pos==other.pos; }
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bool operator ==(int i) const { return pos == (size_t)i; }
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operator size_t () const { return (size_t)pos; }
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};
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typedef size_t size_type;
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private:
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int m_state;
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int m_flags;
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public:
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stream_base() { m_flags=0; clear(goodbit); }
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virtual ~stream_base() { }
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void clear(state s) { m_state=s; }
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int setstate(state s)
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{
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int old=m_state;
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m_state|=s;
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return old;
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}
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int rdstate() const { return m_state; }
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bool good() const { return rdstate() == goodbit; }
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bool bad() const { return (rdstate() & badbit) > 0; }
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bool fail() const { return ((rdstate() & (failbit | badbit))!=0); }
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bool eof() const { return (rdstate() & eofbit) > 0; }
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int flags() const { return m_flags; }
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int flags(int newflags)
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{
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int old=m_flags;
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m_flags = newflags;
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return old;
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}
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int setf(int newflags)
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{
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int old=m_flags;
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m_flags|=newflags;
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return old;
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}
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void unsetf(int mask) { m_flags&=~mask; }
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};
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}
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#endif // !defined(STREAM_BASE_INCLUDED)
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