49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
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//$$ controlw.h Control word class
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#ifndef CONTROL_WORD_LIB
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#define CONTROL_WORD_LIB 0
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// for organising an int as a series of bits which indicate whether an
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// option is on or off.
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class ControlWord
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{
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protected:
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int cw; // the control word
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public:
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ControlWord() : cw(0) {} // do nothing
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ControlWord(int i) : cw(i) {} // load an integer
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// select specific bits (for testing at least one set)
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ControlWord operator*(ControlWord i) const
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{ return ControlWord(cw & i.cw); }
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void operator*=(ControlWord i) { cw &= i.cw; }
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// set bits
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ControlWord operator+(ControlWord i) const
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{ return ControlWord(cw | i.cw); }
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void operator+=(ControlWord i) { cw |= i.cw; }
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// reset bits
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ControlWord operator-(ControlWord i) const
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{ return ControlWord(cw - (cw & i.cw)); }
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void operator-=(ControlWord i) { cw -= (cw & i.cw); }
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// check if all of selected bits set or reset
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bool operator>=(ControlWord i) const { return (cw & i.cw) == i.cw; }
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bool operator<=(ControlWord i) const { return (cw & i.cw) == cw; }
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// flip selected bits
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ControlWord operator^(ControlWord i) const
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{ return ControlWord(cw ^ i.cw); }
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ControlWord operator~() const { return ControlWord(~cw); }
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// convert to integer
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int operator+() const { return cw; }
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int operator!() const { return cw==0; }
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FREE_CHECK(ControlWord)
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};
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#endif
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