3dpcp/.svn/pristine/04/043043909f8c45ae2b4eb378a7d71a101aeec304.svn-base

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2012-09-16 12:33:11 +00:00
//$$ controlw.h Control word class
#ifndef CONTROL_WORD_LIB
#define CONTROL_WORD_LIB 0
// for organising an int as a series of bits which indicate whether an
// option is on or off.
class ControlWord
{
protected:
int cw; // the control word
public:
ControlWord() : cw(0) {} // do nothing
ControlWord(int i) : cw(i) {} // load an integer
// select specific bits (for testing at least one set)
ControlWord operator*(ControlWord i) const
{ return ControlWord(cw & i.cw); }
void operator*=(ControlWord i) { cw &= i.cw; }
// set bits
ControlWord operator+(ControlWord i) const
{ return ControlWord(cw | i.cw); }
void operator+=(ControlWord i) { cw |= i.cw; }
// reset bits
ControlWord operator-(ControlWord i) const
{ return ControlWord(cw - (cw & i.cw)); }
void operator-=(ControlWord i) { cw -= (cw & i.cw); }
// check if all of selected bits set or reset
bool operator>=(ControlWord i) const { return (cw & i.cw) == i.cw; }
bool operator<=(ControlWord i) const { return (cw & i.cw) == cw; }
// flip selected bits
ControlWord operator^(ControlWord i) const
{ return ControlWord(cw ^ i.cw); }
ControlWord operator~() const { return ControlWord(~cw); }
// convert to integer
int operator+() const { return cw; }
int operator!() const { return cw==0; }
FREE_CHECK(ControlWord)
};
#endif