00001 //Owner: Fred 00002 //$$ controlw.h Control word class 00003 00004 #ifndef CONTROL_WORD_LIB 00005 #define CONTROL_WORD_LIB 0 00006 00007 // for organising an int as a series of bits which indicate whether an 00008 // option is on or off. 00009 00012 class ControlWord { 00013 protected: 00014 int cw; // the control word 00015 public: 00016 ControlWord() : cw(0) { // do nothing 00017 } 00018 ControlWord(int i) : cw(i) { // load an integer 00019 } 00020 00021 // select specific bits (for testing at least one set) 00022 ControlWord operator*(ControlWord i) const 00023 { return ControlWord(cw & i.cw); } 00024 void operator*=(ControlWord i) { cw &= i.cw; } 00025 00026 // set bits 00027 ControlWord operator+(ControlWord i) const 00028 { return ControlWord(cw | i.cw); } 00029 void operator+=(ControlWord i) { cw |= i.cw; } 00030 00031 // reset bits 00032 ControlWord operator-(ControlWord i) const 00033 { return ControlWord(cw - (cw & i.cw)); } 00034 void operator-=(ControlWord i) { cw -= (cw & i.cw); } 00035 00036 // check if all of selected bits set or reset 00037 bool operator>=(ControlWord i) const { return (cw & i.cw) == i.cw; } 00038 bool operator<=(ControlWord i) const { return (cw & i.cw) == cw; } 00039 00040 // flip selected bits 00041 ControlWord operator^(ControlWord i) const 00042 { return ControlWord(cw ^ i.cw); } 00043 ControlWord operator~() const { return ControlWord(~cw); } 00044 00045 // convert to integer 00046 int operator+() const { return cw; } 00047 int operator!() const { return cw==0; } 00048 FREE_CHECK(ControlWord) 00049 }; 00050 #endif
