mirror of https://github.com/ArduPilot/ardupilot
71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
/*
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
/*
|
|
simple bitmask class
|
|
*/
|
|
|
|
class Bitmask {
|
|
public:
|
|
Bitmask(uint16_t numbits) :
|
|
numwords((numbits+31)/32) {
|
|
bits = new uint32_t[numwords];
|
|
}
|
|
~Bitmask(void) {
|
|
delete[] bits;
|
|
}
|
|
|
|
// set given bitnumber
|
|
void set(uint16_t bit) {
|
|
uint16_t word = bit/32;
|
|
uint8_t ofs = bit & 0x1f;
|
|
bits[word] |= (1U << ofs);
|
|
}
|
|
|
|
// clear given bitnumber
|
|
void clear(uint16_t bit) {
|
|
uint16_t word = bit/32;
|
|
uint8_t ofs = bit & 0x1f;
|
|
bits[word] &= ~(1U << ofs);
|
|
}
|
|
|
|
// clear all bits
|
|
void clearall(void) {
|
|
for (uint16_t i=0; i<numwords; i++) {
|
|
bits[i] = 0;
|
|
}
|
|
}
|
|
|
|
// return true if given bitnumber is set
|
|
bool get(uint16_t bit) {
|
|
uint16_t word = bit/32;
|
|
uint8_t ofs = bit & 0x1f;
|
|
return (bits[word] & (1U << ofs)) != 0;
|
|
}
|
|
|
|
// return true if all bits are clear
|
|
bool empty(void) {
|
|
for (uint16_t i=0; i<numwords; i++) {
|
|
if (bits[i] != 0) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
private:
|
|
uint16_t numwords;
|
|
uint32_t *bits;
|
|
};
|