88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
// Copyright 2010-2022 Google LLC
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#ifndef OR_TOOLS_BASE_BITMAP_H_
|
|
#define OR_TOOLS_BASE_BITMAP_H_
|
|
|
|
#include <string.h>
|
|
|
|
#include "ortools/base/basictypes.h"
|
|
|
|
namespace operations_research {
|
|
namespace internal {
|
|
inline uint64_t OneBit64(int pos) { return uint64_t{1} << pos; }
|
|
inline uint64_t BitPos64(uint64_t pos) { return (pos & 63); }
|
|
inline uint64_t BitOffset64(uint64_t pos) { return (pos >> 6); }
|
|
inline uint64_t BitLength64(uint64_t size) { return ((size + 63) >> 6); }
|
|
inline bool IsBitSet64(const uint64_t* const bitset, uint64_t pos) {
|
|
return (bitset[BitOffset64(pos)] & OneBit64(BitPos64(pos)));
|
|
}
|
|
inline void SetBit64(uint64_t* const bitset, uint64_t pos) {
|
|
bitset[BitOffset64(pos)] |= OneBit64(BitPos64(pos));
|
|
}
|
|
inline void ClearBit64(uint64_t* const bitset, uint64_t pos) {
|
|
bitset[BitOffset64(pos)] &= ~OneBit64(BitPos64(pos));
|
|
}
|
|
} // namespace internal
|
|
|
|
class Bitmap {
|
|
public:
|
|
// Constructor : This allocates on a uint32_t boundary.
|
|
// fill: true = initialize with 1's, false = initialize with 0's.
|
|
explicit Bitmap(uint32_t size, bool fill = false)
|
|
: max_size_(size),
|
|
array_size_(internal::BitLength64(size)),
|
|
map_(new uint64_t[array_size_]) {
|
|
// initialize all of the bits
|
|
SetAll(fill);
|
|
}
|
|
|
|
// Destructor: clean up.
|
|
~Bitmap() { delete[] map_; }
|
|
|
|
// Resizes the bitmap.
|
|
// If size < bits(), the extra bits will be discarded.
|
|
// If size > bits(), the extra bits will be filled with the fill value.
|
|
void Resize(uint32_t size, bool fill = false);
|
|
|
|
bool Get(uint32_t index) const {
|
|
assert(max_size_ == 0 || index < max_size_);
|
|
return internal::IsBitSet64(map_, index);
|
|
}
|
|
void Set(uint32_t index, bool value) {
|
|
assert(max_size_ == 0 || index < max_size_);
|
|
if (value) {
|
|
internal::SetBit64(map_, index);
|
|
} else {
|
|
internal::ClearBit64(map_, index);
|
|
}
|
|
}
|
|
|
|
// Sets all the bits to true or false
|
|
void SetAll(bool value) {
|
|
memset(map_, (value ? 0xFF : 0x00), array_size_ * sizeof(*map_));
|
|
}
|
|
|
|
// Clears all bits in the bitmap
|
|
void Clear() { SetAll(false); }
|
|
|
|
private:
|
|
uint32_t max_size_; // the upper bound of the bitmap
|
|
uint32_t array_size_;
|
|
uint64_t* map_; // the bitmap
|
|
};
|
|
|
|
} // namespace operations_research
|
|
|
|
#endif // OR_TOOLS_BASE_BITMAP_H_
|