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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "allocatedbitvector.h"
#include <vespa/vespalib/util/atomic.h>
#include <vespa/vespalib/util/generationholder.h>
namespace search {
class GrowableBitVector
{
public:
using Alloc = vespalib::alloc::Alloc;
using GenerationHolder = vespalib::GenerationHolder;
using GenerationHeldBase = vespalib::GenerationHeldBase;
GrowableBitVector(BitWord::Index newSize, BitWord::Index newCapacity,
GenerationHolder &generationHolder, const Alloc *init_alloc = nullptr);
const BitVector &reader() const { return acquire_self(); }
AllocatedBitVector &writer() { return *_stored; }
BitWord::Index extraByteSize() const {
return sizeof(AllocatedBitVector) + acquire_self().extraByteSize();
}
/** Will return true if a a buffer is held */
bool reserve(BitWord::Index newCapacity);
bool shrink(BitWord::Index newCapacity);
bool extend(BitWord::Index newCapacity);
private:
GenerationHeldBase::UP grow(BitWord::Index newLength, BitWord::Index newCapacity);
AllocatedBitVector &acquire_self() const { return *(_self.load(std::memory_order_acquire)); }
VESPA_DLL_LOCAL bool hold(GenerationHeldBase::UP v);
std::unique_ptr<AllocatedBitVector> _stored;
std::atomic<AllocatedBitVector *> _self;
GenerationHolder &_generationHolder;
};
} // namespace search
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