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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "gencnt.h"
#include <cassert>
namespace vespalib {
GenCnt &
GenCnt::add(uint32_t n)
{
uint32_t newVal = _val + n;
if (newVal < _val) {
// avoid wrap-around to 0
newVal++;
}
_val = newVal;
return *this;
}
bool
GenCnt::inRangeInclusive(GenCnt a, GenCnt b) const
{
if (_val == 0) {
return (a._val == 0);
}
if (b._val >= a._val) {
// a--------------|
// |-------------b
// |------|
return ((_val >= a._val) && (_val <= b._val));
} else {
// a-------|
// |------b
// |------| |-------|
return ((_val >= a._val) || (_val <= b._val));
}
}
uint32_t
GenCnt::distance(const GenCnt &other) const
{
if (other._val == 0) {
// special case
assert(_val == 0);
return 0;
}
if (_val <= other._val) {
// normal case
return (other._val - _val);
}
// wrapped case
return (other._val - _val - 1);
}
GenCnt &
GenCnt::operator=(const GenCnt &src)
{
_val = src.getAsInt();
return *this;
}
} // namespace vespalib
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