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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
namespace vespalib::datastore {
/*
* Helper class for normalizing values inserted into unique store.
*/
template <typename EntryT>
class UniqueStoreValueFilter {
public:
static const EntryT &filter(const EntryT &value) {
return value;
}
};
/*
* Specialized helper class for normalizing floating point values
* inserted into unique store. Any type of NAN is normalized to a
* specific one.
*/
template <typename EntryT>
class UniqueStoreFloatingPointValueFilter {
static const EntryT normalized_nan;
public:
static const EntryT &filter(const EntryT &value) {
return std::isnan(value) ? normalized_nan : value;
}
};
template <typename EntryT>
const EntryT UniqueStoreFloatingPointValueFilter<EntryT>::normalized_nan = -std::numeric_limits<EntryT>::quiet_NaN();
/*
* Specialized helper class for normalizing float values inserted into unique store.
* Any type of NAN is normalized to a specific one.
*/
template <>
class UniqueStoreValueFilter<float> : public UniqueStoreFloatingPointValueFilter<float> {
};
/*
* Specialized helper class for normalizing double values inserted into unique store.
* Any type of NAN is normalized to a specific one.
*/
template <>
class UniqueStoreValueFilter<double> : public UniqueStoreFloatingPointValueFilter<double> {
};
}
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