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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 <cmath>
#include <limits>
#include <vespa/vespalib/stllike/string.h>
namespace search::attribute {
// for all integers
template <typename T>
constexpr T getUndefined() {
return std::numeric_limits<T>::min();
}
template <>
inline constexpr float getUndefined<float>() {
return -std::numeric_limits<float>::quiet_NaN();
}
template <>
inline constexpr double getUndefined<double>() {
return -std::numeric_limits<double>::quiet_NaN();
}
template <>
inline constexpr const char* getUndefined<const char*>() {
return "";
}
// for all signed integers
template <typename T>
bool isUndefined(const T & value) {
return value == getUndefined<T>();
}
template <>
inline bool isUndefined<uint8_t>(const uint8_t &) {
return false;
}
template <>
inline bool isUndefined<uint16_t>(const uint16_t &) {
return false;
}
template <>
inline bool isUndefined<uint32_t>(const uint32_t &) {
return false;
}
template <>
inline bool isUndefined<uint64_t>(const uint64_t &) {
return false;
}
template <>
inline bool isUndefined<float>(const float & value) {
return std::isnan(value);
}
template <>
inline bool isUndefined<double>(const double & value) {
return std::isnan(value);
}
template <>
inline bool isUndefined<vespalib::string>(const vespalib::string & value) {
return value.empty();
}
}
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