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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/objects/nbo.h>
#include <functional>
#include <limits>
#include <algorithm>
namespace vespalib {
template<typename T, bool asc=true>
class convertForSort
{
};
template<>
class convertForSort<float, true>
{
public:
typedef float InputType;
typedef int32_t IntType;
typedef uint32_t UIntType;
typedef std::less<InputType> Compare;
static inline UIntType convert(float value)
{
union { float f; UIntType u; } val;
val.f=value;
return (static_cast<IntType>(val.u) >= 0)
? (val.u ^ (UIntType(std::numeric_limits<IntType>::max()) + 1))
: (val.u ^ std::numeric_limits<UIntType>::max());
}
};
template<>
class convertForSort<float, false>
{
public:
typedef float InputType;
typedef int32_t IntType;
typedef uint32_t UIntType;
typedef std::greater<InputType> Compare;
static inline UIntType convert(float value)
{
union { float f; UIntType u; } val;
val.f=value;
return (static_cast<IntType>(val.u) >= 0)
? (val.u ^ std::numeric_limits<IntType>::max())
: val.u;
}
};
template<>
class convertForSort<double, true>
{
public:
typedef double InputType;
typedef int64_t IntType;
typedef uint64_t UIntType;
typedef std::less<InputType> Compare;
static inline UIntType convert(double value)
{
union { double f; UIntType u; } val;
val.f=value;
return (static_cast<IntType>(val.u) >= 0)
? (val.u ^ (UIntType(std::numeric_limits<IntType>::max()) + 1))
: (val.u ^ std::numeric_limits<UIntType>::max());
}
};
template<>
class convertForSort<double, false>
{
public:
typedef double InputType;
typedef int64_t IntType;
typedef uint64_t UIntType;
typedef std::greater<InputType> Compare;
static inline UIntType convert(double value)
{
union { double f; UIntType u; } val;
val.f=value;
return (static_cast<IntType>(val.u) >= 0)
? (val.u ^ std::numeric_limits<IntType>::max())
: val.u;
}
};
template<>
class convertForSort<uint8_t, true>
{
public:
typedef uint8_t InputType;
typedef int8_t IntType;
typedef uint8_t UIntType;
typedef std::less<InputType> Compare;
static inline UIntType convert(UIntType value) { return value; }
};
template<>
class convertForSort<uint8_t, false>
{
public:
typedef uint8_t InputType;
typedef int8_t IntType;
typedef uint8_t UIntType;
typedef std::greater<InputType> Compare;
static inline UIntType convert(UIntType value) { return ~value; }
};
template<>
class convertForSort<uint16_t, true>
{
public:
typedef uint16_t InputType;
typedef int16_t IntType;
typedef uint16_t UIntType;
typedef std::less<InputType> Compare;
static inline UIntType convert(UIntType value) { return value; }
};
template<>
class convertForSort<uint16_t, false>
{
public:
typedef uint16_t InputType;
typedef int16_t IntType;
typedef uint16_t UIntType;
typedef std::greater<InputType> Compare;
static inline UIntType convert(UIntType value) { return ~value; }
};
template<>
class convertForSort<uint32_t, true>
{
public:
typedef uint32_t InputType;
typedef int32_t IntType;
typedef uint32_t UIntType;
typedef std::less<InputType> Compare;
static inline UIntType convert(UIntType value) { return value; }
};
template<>
class convertForSort<uint32_t, false>
{
public:
typedef uint32_t InputType;
typedef int32_t IntType;
typedef uint32_t UIntType;
typedef std::greater<InputType> Compare;
static inline UIntType convert(UIntType value) { return ~value; }
};
template<>
class convertForSort<uint64_t, true>
{
public:
typedef uint64_t InputType;
typedef int64_t IntType;
typedef uint64_t UIntType;
typedef std::less<InputType> Compare;
static inline UIntType convert(UIntType value) { return value; }
};
template<>
class convertForSort<uint64_t, false>
{
public:
typedef uint64_t InputType;
typedef int64_t IntType;
typedef uint64_t UIntType;
typedef std::greater<InputType> Compare;
static inline UIntType convert(UIntType value) { return ~value; }
};
template<>
class convertForSort<int8_t, true>
{
public:
typedef int8_t InputType;
typedef int8_t IntType;
typedef uint8_t UIntType;
typedef std::less<InputType> Compare;
static inline UIntType convert(IntType value) { return value ^ (std::numeric_limits<IntType>::max() + 1); }
};
template<>
class convertForSort<int8_t, false>
{
public:
typedef int8_t InputType;
typedef int8_t IntType;
typedef uint8_t UIntType;
typedef std::greater<InputType> Compare;
static inline UIntType convert(IntType value) { return value ^ std::numeric_limits<IntType>::max(); }
};
template<>
class convertForSort<int16_t, true>
{
public:
typedef int16_t InputType;
typedef int16_t IntType;
typedef uint16_t UIntType;
typedef std::less<InputType> Compare;
static inline UIntType convert(IntType value) { return value ^ (std::numeric_limits<IntType>::max() + 1); }
};
template<>
class convertForSort<int16_t, false>
{
public:
typedef int16_t InputType;
typedef int16_t IntType;
typedef uint16_t UIntType;
typedef std::greater<InputType> Compare;
static inline UIntType convert(IntType value) { return value ^ std::numeric_limits<IntType>::max(); }
};
template<>
class convertForSort<int32_t, true>
{
public:
typedef int32_t InputType;
typedef int32_t IntType;
typedef uint32_t UIntType;
typedef std::less<InputType> Compare;
static inline UIntType convert(IntType value) { return value ^ (UIntType(std::numeric_limits<IntType>::max()) + 1); }
};
template<>
class convertForSort<int32_t, false>
{
public:
typedef int32_t InputType;
typedef int32_t IntType;
typedef uint32_t UIntType;
typedef std::greater<InputType> Compare;
static inline UIntType convert(IntType value) { return value ^ std::numeric_limits<IntType>::max(); }
};
template<>
class convertForSort<int64_t, true>
{
public:
typedef int64_t InputType;
typedef int64_t IntType;
typedef uint64_t UIntType;
typedef std::less<InputType> Compare;
static inline UIntType convert(IntType value) { return value ^ (UIntType(std::numeric_limits<IntType>::max()) + 1); }
};
template<>
class convertForSort<int64_t, false>
{
public:
typedef int64_t InputType;
typedef int64_t IntType;
typedef uint64_t UIntType;
typedef std::greater<InputType> Compare;
static inline UIntType convert(IntType value) { return value ^ std::numeric_limits<IntType>::max(); }
};
template<typename C>
uint32_t serializeForSort(typename C::InputType v, void * dst) {
typename C::UIntType nbo(vespalib::nbo::n2h(C::convert(v)));
memcpy(dst, &nbo, sizeof(nbo));
return sizeof(nbo);
}
} // namespace vespalib
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