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Decimal.h
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/
Decimal.h
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#pragma once
#include <base/extended_types.h>
#include <base/Decimal_fwd.h>
#include <base/types.h>
#include <base/defines.h>
namespace DB
{
template <class> struct Decimal;
class DateTime64;
#define FOR_EACH_UNDERLYING_DECIMAL_TYPE(M) \
M(Int32) \
M(Int64) \
M(Int128) \
M(Int256)
#define FOR_EACH_UNDERLYING_DECIMAL_TYPE_PASS(M, X) \
M(Int32, X) \
M(Int64, X) \
M(Int128, X) \
M(Int256, X)
using Decimal32 = Decimal<Int32>;
using Decimal64 = Decimal<Int64>;
using Decimal128 = Decimal<Int128>;
using Decimal256 = Decimal<Int256>;
template <class T> struct NativeTypeT { using Type = T; };
template <is_decimal T> struct NativeTypeT<T> { using Type = typename T::NativeType; };
template <class T> using NativeType = typename NativeTypeT<T>::Type;
/// Own FieldType for Decimal.
/// It is only a "storage" for decimal.
/// To perform operations, you also have to provide a scale (number of digits after point).
template <typename T>
struct Decimal
{
using NativeType = T;
constexpr Decimal() = default;
constexpr Decimal(Decimal<T> &&) noexcept = default;
constexpr Decimal(const Decimal<T> &) = default;
constexpr Decimal(const T & value_): value(value_) {} // NOLINT(google-explicit-constructor)
template <typename U>
constexpr Decimal(const Decimal<U> & x): value(x.value) {} // NOLINT(google-explicit-constructor)
constexpr Decimal<T> & operator=(Decimal<T> &&) noexcept = default;
constexpr Decimal<T> & operator = (const Decimal<T> &) = default;
constexpr operator T () const { return value; } // NOLINT(google-explicit-constructor)
template <typename U>
constexpr U convertTo() const
{
if constexpr (is_decimal<U>)
return convertTo<typename U::NativeType>();
else
return static_cast<U>(value);
}
const Decimal<T> & operator += (const T & x);
const Decimal<T> & operator -= (const T & x);
const Decimal<T> & operator *= (const T & x);
const Decimal<T> & operator /= (const T & x);
const Decimal<T> & operator %= (const T & x);
template <typename U> const Decimal<T> & operator += (const Decimal<U> & x);
template <typename U> const Decimal<T> & operator -= (const Decimal<U> & x);
template <typename U> const Decimal<T> & operator *= (const Decimal<U> & x);
template <typename U> const Decimal<T> & operator /= (const Decimal<U> & x);
template <typename U> const Decimal<T> & operator %= (const Decimal<U> & x);
/// This is to avoid UB for sumWithOverflow()
void NO_SANITIZE_UNDEFINED addOverflow(const T & x);
T value;
};
#define DISPATCH(TYPE) extern template struct Decimal<TYPE>;
FOR_EACH_UNDERLYING_DECIMAL_TYPE(DISPATCH)
#undef DISPATCH
#define DISPATCH(TYPE_T, TYPE_U) \
extern template const Decimal<TYPE_T> & Decimal<TYPE_T>::operator += (const Decimal<TYPE_U> & x); \
extern template const Decimal<TYPE_T> & Decimal<TYPE_T>::operator -= (const Decimal<TYPE_U> & x); \
extern template const Decimal<TYPE_T> & Decimal<TYPE_T>::operator *= (const Decimal<TYPE_U> & x); \
extern template const Decimal<TYPE_T> & Decimal<TYPE_T>::operator /= (const Decimal<TYPE_U> & x); \
extern template const Decimal<TYPE_T> & Decimal<TYPE_T>::operator %= (const Decimal<TYPE_U> & x);
#define INVOKE(X) FOR_EACH_UNDERLYING_DECIMAL_TYPE_PASS(DISPATCH, X)
FOR_EACH_UNDERLYING_DECIMAL_TYPE(INVOKE);
#undef INVOKE
#undef DISPATCH
template <typename T> bool operator< (const Decimal<T> & x, const Decimal<T> & y);
template <typename T> bool operator> (const Decimal<T> & x, const Decimal<T> & y);
template <typename T> bool operator<= (const Decimal<T> & x, const Decimal<T> & y);
template <typename T> bool operator>= (const Decimal<T> & x, const Decimal<T> & y);
template <typename T> bool operator== (const Decimal<T> & x, const Decimal<T> & y);
template <typename T> bool operator!= (const Decimal<T> & x, const Decimal<T> & y);
#define DISPATCH(TYPE) \
extern template bool operator< (const Decimal<TYPE> & x, const Decimal<TYPE> & y); \
extern template bool operator> (const Decimal<TYPE> & x, const Decimal<TYPE> & y); \
extern template bool operator<= (const Decimal<TYPE> & x, const Decimal<TYPE> & y); \
extern template bool operator>= (const Decimal<TYPE> & x, const Decimal<TYPE> & y); \
extern template bool operator== (const Decimal<TYPE> & x, const Decimal<TYPE> & y); \
extern template bool operator!= (const Decimal<TYPE> & x, const Decimal<TYPE> & y);
FOR_EACH_UNDERLYING_DECIMAL_TYPE(DISPATCH)
#undef DISPATCH
template <typename T> Decimal<T> operator+ (const Decimal<T> & x, const Decimal<T> & y);
template <typename T> Decimal<T> operator- (const Decimal<T> & x, const Decimal<T> & y);
template <typename T> Decimal<T> operator* (const Decimal<T> & x, const Decimal<T> & y);
template <typename T> Decimal<T> operator/ (const Decimal<T> & x, const Decimal<T> & y);
template <typename T> Decimal<T> operator- (const Decimal<T> & x);
#define DISPATCH(TYPE) \
extern template Decimal<TYPE> operator+ (const Decimal<TYPE> & x, const Decimal<TYPE> & y); \
extern template Decimal<TYPE> operator- (const Decimal<TYPE> & x, const Decimal<TYPE> & y); \
extern template Decimal<TYPE> operator* (const Decimal<TYPE> & x, const Decimal<TYPE> & y); \
extern template Decimal<TYPE> operator/ (const Decimal<TYPE> & x, const Decimal<TYPE> & y); \
extern template Decimal<TYPE> operator- (const Decimal<TYPE> & x);
FOR_EACH_UNDERLYING_DECIMAL_TYPE(DISPATCH)
#undef DISPATCH
#undef FOR_EACH_UNDERLYING_DECIMAL_TYPE_PASS
#undef FOR_EACH_UNDERLYING_DECIMAL_TYPE
/// Distinguishable type to allow function resolution/deduction based on value type,
/// but also relatively easy to convert to/from Decimal64.
class DateTime64 : public Decimal64
{
public:
using Base = Decimal64;
using Base::Base;
using NativeType = Base::NativeType;
constexpr DateTime64(const Base & v): Base(v) {} // NOLINT(google-explicit-constructor)
};
}
constexpr UInt64 max_uint_mask = std::numeric_limits<UInt64>::max();
namespace std
{
template <typename T>
struct hash<DB::Decimal<T>>
{
size_t operator()(const DB::Decimal<T> & x) const { return hash<T>()(x.value); }
};
template <>
struct hash<DB::Decimal128>
{
size_t operator()(const DB::Decimal128 & x) const
{
return std::hash<Int64>()(x.value >> 64)
^ std::hash<Int64>()(x.value & max_uint_mask);
}
};
template <>
struct hash<DB::DateTime64>
{
size_t operator()(const DB::DateTime64 & x) const
{
return std::hash<DB::DateTime64::NativeType>()(x);
}
};
template <>
struct hash<DB::Decimal256>
{
size_t operator()(const DB::Decimal256 & x) const
{
// FIXME temp solution
return std::hash<Int64>()(static_cast<Int64>(x.value >> 64 & max_uint_mask))
^ std::hash<Int64>()(static_cast<Int64>(x.value & max_uint_mask));
}
};
}