6bb32efac0
now that we are using C++20, it'd be more convenient if we can use the <=> operator for comparing. the compiler creates the 6 other operators for us if the <=> operator is defined. so the code is more compacted. in this change, `big_decimal::compare()` is replaced with `operator<=>`, and its caller is updated accordingly. Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
57 lines
1.5 KiB
C++
57 lines
1.5 KiB
C++
/*
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* Copyright (C) 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include "multiprecision_int.hh"
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#include <boost/multiprecision/cpp_int.hpp>
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#include <ostream>
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#include <compare>
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#include <concepts>
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#include "bytes.hh"
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uint64_t from_varint_to_integer(const utils::multiprecision_int& varint);
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class big_decimal {
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private:
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int32_t _scale;
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boost::multiprecision::cpp_int _unscaled_value;
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public:
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enum class rounding_mode {
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HALF_EVEN,
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};
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explicit big_decimal(sstring_view text);
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big_decimal();
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big_decimal(int32_t scale, boost::multiprecision::cpp_int unscaled_value);
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big_decimal(std::integral auto v) : big_decimal(0, v) {}
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int32_t scale() const { return _scale; }
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const boost::multiprecision::cpp_int& unscaled_value() const { return _unscaled_value; }
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boost::multiprecision::cpp_rational as_rational() const;
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sstring to_string() const;
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std::strong_ordering operator<=>(const big_decimal& other) const;
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big_decimal& operator+=(const big_decimal& other);
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big_decimal& operator-=(const big_decimal& other);
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big_decimal operator+(const big_decimal& other) const;
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big_decimal operator-(const big_decimal& other) const;
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big_decimal div(const ::uint64_t y, const rounding_mode mode) const;
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};
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template <>
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struct fmt::formatter<big_decimal> : fmt::formatter<std::string_view> {
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template <typename FormatContext>
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auto format(const big_decimal& v, FormatContext& ctx) const {
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return fmt::format_to(ctx.out(), "{}", v.to_string());
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}
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};
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