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1d42c4f6de
Per XLS-0095, we are taking steps to rename ripple(d) to xrpl(d). This change specifically removes all copyright notices referencing Ripple, XRPLF, and certain affiliated contributors upon mutual agreement, so the notice in the LICENSE.md file applies throughout. Copyright notices referencing external contributions remain as-is. Duplicate verbiage is also removed.
156 lines
3.4 KiB
C++
156 lines
3.4 KiB
C++
#ifndef XRPL_PROTOCOL_MPTAMOUNT_H_INCLUDED
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#define XRPL_PROTOCOL_MPTAMOUNT_H_INCLUDED
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#include <xrpl/basics/Number.h>
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#include <xrpl/basics/contract.h>
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#include <xrpl/basics/safe_cast.h>
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#include <xrpl/beast/utility/Zero.h>
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#include <boost/multiprecision/cpp_int.hpp>
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#include <boost/operators.hpp>
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#include <cstdint>
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#include <string>
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namespace ripple {
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class MPTAmount : private boost::totally_ordered<MPTAmount>,
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private boost::additive<MPTAmount>,
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private boost::equality_comparable<MPTAmount, std::int64_t>,
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private boost::additive<MPTAmount, std::int64_t>
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{
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public:
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using value_type = std::int64_t;
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protected:
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value_type value_;
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public:
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MPTAmount() = default;
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constexpr MPTAmount(MPTAmount const& other) = default;
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constexpr MPTAmount&
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operator=(MPTAmount const& other) = default;
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// Round to nearest, even on tie.
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explicit MPTAmount(Number const& x) : MPTAmount(static_cast<value_type>(x))
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{
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}
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constexpr explicit MPTAmount(value_type value);
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constexpr MPTAmount& operator=(beast::Zero);
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MPTAmount&
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operator+=(MPTAmount const& other);
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MPTAmount&
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operator-=(MPTAmount const& other);
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MPTAmount
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operator-() const;
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bool
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operator==(MPTAmount const& other) const;
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bool
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operator==(value_type other) const;
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bool
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operator<(MPTAmount const& other) const;
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/** Returns true if the amount is not zero */
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explicit constexpr
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operator bool() const noexcept;
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operator Number() const noexcept
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{
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return value();
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}
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/** Return the sign of the amount */
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constexpr int
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signum() const noexcept;
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/** Returns the underlying value. Code SHOULD NOT call this
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function unless the type has been abstracted away,
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e.g. in a templated function.
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*/
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constexpr value_type
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value() const;
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static MPTAmount
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minPositiveAmount();
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};
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constexpr MPTAmount::MPTAmount(value_type value) : value_(value)
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{
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}
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constexpr MPTAmount&
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MPTAmount::operator=(beast::Zero)
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{
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value_ = 0;
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return *this;
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}
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/** Returns true if the amount is not zero */
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constexpr MPTAmount::operator bool() const noexcept
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{
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return value_ != 0;
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}
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/** Return the sign of the amount */
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constexpr int
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MPTAmount::signum() const noexcept
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{
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return (value_ < 0) ? -1 : (value_ ? 1 : 0);
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}
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/** Returns the underlying value. Code SHOULD NOT call this
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function unless the type has been abstracted away,
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e.g. in a templated function.
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*/
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constexpr MPTAmount::value_type
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MPTAmount::value() const
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{
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return value_;
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}
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inline std::string
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to_string(MPTAmount const& amount)
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{
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return std::to_string(amount.value());
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}
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inline MPTAmount
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mulRatio(
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MPTAmount const& amt,
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std::uint32_t num,
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std::uint32_t den,
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bool roundUp)
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{
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using namespace boost::multiprecision;
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if (!den)
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Throw<std::runtime_error>("division by zero");
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int128_t const amt128(amt.value());
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auto const neg = amt.value() < 0;
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auto const m = amt128 * num;
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auto r = m / den;
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if (m % den)
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{
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if (!neg && roundUp)
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r += 1;
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if (neg && !roundUp)
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r -= 1;
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}
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if (r > std::numeric_limits<MPTAmount::value_type>::max())
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Throw<std::overflow_error>("MPT mulRatio overflow");
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return MPTAmount(r.convert_to<MPTAmount::value_type>());
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}
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} // namespace ripple
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#endif // XRPL_BASICS_MPTAMOUNT_H_INCLUDED
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