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57dc179b1f
This will make it easier to support both string types at the same time while we convert code, and tracking down remaining uses. One big exception is Value::to_string() in LibJS, where the name is dictated by the ToString AO.
75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
/*
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* Copyright (c) 2022, Lucas Chollet <lucas.chollet@free.fr>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/DeprecatedString.h>
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#include <LibCrypto/BigInt/SignedBigInteger.h>
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namespace Crypto {
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class BigFraction {
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// FIXME Make the whole API more error-friendly. This includes:
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// - Propagating errors from BigIntegers
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// - Returns errors from both BigFraction(StringView) and BigFraction(numerator, denominator);
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// - Duplicate fallible operators with a error-friendly version
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public:
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BigFraction() = default;
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explicit BigFraction(Crypto::SignedBigInteger);
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BigFraction(Crypto::SignedBigInteger numerator, Crypto::UnsignedBigInteger denominator);
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BigFraction(Crypto::BigFraction const&) = default;
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BigFraction(Crypto::BigFraction&&) = default;
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BigFraction& operator=(Crypto::BigFraction const&) = default;
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BigFraction& operator=(Crypto::BigFraction&&) = default;
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explicit BigFraction(StringView);
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explicit BigFraction(double);
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BigFraction operator+(BigFraction const&) const;
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BigFraction operator-(BigFraction const&) const;
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BigFraction operator*(BigFraction const&) const;
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BigFraction operator/(BigFraction const&) const;
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BigFraction operator-() const;
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bool operator<(BigFraction const&) const;
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bool operator==(BigFraction const&) const;
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BigFraction invert() const;
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BigFraction sqrt() const;
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void set_to_0();
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// Return a BigFraction in "scientific notation", as an example with:
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// - m_numerator = 2
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// - m_denominator = 3
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// - rounding_threshold = 4
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// The returned BigFraction will have:
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// - m_numerator = 6667
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// - m_denominator = 10000
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BigFraction rounded(unsigned rounding_threshold) const;
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DeprecatedString to_deprecated_string(unsigned rounding_threshold) const;
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double to_double() const;
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private:
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void reduce();
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// This class uses a pair of integers to store a value. The purpose is to
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// support any rational number without any numerical errors.
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// For example, if we were to represent the value -123.55 in this format,
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// the values could be -12355 for and 100 for m_denominator. However, this
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// pair of value is not unique and the value will be reduced to -2471/20.
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// This way, most operations don't have to be performed on doubles, but can
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// be performed without loss of precision on this class.
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Crypto::SignedBigInteger m_numerator { 0 };
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Crypto::UnsignedBigInteger m_denominator { 1 };
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};
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}
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