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46 lines
1.5 KiB
46 lines
1.5 KiB
7 months ago
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// Copyright 2020 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef UTIL_SIMPLE_FRACTION_H_
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#define UTIL_SIMPLE_FRACTION_H_
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#include <string>
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#include "absl/strings/string_view.h"
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#include "platform/base/error.h"
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namespace openscreen {
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// SimpleFraction is used to represent simple (or "common") fractions, composed
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// of a rational number written a/b where a and b are both integers.
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// Note: Since SimpleFraction is a trivial type, it comes with a
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// default constructor and is copyable, as well as allowing static
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// initialization.
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// Some helpful notes on SimpleFraction assumptions/limitations:
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// 1. SimpleFraction does not perform reductions. 2/4 != 1/2, and -1/-1 != 1/1.
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// 2. denominator = 0 is considered undefined.
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// 3. numerator = saturates range to int min or int max
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// 4. A SimpleFraction is "positive" if and only if it is defined and at least
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// equal to zero. Since reductions are not performed, -1/-1 is negative.
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struct SimpleFraction {
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static ErrorOr<SimpleFraction> FromString(absl::string_view value);
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std::string ToString() const;
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bool operator==(const SimpleFraction& other) const;
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bool operator!=(const SimpleFraction& other) const;
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bool is_defined() const;
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bool is_positive() const;
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explicit operator double() const;
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int numerator = 0;
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int denominator = 0;
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};
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} // namespace openscreen
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#endif // UTIL_SIMPLE_FRACTION_H_
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