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