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160bda7228
https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules "The compiler is more likely to get the default semantics right and you cannot implement these functions better than the compiler."
71 lines
1.5 KiB
C++
71 lines
1.5 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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* Copyright (c) 2022, the SerenityOS developers.
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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 "KeypadValue.h"
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// This type implements the regular calculator
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// behavior, such as performing arithmetic
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// operations and providing a memory cell.
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// It does not deal with number input; you
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// have to pass in already parsed double
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// values.
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class Calculator final {
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public:
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Calculator() = default;
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~Calculator() = default;
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enum class Operation {
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None,
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Add,
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Subtract,
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Multiply,
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Divide,
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Sqrt,
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Inverse,
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Percent,
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ToggleSign,
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MemClear,
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MemRecall,
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MemSave,
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MemAdd
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};
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KeypadValue begin_operation(Operation, KeypadValue);
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KeypadValue finish_operation(KeypadValue);
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bool has_error() const { return m_has_error; }
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void clear_operation();
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void clear_error() { m_has_error = false; }
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private:
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static bool should_be_rounded(KeypadValue);
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static void round(KeypadValue&);
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static constexpr auto rounding_threshold = []() consteval
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{
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using used_type = u64;
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auto count = 1;
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used_type res = 10;
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while (!__builtin_mul_overflow(res, (used_type)10, &res)) {
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count++;
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}
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return count;
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}
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();
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Operation m_operation_in_progress { Operation::None };
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KeypadValue m_saved_argument { (i64)0 };
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KeypadValue m_mem { (i64)0 };
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bool m_has_error { false };
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};
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