mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-05 22:34:49 +00:00
ae3ffdd521
This patch adds the `USING_AK_GLOBALLY` macro which is enabled by default, but can be overridden by build flags. This is a step towards integrating Jakt and AK types.
46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
/*
|
|
* Copyright (c) 2022, Dan Klishch <danilklishch@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#ifdef KERNEL
|
|
# error This file should not be included in the KERNEL, as doubles should not appear in the \
|
|
kernel code, although the conversion currently does not use any floating point \
|
|
computations.
|
|
#endif
|
|
|
|
#include <AK/Concepts.h>
|
|
#include <AK/Types.h>
|
|
|
|
namespace AK {
|
|
|
|
struct FloatingPointExponentialForm {
|
|
bool sign;
|
|
u64 fraction;
|
|
i32 exponent;
|
|
};
|
|
|
|
/// This function finds the representation of `value' in the form of
|
|
/// `(-1) ^ sign * fraction * 10 ^ exponent', such that (applying in the order of enumeration):
|
|
///
|
|
/// 1. sign is either 0 or 1, fraction is a non-negative number, exponent is an integer.
|
|
/// 2. For +0, it is {.sign = 0, .fraction = 0, .exponent = 0},
|
|
/// for -0, is {.sign = 1, .fraction = 0, .exponent = 0},
|
|
/// for +inf, -inf, and NaN is undefined.
|
|
/// 3. `(-1) ^ sign * fraction * 10 ^ exponent', computed with an infinite precision, rounds to
|
|
/// `value' in the half to even mode.
|
|
/// 4. len(str(fraction)) is minimal.
|
|
/// 5. `abs((-1) ^ sign * fraction * 10 ^ exponent - value)' is minimal.
|
|
/// 6. fraction is even.
|
|
template<FloatingPoint T>
|
|
FloatingPointExponentialForm convert_floating_point_to_decimal_exponential_form(T value);
|
|
|
|
}
|
|
|
|
#if USING_AK_GLOBALLY
|
|
using AK::convert_floating_point_to_decimal_exponential_form;
|
|
#endif
|