114 lines
4.4 KiB
C++
114 lines
4.4 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2011-2014 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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#include "types/sized.hpp"
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#include "maths.hpp"
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#include <iosfwd>
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namespace cruft {
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template <
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// whether the type is signed or unsigned. supply an appropriately
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// signed type here; it won't be used for anything else.
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typename T,
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// how many bits total are used for the integral component
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unsigned I,
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// how many bits are used for the fractional component
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unsigned E
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>
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class [[gnu::packed]] fixed {
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public:
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static_assert (I > 0);
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static_assert (E > 0);
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static_assert ((I + E) % 8 == 0);
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using sint_t = typename types::sized::bits<I+E>::sint;
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using uint_t = typename types::sized::bits<I+E>::uint;
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using native_type = typename std::conditional<
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std::is_signed<T>::value,
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sint_t, uint_t
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>::type;
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using integer_type = typename std::conditional<
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std::is_signed<T>::value,
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typename types::sized::bits<divup (I, 8u) * 8u>::sint,
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typename types::sized::bits<divup (I, 8u) * 8u>::uint
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>::type;
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explicit fixed (double);
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explicit fixed (float);
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double to_double (void) const;
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float to_float (void) const;
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integer_type to_integer (void) const;
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native_type to_native (void) const;
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static fixed<T,I,E> from_native (native_type);
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static fixed<T,I,E> from_integer (integer_type);
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static integer_type to_integer (native_type);
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fixed<T,I,E>& operator +=(const fixed<T,I,E>);
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fixed<T,I,E>& operator -=(const fixed<T,I,E>);
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fixed<T,I,E>& operator *=(const fixed<T,I,E>);
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fixed<T,I,E>& operator /=(const fixed<T,I,E>);
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fixed<T,I,E> operator +(const fixed<T,I,E>) const;
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fixed<T,I,E> operator -(const fixed<T,I,E>) const;
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fixed<T,I,E> operator *(const fixed<T,I,E>) const;
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fixed<T,I,E> operator /(const fixed<T,I,E>) const;
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fixed<T,I,E>& operator +=(integer_type);
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fixed<T,I,E>& operator -=(integer_type);
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fixed<T,I,E>& operator *=(integer_type);
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fixed<T,I,E>& operator /=(integer_type);
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fixed<T,I,E> operator +(integer_type) const;
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fixed<T,I,E> operator -(integer_type) const;
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fixed<T,I,E> operator *(integer_type) const;
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fixed<T,I,E> operator /(integer_type) const;
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private:
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fixed () = default;
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native_type m_value;
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};
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template <typename T, unsigned I, unsigned E>
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constexpr
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fixed<T,I,E>
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bswap (fixed<T,I,E> val)
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{
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return fixed<T,I,E>::from_native (
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bswap (val.to_native ())
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);
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}
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template <typename T, unsigned I, unsigned E> bool operator== (cruft::fixed<T,I,E>, cruft::fixed<T,I,E>);
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template <typename T, unsigned I, unsigned E> bool operator!= (cruft::fixed<T,I,E>, cruft::fixed<T,I,E>);
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template <typename T, unsigned I, unsigned E> bool operator< (cruft::fixed<T,I,E>, cruft::fixed<T,I,E>);
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template <typename T, unsigned I, unsigned E> bool operator<= (cruft::fixed<T,I,E>, cruft::fixed<T,I,E>);
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template <typename T, unsigned I, unsigned E> bool operator> (cruft::fixed<T,I,E>, cruft::fixed<T,I,E>);
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template <typename T, unsigned I, unsigned E> bool operator>= (cruft::fixed<T,I,E>, cruft::fixed<T,I,E>);
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template <typename T, unsigned I, unsigned E> bool operator== (cruft::fixed<T,I,E>, typename cruft::fixed<T,I,E>::integer_type);
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template <typename T, unsigned I, unsigned E> bool operator!= (cruft::fixed<T,I,E>, typename cruft::fixed<T,I,E>::integer_type);
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template <typename T, unsigned I, unsigned E> bool operator< (cruft::fixed<T,I,E>, typename cruft::fixed<T,I,E>::integer_type);
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template <typename T, unsigned I, unsigned E> bool operator<= (cruft::fixed<T,I,E>, typename cruft::fixed<T,I,E>::integer_type);
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template <typename T, unsigned I, unsigned E> bool operator> (cruft::fixed<T,I,E>, typename cruft::fixed<T,I,E>::integer_type);
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template <typename T, unsigned I, unsigned E> bool operator>= (cruft::fixed<T,I,E>, typename cruft::fixed<T,I,E>::integer_type);
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template <typename T, unsigned I, unsigned E>
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std::ostream& operator<< (std::ostream&, fixed<T,I,E>);
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}
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