libcruft-util/fixed.hpp

118 lines
4.5 KiB
C++

/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2011-2014 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_FIXED_HPP
#define __UTIL_FIXED_HPP
#include "types/bits.hpp"
#include "maths.hpp"
#include "endian.hpp"
#include <iosfwd>
namespace util {
template <typename T, unsigned I, unsigned E>
class [[gnu::packed]] fixed {
public:
static_assert (I > 0);
static_assert (E > 0);
static_assert ((I + E) % 8 == 0);
using sint_t = typename bits_type<I+E>::sint;
using uint_t = typename bits_type<I+E>::uint;
using native_type = typename std::conditional<
std::is_signed<T>::value,
sint_t, uint_t
>::type;
using integer_type = typename std::conditional<
std::is_signed<T>::value,
typename bits_type<divup (I, 8u) * 8u>::sint,
typename bits_type<divup (I, 8u) * 8u>::uint
>::type;
explicit fixed (double);
explicit fixed (float);
double to_double (void) const;
float to_float (void) const;
integer_type to_integer (void) const;
native_type to_native (void) const;
static fixed<T,I,E> from_native (native_type);
static fixed<T,I,E> from_integer (integer_type);
static integer_type to_integer (native_type);
fixed<T,I,E>& operator +=(const fixed<T,I,E>);
fixed<T,I,E>& operator -=(const fixed<T,I,E>);
fixed<T,I,E>& operator *=(const fixed<T,I,E>);
fixed<T,I,E>& operator /=(const fixed<T,I,E>);
fixed<T,I,E> operator +(const fixed<T,I,E>) const;
fixed<T,I,E> operator -(const fixed<T,I,E>) const;
fixed<T,I,E> operator *(const fixed<T,I,E>) const;
fixed<T,I,E> operator /(const fixed<T,I,E>) const;
fixed<T,I,E>& operator +=(integer_type);
fixed<T,I,E>& operator -=(integer_type);
fixed<T,I,E>& operator *=(integer_type);
fixed<T,I,E>& operator /=(integer_type);
fixed<T,I,E> operator +(integer_type) const;
fixed<T,I,E> operator -(integer_type) const;
fixed<T,I,E> operator *(integer_type) const;
fixed<T,I,E> operator /(integer_type) const;
private:
fixed () = default;
native_type m_value;
};
template <typename T, unsigned I, unsigned E>
constexpr
fixed<T,I,E>
bswap (fixed<T,I,E> val)
{
return fixed<T,I,E>::from_native (
bswap (val.to_native ())
);
}
template <typename T, unsigned I, unsigned E> bool operator== (util::fixed<T,I,E>, util::fixed<T,I,E>);
template <typename T, unsigned I, unsigned E> bool operator!= (util::fixed<T,I,E>, util::fixed<T,I,E>);
template <typename T, unsigned I, unsigned E> bool operator< (util::fixed<T,I,E>, util::fixed<T,I,E>);
template <typename T, unsigned I, unsigned E> bool operator<= (util::fixed<T,I,E>, util::fixed<T,I,E>);
template <typename T, unsigned I, unsigned E> bool operator> (util::fixed<T,I,E>, util::fixed<T,I,E>);
template <typename T, unsigned I, unsigned E> bool operator>= (util::fixed<T,I,E>, util::fixed<T,I,E>);
template <typename T, unsigned I, unsigned E> bool operator== (util::fixed<T,I,E>, typename util::fixed<T,I,E>::integer_type);
template <typename T, unsigned I, unsigned E> bool operator!= (util::fixed<T,I,E>, typename util::fixed<T,I,E>::integer_type);
template <typename T, unsigned I, unsigned E> bool operator< (util::fixed<T,I,E>, typename util::fixed<T,I,E>::integer_type);
template <typename T, unsigned I, unsigned E> bool operator<= (util::fixed<T,I,E>, typename util::fixed<T,I,E>::integer_type);
template <typename T, unsigned I, unsigned E> bool operator> (util::fixed<T,I,E>, typename util::fixed<T,I,E>::integer_type);
template <typename T, unsigned I, unsigned E> bool operator>= (util::fixed<T,I,E>, typename util::fixed<T,I,E>::integer_type);
template <typename T, unsigned I, unsigned E>
std::ostream& operator<< (std::ostream&, fixed<T,I,E>);
}
#endif // __UTIL_FIXED_HPP