libcruft-util/rational.hpp
Danny Robson f6056153e3 rename root namespace from util to cruft
This places, at long last, the core library code into the same namespace
as the extended library code.
2018-08-05 14:42:02 +10:00

73 lines
1.9 KiB
C++

/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Copyright 2014-2015 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_RATIONAL_HPP
#define __UTIL_RATIONAL_HPP
#include <type_traits>
#include <iosfwd>
namespace cruft {
template <typename T>
struct rational {
static_assert (std::is_integral<T>::value, "only defined for integer types");
rational (const rational&) = default;
rational (T n, T d);
explicit rational (T);
bool operator== (rational) const;
bool operator!= (rational) const;
bool operator< (rational) const;
bool operator>= (rational) const;
explicit operator float (void) const;
explicit operator double (void) const;
explicit operator int (void) const;
rational<T> reduced (void) const;
rational<T> inverse (void) const;
rational<T>& invert (void);
rational<T> operator+ (T) const;
rational<T> operator- (T) const;
rational<T> operator* (T) const;
rational<T> operator/ (T) const;
T n;
T d;
};
///////////////////////////////////////////////////////////////////////////
template <typename T, typename U>
rational<typename std::common_type<T,U>::type>
operator/ (U lhs, rational<T> rhs)
{
return rhs.inverse () * lhs;
}
//-------------------------------------------------------------------------
template <typename T, typename U>
rational<typename std::common_type<T,U>::type>
operator* (U lhs, rational<T> rhs)
{
return rhs * lhs;
}
///////////////////////////////////////////////////////////////////////////
template <typename ValueT>
std::ostream& operator<< (std::ostream&, rational<ValueT>);
};
#endif