claw 1.9.0
 
Loading...
Searching...
No Matches
real_number.hpp
Go to the documentation of this file.
1/*
2 CLAW - a C++ Library Absolutely Wonderful
3
4 CLAW is a free library without any particular aim but being useful to
5 anyone.
6
7 Copyright (C) 2005-2011 Julien Jorge
8
9 This library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Lesser General Public
11 License as published by the Free Software Foundation; either
12 version 2.1 of the License, or (at your option) any later version.
13
14 This library is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
18
19 You should have received a copy of the GNU Lesser General Public
20 License along with this library; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22
23 contact: julien.jorge@stuff-o-matic.com
24*/
30#ifndef __CLAW_REAL_NUMBER_HPP__
31#define __CLAW_REAL_NUMBER_HPP__
32
33#include <iostream>
34#include <limits>
35
36namespace claw
37{
38 template <typename T>
39 class real_number;
40}
41
42template <typename T>
43std::istream& operator>>(std::istream& is, claw::real_number<T>& self);
44
45namespace claw
46{
51 template <typename T>
53 {
54 static T value(T v)
55 {
56 return std::abs(v) <= 1
57 ? std::numeric_limits<T>::epsilon()
58 : std::abs(v) * std::numeric_limits<T>::epsilon();
59 }
60 }; // struct make_epsilon
61
66 template <typename T>
67 class real_number
68 {
69 friend std::istream& ::operator>><>(std::istream& is,
70 real_number<T>& self);
71
72 public:
73 typedef T value_type;
74 typedef real_number<T> self_type;
75
76 public:
77 real_number();
78 real_number(const value_type& v);
79 real_number(const self_type& that);
80
81 self_type abs() const;
82
83 bool operator<(const self_type& that) const;
84 bool operator<=(const self_type& that) const;
85 bool operator>(const self_type& that) const;
86 bool operator>=(const self_type& that) const;
87 bool operator==(const self_type& that) const;
88 bool operator!=(const self_type& that) const;
89
90 self_type operator+(const self_type& that) const;
91 self_type operator-(const self_type& that) const;
92 self_type operator*(const self_type& that) const;
93 self_type operator/(const self_type& that) const;
94
95 self_type& operator+=(const self_type& that);
96 self_type& operator-=(const self_type& that);
97 self_type& operator*=(const self_type& that);
98 self_type& operator/=(const self_type& that);
99
100 std::ostream& output(std::ostream& os) const;
101
102 template <typename U>
103 operator U() const;
104
105 private:
107 value_type m_value;
108
110 value_type m_epsilon;
111
112 }; // class real_number
113}
114
115namespace std
116{
117 template <typename T>
118 struct numeric_limits<claw::real_number<T> > : public numeric_limits<T>
119 {}; // struct numeric_limits
120
121 template <typename T>
123}
124
125// unary minus
126template <typename T>
127claw::real_number<T> operator-(const claw::real_number<T>& self);
128
129template <typename T>
130claw::real_number<T> operator-(T v, const claw::real_number<T>& self);
131
132template <typename T>
133std::ostream& operator<<(std::ostream& os, const claw::real_number<T>& self);
134template <typename T>
135std::istream& operator>>(std::istream& is, claw::real_number<T>& self);
136
137#include "claw/real_number.tpp"
138
139#endif // __CLAW_REAL_NUMBER_HPP__
Custom precision real numbers.
This is the main namespace.
This class generates an epsilon value of a given precision.