131 lines
2.9 KiB
C++
131 lines
2.9 KiB
C++
/* Boost interval/checking.hpp template implementation file
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*
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* Copyright 2002 Hervé Brönnimann, Guillaume Melquiond, Sylvain Pion
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*
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or
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* copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_NUMERIC_INTERVAL_CHECKING_HPP
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#define BOOST_NUMERIC_INTERVAL_CHECKING_HPP
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#include <stdexcept>
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#include <string>
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#include <cassert>
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#include <boost/limits.hpp>
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namespace boost {
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namespace numeric {
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namespace interval_lib {
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struct exception_create_empty
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{
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void operator()()
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{
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throw std::runtime_error("boost::interval: empty interval created");
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}
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};
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struct exception_invalid_number
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{
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void operator()()
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{
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throw std::invalid_argument("boost::interval: invalid number");
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}
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};
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template<class T>
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struct checking_base
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{
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static T pos_inf()
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{
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assert(std::numeric_limits<T>::has_infinity);
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return std::numeric_limits<T>::infinity();
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}
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static T neg_inf()
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{
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assert(std::numeric_limits<T>::has_infinity);
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return -std::numeric_limits<T>::infinity();
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}
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static T nan()
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{
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assert(std::numeric_limits<T>::has_quiet_NaN);
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return std::numeric_limits<T>::quiet_NaN();
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}
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static bool is_nan(const T& x)
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{
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return std::numeric_limits<T>::has_quiet_NaN && (x != x);
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}
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static T empty_lower()
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{
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return (std::numeric_limits<T>::has_quiet_NaN ?
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std::numeric_limits<T>::quiet_NaN() : static_cast<T>(1));
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}
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static T empty_upper()
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{
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return (std::numeric_limits<T>::has_quiet_NaN ?
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std::numeric_limits<T>::quiet_NaN() : static_cast<T>(0));
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}
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static bool is_empty(const T& l, const T& u)
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{
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return !(l <= u); // safety for partial orders
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}
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};
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template<class T, class Checking = checking_base<T>,
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class Exception = exception_create_empty>
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struct checking_no_empty: Checking
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{
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static T nan()
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{
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assert(false);
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return Checking::nan();
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}
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static T empty_lower()
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{
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Exception()();
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return Checking::empty_lower();
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}
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static T empty_upper()
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{
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Exception()();
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return Checking::empty_upper();
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}
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static bool is_empty(const T&, const T&)
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{
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return false;
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}
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};
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template<class T, class Checking = checking_base<T> >
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struct checking_no_nan: Checking
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{
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static bool is_nan(const T&)
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{
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return false;
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}
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};
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template<class T, class Checking = checking_base<T>,
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class Exception = exception_invalid_number>
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struct checking_catch_nan: Checking
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{
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static bool is_nan(const T& x)
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{
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if (Checking::is_nan(x)) Exception()();
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return false;
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}
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};
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template<class T>
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struct checking_strict:
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checking_no_nan<T, checking_no_empty<T> >
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{};
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} // namespace interval_lib
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} // namespace numeric
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} // namespace boost
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#endif // BOOST_NUMERIC_INTERVAL_CHECKING_HPP
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