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