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/*-----------------------------------------------------------------------------+ Copyright (c) 2010-2011: Joachim Faulhaber +------------------------------------------------------------------------------+ Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENCE.txt or copy at http://www.boost.org/LICENSE_1_0.txt) +-----------------------------------------------------------------------------*/ #ifndef BOOST_ICL_TYPE_TRAITS_INFINITY_HPP_JOFA_100322 #define BOOST_ICL_TYPE_TRAITS_INFINITY_HPP_JOFA_100322 #include <string> #include <boost/static_assert.hpp> #include <boost/icl/type_traits/is_numeric.hpp> #include <boost/icl/type_traits/rep_type_of.hpp> #include <boost/icl/type_traits/size_type_of.hpp> #include <boost/mpl/and.hpp> #include <boost/mpl/if.hpp> namespace boost{ namespace icl { template<class Type> struct has_std_infinity { typedef has_std_infinity type; BOOST_STATIC_CONSTANT(bool, value = ( is_numeric<Type>::value && std::numeric_limits<Type>::has_infinity ) ); }; template<class Type> struct has_max_infinity { typedef has_max_infinity type; BOOST_STATIC_CONSTANT(bool, value = ( is_numeric<Type>::value && ! std::numeric_limits<Type>::has_infinity ) ); }; //------------------------------------------------------------------------------ template <class Type, bool has_std_inf=false, bool has_std_max=false> struct get_numeric_infinity; template <class Type, bool has_std_max> struct get_numeric_infinity<Type, true, has_std_max> { typedef get_numeric_infinity type; static Type value() { return (std::numeric_limits<Type>::infinity)(); } }; template <class Type> struct get_numeric_infinity<Type, false, true> { typedef get_numeric_infinity type; static Type value() { return (std::numeric_limits<Type>::max)(); } }; template <class Type> struct get_numeric_infinity<Type, false, false> { typedef get_numeric_infinity type; static Type value() { return Type(); } }; template <class Type> struct numeric_infinity { typedef numeric_infinity type; static Type value() { return get_numeric_infinity< Type , has_std_infinity<Type>::value , has_max_infinity<Type>::value >::value(); } }; //------------------------------------------------------------------------------ template<class Type, bool has_numeric_inf, bool has_repr_inf, bool has_size, bool has_diff> struct get_infinity; template<class Type, bool has_repr_inf, bool has_size, bool has_diff> struct get_infinity<Type, true, has_repr_inf, has_size, has_diff> { typedef get_infinity type; static Type value() { return numeric_infinity<Type>::value(); } }; template<class Type, bool has_size, bool has_diff> struct get_infinity<Type, false, true, has_size, has_diff> { typedef get_infinity type; static Type value() { return Type(numeric_infinity<typename Type::rep>::value()); } }; template<class Type, bool has_diff> struct get_infinity<Type, false, false, true, has_diff> { typedef get_infinity type; typedef typename Type::size_type size_type; static Type value() { return Type(numeric_infinity<size_type>::value()); } }; template<class Type> struct get_infinity<Type, false, false, false, true> { typedef get_infinity type; typedef typename Type::difference_type difference_type; static Type value() { return identity_element<difference_type>::value(); } }; template<class Type> struct get_infinity<Type, false, false, false, false> { typedef get_infinity type; static Type value() { return identity_element<Type>::value(); } }; template <class Type> struct infinity { typedef infinity type; static Type value() { return get_infinity< Type , is_numeric<Type>::value , has_rep_type<Type>::value , has_size_type<Type>::value , has_difference_type<Type>::value >::value(); } }; template <> struct infinity<std::string> { typedef infinity type; static std::string value() { return std::string(); } }; }} // namespace boost icl #endif
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