/*-----------------------------------------------------------------------------+ | |
Copyright (c) 2008-2010: 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_UNIT_ELEMENT_HPP_JOFA_080912 | |
#define BOOST_ICL_TYPE_TRAITS_UNIT_ELEMENT_HPP_JOFA_080912 | |
#include <string> | |
#include <boost/icl/type_traits/identity_element.hpp> | |
#include <boost/icl/type_traits/succ_pred.hpp> | |
namespace boost{ namespace icl | |
{ | |
template <class Type> struct unit_element{ static Type value(); }; | |
template<> inline bool unit_element<bool>::value() { return true;} | |
template<> inline float unit_element<float>::value() { return 1.0; } | |
template<> inline double unit_element<double>::value() { return 1.0; } | |
template<> inline long double unit_element<long double>::value() | |
{ return 1.0; } | |
// Smallest 'visible' string that is greater than the empty string. | |
template <> | |
inline std::string unit_element<std::string>::value() | |
{ return std::string(" "); } | |
template <class Type> | |
inline Type unit_element<Type>::value() | |
{ return icl::succ(identity_element<Type>::value()); } | |
}} // namespace boost icl | |
#endif | |