forked from boostorg/mpl
87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
//-----------------------------------------------------------------------------
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// boost/mpl/intergal_c.hpp header file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2000-02
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// Aleksey Gurtovoy
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appears in all copies and
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// that both the copyright notice and this permission notice appear in
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// supporting documentation. No representations are made about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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#ifndef BOOST_MPL_INTEGRAL_C_HPP_INCLUDED
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#define BOOST_MPL_INTEGRAL_C_HPP_INCLUDED
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#include "boost/mpl/aux_/ice_cast.hpp"
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#include "boost/mpl/aux_/config/static_constant.hpp"
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#include "boost/mpl/aux_/config/workaround.hpp"
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namespace boost {
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namespace mpl {
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template< typename T,
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// the type of non-type template arguments may not depend on template arguments
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#if BOOST_WORKAROUND(__HP_aCC, BOOST_TESTED_AT(53800))
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long
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#else
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T
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#endif
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N >
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struct integral_c
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{
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BOOST_STATIC_CONSTANT(T, value = N);
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typedef integral_c type;
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typedef T value_type;
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// Note that the static_casts below are there to handle the case
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// where T is an enum type.
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// have to #ifdef here: some compilers don't like the 'N + 1' form (MSVC),
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// while some other don't like 'value + 1' (Borland), and some don't like
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// either
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#if defined(__EDG_VERSION__) && __EDG_VERSION__ <= 243
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private:
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BOOST_STATIC_CONSTANT(T, next_value = BOOST_MPL_AUX_ICE_CAST(T, (N + 1)));
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BOOST_STATIC_CONSTANT(T, prior_value = BOOST_MPL_AUX_ICE_CAST(T, (N - 1)));
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public:
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typedef integral_c<T, next_value> next;
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typedef integral_c<T, prior_value> prior;
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#elif BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x561)) \
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|| BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(502)) \
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|| BOOST_WORKAROUND(__HP_aCC, BOOST_TESTED_AT(53800))
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typedef integral_c<T, BOOST_MPL_AUX_ICE_CAST(T, (N + 1))> next;
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typedef integral_c<T, BOOST_MPL_AUX_ICE_CAST(T, (N - 1))> prior;
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#else
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typedef integral_c<T, BOOST_MPL_AUX_ICE_CAST(T, (value + 1))> next;
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typedef integral_c<T, BOOST_MPL_AUX_ICE_CAST(T, (value - 1))> prior;
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#endif
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// enables uniform function call syntax for families of overloaded
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// functions that return objects of both arithmetic ('int', 'long',
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// 'double', etc.) and 'integral_c<..>' types (for an example, see
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// "mpl/example/power.cpp")
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operator T() const { return this->value; }
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};
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#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \
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&& !BOOST_WORKAROUND(__BORLANDC__, <= 0x551)
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// 'bool' constant doesn't have 'next'/'prior' members
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template< bool C >
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struct integral_c<bool, C>
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{
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BOOST_STATIC_CONSTANT(bool, value = C);
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typedef integral_c type;
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operator bool() const { return this->value; }
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};
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#endif
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} // namespace mpl
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} // namespace boost
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#endif // BOOST_MPL_INTEGRAL_C_HPP_INCLUDED
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