forked from boostorg/mpl
74 lines
2.6 KiB
C++
74 lines
2.6 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/config.hpp"
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namespace boost {
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namespace mpl {
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template< typename T, T 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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// 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 = (N + 1));
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BOOST_STATIC_CONSTANT(T, prior_value = (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 defined(__BORLANDC__) && (__BORLANDC__ <= 0x561 || !defined(BOOST_STRICT_CONFIG)) \
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|| defined(__IBMCPP__) && (__IBMCPP__ <= 502 || !defined(BOOST_STRICT_CONFIG))
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typedef integral_c<T, (N + 1)> next;
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typedef integral_c<T, (N - 1)> prior;
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#else
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typedef integral_c<T, (value + 1)> next;
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typedef integral_c<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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&& !defined(__BORLANDC__) || __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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