// Boost.Units - A C++ library for zero-overhead dimensional analysis and
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// unit/quantity manipulation and conversion
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//
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// Copyright (C) 2003-2008 Matthias Christian Schabel
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// Copyright (C) 2008 Steven Watanabe
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_UNITS_POW_HPP
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#define BOOST_UNITS_POW_HPP
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#include <boost/type_traits/is_integral.hpp>
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#include <boost/units/operators.hpp>
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#include <boost/units/static_rational.hpp>
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#include <boost/units/detail/static_rational_power.hpp>
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/// \file
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/// \brief Raise values to exponents known at compile-time.
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namespace boost {
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namespace units {
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/// raise a value to a @c static_rational power.
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template<class Rat,class Y>
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BOOST_CONSTEXPR
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inline typename power_typeof_helper<Y,Rat>::type
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pow(const Y& x)
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{
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return power_typeof_helper<Y,Rat>::value(x);
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}
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/// raise a value to an integer power.
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template<long N,class Y>
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BOOST_CONSTEXPR
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inline typename power_typeof_helper<Y,static_rational<N> >::type
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pow(const Y& x)
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{
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return power_typeof_helper<Y,static_rational<N> >::value(x);
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}
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#ifndef BOOST_UNITS_DOXYGEN
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/// raise @c T to a @c static_rational power.
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template<class T, long N,long D>
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struct power_typeof_helper<T, static_rational<N,D> >
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{
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typedef typename mpl::if_<boost::is_integral<T>, double, T>::type internal_type;
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typedef detail::static_rational_power_impl<static_rational<N, D>, internal_type> impl;
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typedef typename impl::type type;
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static BOOST_CONSTEXPR type value(const T& x)
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{
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return impl::call(x);
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}
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};
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/// raise @c float to a @c static_rational power.
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template<long N,long D>
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struct power_typeof_helper<float, static_rational<N,D> >
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{
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// N.B. pathscale doesn't accept inheritance for some reason.
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typedef power_typeof_helper<double, static_rational<N,D> > base;
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typedef typename base::type type;
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static BOOST_CONSTEXPR type value(const double& x)
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{
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return base::value(x);
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}
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};
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#endif
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/// take the @c static_rational root of a value.
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template<class Rat,class Y>
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BOOST_CONSTEXPR
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typename root_typeof_helper<Y,Rat>::type
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root(const Y& x)
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{
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return root_typeof_helper<Y,Rat>::value(x);
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}
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/// take the integer root of a value.
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template<long N,class Y>
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BOOST_CONSTEXPR
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typename root_typeof_helper<Y,static_rational<N> >::type
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root(const Y& x)
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{
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return root_typeof_helper<Y,static_rational<N> >::value(x);
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}
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#ifndef BOOST_UNITS_DOXYGEN
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/// take @c static_rational root of an @c T
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template<class T, long N,long D>
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struct root_typeof_helper<T,static_rational<N,D> >
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{
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// N.B. pathscale doesn't accept inheritance for some reason.
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typedef power_typeof_helper<T, static_rational<D,N> > base;
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typedef typename base::type type;
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static BOOST_CONSTEXPR type value(const T& x)
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{
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return(base::value(x));
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}
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};
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#endif
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} // namespace units
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} // namespace boost
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#endif // BOOST_UNITS_STATIC_RATIONAL_HPP
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