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262 lines
7.3 KiB
C++
262 lines
7.3 KiB
C++
//---------------------------------------------------------------------------//
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// Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
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//
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// Distributed under the Boost Software License, Version 1.0
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// See 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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//
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// See http://boostorg.github.com/compute for more information.
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//---------------------------------------------------------------------------//
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#ifndef BOOST_COMPUTE_FUNCTIONAL_BIND_HPP
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#define BOOST_COMPUTE_FUNCTIONAL_BIND_HPP
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#include <boost/mpl/int.hpp>
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#include <boost/tuple/tuple.hpp>
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#include <boost/type_traits/conditional.hpp>
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#include <boost/compute/config.hpp>
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#include <boost/compute/detail/meta_kernel.hpp>
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namespace boost {
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namespace compute {
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namespace placeholders {
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/// \internal_
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template<int I>
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struct placeholder : boost::integral_constant<int, I>
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{
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placeholder() { }
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};
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placeholder<0> const _1;
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placeholder<1> const _2;
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} // end placeholders namespace
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/// Meta-function returning \c true if \c T is a placeholder type.
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template<class T>
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struct is_placeholder : boost::false_type
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{
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};
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/// \internal_
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template<int I>
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struct is_placeholder<placeholders::placeholder<I> > : boost::true_type
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{
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};
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namespace detail {
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template<class Function, class BoundArgs, class Args>
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struct invoked_bound_function
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{
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invoked_bound_function(Function f, BoundArgs bound_args, Args args)
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: m_function(f),
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m_bound_args(bound_args),
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m_args(args)
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{
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}
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// meta-function returning true if the N'th argument is a placeholder
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template<int N>
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struct is_placeholder_arg
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{
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typedef typename boost::tuples::element<N, BoundArgs>::type nth_bound_arg;
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typedef typename is_placeholder<nth_bound_arg>::type type;
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static const bool value = is_placeholder<nth_bound_arg>::value;
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};
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template<class Arg>
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struct get_arg_type
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{
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typedef Arg type;
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};
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template<int I>
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struct get_arg_type<placeholders::placeholder<I> >
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{
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typedef typename boost::tuples::element<I, Args>::type type;
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};
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// meta-function returning the type of the N'th argument when invoked
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template<int N>
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struct get_nth_arg_type
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{
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typedef typename boost::tuples::element<N, BoundArgs>::type nth_bound_arg;
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typedef typename get_arg_type<nth_bound_arg>::type type;
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};
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template<int N>
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typename get_nth_arg_type<N>::type get_nth_arg(
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typename boost::enable_if_c<is_placeholder_arg<N>::value>::type* = 0
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) const
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{
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typedef typename boost::tuples::element<N, BoundArgs>::type nth_bound_arg;
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return boost::get<nth_bound_arg::value>(m_args);
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}
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template<int N>
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typename get_nth_arg_type<N>::type get_nth_arg(
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typename boost::disable_if_c<is_placeholder_arg<N>::value>::type* = 0
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) const
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{
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return boost::get<N>(m_bound_args);
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}
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Function m_function;
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BoundArgs m_bound_args;
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Args m_args;
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};
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template<class Function, class BoundArgs, class Args>
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inline meta_kernel& apply_invoked_bound_function(
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meta_kernel &k,
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const invoked_bound_function<Function, BoundArgs, Args> &expr,
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typename boost::enable_if_c<
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boost::tuples::length<BoundArgs>::value == 1
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>::type* = 0
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)
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{
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return k << expr.m_function(expr.template get_nth_arg<0>());
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}
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template<class Function, class BoundArgs, class Args>
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inline meta_kernel& apply_invoked_bound_function(
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meta_kernel &k,
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const invoked_bound_function<Function, BoundArgs, Args> &expr,
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typename boost::enable_if_c<
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boost::tuples::length<BoundArgs>::value == 2
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>::type* = 0
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)
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{
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return k << expr.m_function(expr.template get_nth_arg<0>(),
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expr.template get_nth_arg<1>());
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}
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template<class Function, class BoundArgs, class Args>
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inline meta_kernel& apply_invoked_bound_function(
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meta_kernel &k,
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const invoked_bound_function<Function, BoundArgs, Args> &expr,
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typename boost::enable_if_c<
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boost::tuples::length<BoundArgs>::value == 3
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>::type* = 0
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)
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{
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return k << expr.m_function(expr.template get_nth_arg<0>(),
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expr.template get_nth_arg<1>(),
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expr.template get_nth_arg<2>());
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}
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template<class Function, class BoundArgs, class Args>
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inline meta_kernel& operator<<(
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meta_kernel &k,
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const invoked_bound_function<Function, BoundArgs, Args> &expr
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)
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{
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return apply_invoked_bound_function(k, expr);
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}
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template<class Function, class BoundArgs>
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struct bound_function
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{
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typedef int result_type;
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bound_function(Function f, BoundArgs args)
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: m_function(f),
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m_args(args)
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{
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}
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template<class Arg1>
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detail::invoked_bound_function<
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Function,
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BoundArgs,
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boost::tuple<Arg1>
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>
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operator()(const Arg1 &arg1) const
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{
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return detail::invoked_bound_function<
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Function,
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BoundArgs,
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boost::tuple<Arg1>
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>(m_function, m_args, boost::make_tuple(arg1));
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}
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template<class Arg1, class Arg2>
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detail::invoked_bound_function<
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Function,
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BoundArgs,
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boost::tuple<Arg1, Arg2>
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>
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operator()(const Arg1 &arg1, const Arg2 &arg2) const
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{
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return detail::invoked_bound_function<
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Function,
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BoundArgs,
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boost::tuple<Arg1, Arg2>
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>(m_function, m_args, boost::make_tuple(arg1, arg2));
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}
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Function m_function;
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BoundArgs m_args;
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};
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} // end detail namespace
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#if !defined(BOOST_COMPUTE_NO_VARIADIC_TEMPLATES) || defined(BOOST_COMPUTE_DOXYGEN_INVOKED)
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/// Returns a function wrapper which invokes \p f with \p args when called.
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///
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/// For example, to generate a unary function object which returns \c true
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/// when its argument is less than \c 7:
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/// \code
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/// using boost::compute::less;
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/// using boost::compute::placeholders::_1;
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///
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/// auto less_than_seven = boost::compute::bind(less<int>(), _1, 7);
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/// \endcode
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template<class F, class... Args>
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inline detail::bound_function<F, boost::tuple<Args...> >
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bind(F f, Args... args)
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{
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typedef typename boost::tuple<Args...> ArgsTuple;
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return detail::bound_function<F, ArgsTuple>(f, boost::make_tuple(args...));
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}
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#else
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template<class F, class A1>
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inline detail::bound_function<F, boost::tuple<A1> >
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bind(F f, A1 a1)
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{
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typedef typename boost::tuple<A1> Args;
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return detail::bound_function<F, Args>(f, boost::make_tuple(a1));
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}
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template<class F, class A1, class A2>
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inline detail::bound_function<F, boost::tuple<A1, A2> >
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bind(F f, A1 a1, A2 a2)
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{
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typedef typename boost::tuple<A1, A2> Args;
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return detail::bound_function<F, Args>(f, boost::make_tuple(a1, a2));
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}
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template<class F, class A1, class A2, class A3>
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inline detail::bound_function<F, boost::tuple<A1, A2, A3> >
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bind(F f, A1 a1, A2 a2, A3 a3)
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{
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typedef typename boost::tuple<A1, A2, A3> Args;
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return detail::bound_function<F, Args>(f, boost::make_tuple(a1, a2, a3));
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}
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#endif // BOOST_COMPUTE_NO_VARIADIC_TEMPLATES
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} // end compute namespace
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} // end boost namespace
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#endif // BOOST_COMPUTE_FUNCTIONAL_BIND_HPP
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