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506 lines
14 KiB
C++
506 lines
14 KiB
C++
// Boost Lambda Library -- loops.hpp ----------------------------------------
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// Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
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// Copyright (C) 2000 Gary Powell (powellg@amazon.com)
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// Copyright (c) 2001-2002 Joel de Guzman
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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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//
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// For more information, see www.boost.org
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// --------------------------------------------------------------------------
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#if !defined(BOOST_LAMBDA_LOOPS_HPP)
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#define BOOST_LAMBDA_LOOPS_HPP
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#include "boost/lambda/core.hpp"
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namespace boost {
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namespace lambda {
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// -- loop control structure actions ----------------------
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class forloop_action {};
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class forloop_no_body_action {};
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class whileloop_action {};
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class whileloop_no_body_action {};
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class dowhileloop_action {};
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class dowhileloop_no_body_action {};
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// For loop
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template <class Arg1, class Arg2, class Arg3, class Arg4>
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inline const
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lambda_functor<
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lambda_functor_base<
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forloop_action,
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tuple<lambda_functor<Arg1>, lambda_functor<Arg2>,
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lambda_functor<Arg3>, lambda_functor<Arg4> >
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>
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>
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for_loop(const lambda_functor<Arg1>& a1, const lambda_functor<Arg2>& a2,
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const lambda_functor<Arg3>& a3, const lambda_functor<Arg4>& a4) {
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return
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lambda_functor_base<
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forloop_action,
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tuple<lambda_functor<Arg1>, lambda_functor<Arg2>,
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lambda_functor<Arg3>, lambda_functor<Arg4> >
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>
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( tuple<lambda_functor<Arg1>, lambda_functor<Arg2>,
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lambda_functor<Arg3>, lambda_functor<Arg4> >(a1, a2, a3, a4)
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);
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}
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// No body case.
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template <class Arg1, class Arg2, class Arg3>
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inline const
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lambda_functor<
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lambda_functor_base<
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forloop_no_body_action,
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tuple<lambda_functor<Arg1>, lambda_functor<Arg2>, lambda_functor<Arg3> >
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>
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>
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for_loop(const lambda_functor<Arg1>& a1, const lambda_functor<Arg2>& a2,
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const lambda_functor<Arg3>& a3) {
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return
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lambda_functor_base<
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forloop_no_body_action,
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tuple<lambda_functor<Arg1>, lambda_functor<Arg2>,
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lambda_functor<Arg3> >
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>
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( tuple<lambda_functor<Arg1>, lambda_functor<Arg2>,
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lambda_functor<Arg3> >(a1, a2, a3) );
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}
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// While loop
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template <class Arg1, class Arg2>
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inline const
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lambda_functor<
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lambda_functor_base<
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whileloop_action,
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tuple<lambda_functor<Arg1>, lambda_functor<Arg2> >
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>
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>
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while_loop(const lambda_functor<Arg1>& a1, const lambda_functor<Arg2>& a2) {
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return
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lambda_functor_base<
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whileloop_action,
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tuple<lambda_functor<Arg1>, lambda_functor<Arg2> >
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>
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( tuple<lambda_functor<Arg1>, lambda_functor<Arg2> >(a1, a2));
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}
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// No body case.
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template <class Arg1>
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inline const
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lambda_functor<
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lambda_functor_base<
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whileloop_no_body_action,
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tuple<lambda_functor<Arg1> >
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>
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>
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while_loop(const lambda_functor<Arg1>& a1) {
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return
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lambda_functor_base<
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whileloop_no_body_action,
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tuple<lambda_functor<Arg1> >
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>
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( tuple<lambda_functor<Arg1> >(a1) );
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}
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// Do While loop
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template <class Arg1, class Arg2>
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inline const
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lambda_functor<
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lambda_functor_base<
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dowhileloop_action,
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tuple<lambda_functor<Arg1>, lambda_functor<Arg2> >
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>
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>
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do_while_loop(const lambda_functor<Arg1>& a1, const lambda_functor<Arg2>& a2) {
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return
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lambda_functor_base<
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dowhileloop_action,
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tuple<lambda_functor<Arg1>, lambda_functor<Arg2> >
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>
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( tuple<lambda_functor<Arg1>, lambda_functor<Arg2> >(a1, a2));
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}
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// No body case.
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template <class Arg1>
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inline const
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lambda_functor<
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lambda_functor_base<
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dowhileloop_no_body_action,
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tuple<lambda_functor<Arg1> >
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>
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>
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do_while_loop(const lambda_functor<Arg1>& a1) {
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return
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lambda_functor_base<
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dowhileloop_no_body_action,
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tuple<lambda_functor<Arg1> >
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>
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( tuple<lambda_functor<Arg1> >(a1));
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}
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// Control loop lambda_functor_base specializations.
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// Specialization for for_loop.
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template<class Args>
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class
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lambda_functor_base<forloop_action, Args> {
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public:
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Args args;
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template <class T> struct sig { typedef void type; };
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public:
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explicit lambda_functor_base(const Args& a) : args(a) {}
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template<class RET, CALL_TEMPLATE_ARGS>
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RET call(CALL_FORMAL_ARGS) const {
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for(detail::select(boost::tuples::get<0>(args), CALL_ACTUAL_ARGS);
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detail::select(boost::tuples::get<1>(args), CALL_ACTUAL_ARGS);
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detail::select(boost::tuples::get<2>(args), CALL_ACTUAL_ARGS))
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detail::select(boost::tuples::get<3>(args), CALL_ACTUAL_ARGS);
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}
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};
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// No body case
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template<class Args>
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class
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lambda_functor_base<forloop_no_body_action, Args> {
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public:
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Args args;
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template <class T> struct sig { typedef void type; };
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public:
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explicit lambda_functor_base(const Args& a) : args(a) {}
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template<class RET, CALL_TEMPLATE_ARGS>
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RET call(CALL_FORMAL_ARGS) const {
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for(detail::select(boost::tuples::get<0>(args), CALL_ACTUAL_ARGS);
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detail::select(boost::tuples::get<1>(args), CALL_ACTUAL_ARGS);
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detail::select(boost::tuples::get<2>(args), CALL_ACTUAL_ARGS)) {}
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}
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};
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// Specialization for while_loop.
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template<class Args>
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class
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lambda_functor_base<whileloop_action, Args> {
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public:
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Args args;
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template <class T> struct sig { typedef void type; };
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public:
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explicit lambda_functor_base(const Args& a) : args(a) {}
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template<class RET, CALL_TEMPLATE_ARGS>
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RET call(CALL_FORMAL_ARGS) const {
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while(detail::select(boost::tuples::get<0>(args), CALL_ACTUAL_ARGS))
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detail::select(boost::tuples::get<1>(args), CALL_ACTUAL_ARGS);
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}
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};
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// No body case
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template<class Args>
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class
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lambda_functor_base<whileloop_no_body_action, Args> {
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public:
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Args args;
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template <class T> struct sig { typedef void type; };
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public:
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explicit lambda_functor_base(const Args& a) : args(a) {}
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template<class RET, CALL_TEMPLATE_ARGS>
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RET call(CALL_FORMAL_ARGS) const {
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while(detail::select(boost::tuples::get<0>(args), CALL_ACTUAL_ARGS)) {}
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}
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};
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// Specialization for do_while_loop.
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// Note that the first argument is the condition.
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template<class Args>
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class
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lambda_functor_base<dowhileloop_action, Args> {
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public:
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Args args;
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template <class T> struct sig { typedef void type; };
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public:
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explicit lambda_functor_base(const Args& a) : args(a) {}
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template<class RET, CALL_TEMPLATE_ARGS>
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RET call(CALL_FORMAL_ARGS) const {
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do {
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detail::select(boost::tuples::get<1>(args), CALL_ACTUAL_ARGS);
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} while (detail::select(boost::tuples::get<0>(args), CALL_ACTUAL_ARGS) );
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}
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};
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// No body case
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template<class Args>
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class
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lambda_functor_base<dowhileloop_no_body_action, Args> {
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public:
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Args args;
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template <class T> struct sig { typedef void type; };
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public:
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explicit lambda_functor_base(const Args& a) : args(a) {}
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template<class RET, CALL_TEMPLATE_ARGS>
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RET call(CALL_FORMAL_ARGS) const {
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do {} while (detail::select(boost::tuples::get<0>(args), CALL_ACTUAL_ARGS) );
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}
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};
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// The code below is from Joel de Guzman, some name changes etc.
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// has been made.
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///////////////////////////////////////////////////////////////////////////////
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//
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// while_composite
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//
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// This composite has the form:
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//
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// while_(condition)
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// [
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// statement
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// ]
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//
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// While the condition (an lambda_functor) evaluates to true, statement
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// (another lambda_functor) is executed. The result type of this is void.
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// Note the trailing underscore after while_.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename CondT, typename DoT>
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struct while_composite {
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typedef while_composite<CondT, DoT> self_t;
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template <class SigArgs>
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struct sig { typedef void type; };
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while_composite(CondT const& cond_, DoT const& do__)
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: cond(cond_), do_(do__) {}
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template <class Ret, CALL_TEMPLATE_ARGS>
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Ret call(CALL_FORMAL_ARGS) const
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{
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while (cond.internal_call(CALL_ACTUAL_ARGS))
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do_.internal_call(CALL_ACTUAL_ARGS);
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}
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CondT cond;
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DoT do_;
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};
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//////////////////////////////////
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template <typename CondT>
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struct while_gen {
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while_gen(CondT const& cond_)
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: cond(cond_) {}
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template <typename DoT>
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lambda_functor<while_composite<
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typename as_lambda_functor<CondT>::type,
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typename as_lambda_functor<DoT>::type> >
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operator[](DoT const& do_) const
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{
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typedef while_composite<
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typename as_lambda_functor<CondT>::type,
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typename as_lambda_functor<DoT>::type>
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result;
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return result(
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to_lambda_functor(cond),
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to_lambda_functor(do_));
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}
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CondT cond;
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};
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//////////////////////////////////
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template <typename CondT>
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inline while_gen<CondT>
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while_(CondT const& cond)
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{
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return while_gen<CondT>(cond);
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// do_composite
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//
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// This composite has the form:
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//
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// do_
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// [
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// statement
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// ]
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// .while_(condition)
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//
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// While the condition (an lambda_functor) evaluates to true, statement
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// (another lambda_functor) is executed. The statement is executed at least
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// once. The result type of this is void. Note the trailing
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// underscore after do_ and the leading dot and the trailing
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// underscore before and after .while_.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename DoT, typename CondT>
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struct do_composite {
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typedef do_composite<DoT, CondT> self_t;
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template <class SigArgs>
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struct sig { typedef void type; };
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do_composite(DoT const& do__, CondT const& cond_)
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: do_(do__), cond(cond_) {}
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template <class Ret, CALL_TEMPLATE_ARGS>
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Ret call(CALL_FORMAL_ARGS) const
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{
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do
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do_.internal_call(CALL_ACTUAL_ARGS);
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while (cond.internal_call(CALL_ACTUAL_ARGS));
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}
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DoT do_;
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CondT cond;
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};
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////////////////////////////////////
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template <typename DoT>
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struct do_gen2 {
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do_gen2(DoT const& do__)
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: do_(do__) {}
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template <typename CondT>
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lambda_functor<do_composite<
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typename as_lambda_functor<DoT>::type,
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typename as_lambda_functor<CondT>::type> >
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while_(CondT const& cond) const
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{
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typedef do_composite<
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typename as_lambda_functor<DoT>::type,
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typename as_lambda_functor<CondT>::type>
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result;
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return result(
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to_lambda_functor(do_),
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to_lambda_functor(cond));
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}
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DoT do_;
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};
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////////////////////////////////////
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struct do_gen {
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template <typename DoT>
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do_gen2<DoT>
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operator[](DoT const& do_) const
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{
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return do_gen2<DoT>(do_);
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}
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};
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do_gen const do_ = do_gen();
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///////////////////////////////////////////////////////////////////////////////
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//
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// for_composite
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//
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// This statement has the form:
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//
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// for_(init, condition, step)
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// [
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// statement
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// ]
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//
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// Where init, condition, step and statement are all lambda_functors. init
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// is executed once before entering the for-loop. The for-loop
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// exits once condition evaluates to false. At each loop iteration,
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// step and statement is called. The result of this statement is
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// void. Note the trailing underscore after for_.
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//
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///////////////////////////////////////////////////////////////////////////////
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template <typename InitT, typename CondT, typename StepT, typename DoT>
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struct for_composite {
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template <class SigArgs>
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struct sig { typedef void type; };
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for_composite(
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InitT const& init_,
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CondT const& cond_,
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StepT const& step_,
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DoT const& do__)
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: init(init_), cond(cond_), step(step_), do_(do__) {}
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template <class Ret, CALL_TEMPLATE_ARGS>
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Ret
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call(CALL_FORMAL_ARGS) const
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{
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for (init.internal_call(CALL_ACTUAL_ARGS); cond.internal_call(CALL_ACTUAL_ARGS); step.internal_call(CALL_ACTUAL_ARGS))
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do_.internal_call(CALL_ACTUAL_ARGS);
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}
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InitT init; CondT cond; StepT step; DoT do_; // lambda_functors
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};
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//////////////////////////////////
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template <typename InitT, typename CondT, typename StepT>
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struct for_gen {
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for_gen(
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InitT const& init_,
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CondT const& cond_,
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StepT const& step_)
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: init(init_), cond(cond_), step(step_) {}
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template <typename DoT>
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lambda_functor<for_composite<
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typename as_lambda_functor<InitT>::type,
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typename as_lambda_functor<CondT>::type,
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typename as_lambda_functor<StepT>::type,
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typename as_lambda_functor<DoT>::type> >
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operator[](DoT const& do_) const
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{
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typedef for_composite<
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typename as_lambda_functor<InitT>::type,
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typename as_lambda_functor<CondT>::type,
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typename as_lambda_functor<StepT>::type,
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typename as_lambda_functor<DoT>::type>
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result;
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return result(
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to_lambda_functor(init),
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to_lambda_functor(cond),
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to_lambda_functor(step),
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to_lambda_functor(do_));
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}
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InitT init; CondT cond; StepT step;
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};
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//////////////////////////////////
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template <typename InitT, typename CondT, typename StepT>
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inline for_gen<InitT, CondT, StepT>
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for_(InitT const& init, CondT const& cond, StepT const& step)
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{
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return for_gen<InitT, CondT, StepT>(init, cond, step);
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}
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} // lambda
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} // boost
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#endif // BOOST_LAMBDA_LOOPS_HPP
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