author | William Roberts <williamr@symbian.org> |
Fri, 23 Jul 2010 16:09:54 +0100 | |
branch | GCC_SURGE |
changeset 47 | d7383dba13ba |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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// Boost Lambda Library -- control_structures_impl.hpp --------------------- |
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// Copyright (C) 1999, 2000 Jaakko Järvi (jaakko.jarvi@cs.utu.fi) |
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// Copyright (C) 2000 Gary Powell (powellg@amazon.com) |
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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_CONTROL_CONSTRUCTS_HPP) |
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#define BOOST_LAMBDA_CONTROL_CONSTRUCTS_HPP |
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namespace boost { |
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namespace lambda { |
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// -- void return control actions ---------------------- |
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class forloop_action {}; |
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class forloop_no_body_action {}; |
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class ifthen_action {}; |
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class ifthenelse_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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// -- nonvoid return control actions ---------------------- |
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class ifthenelsereturn_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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|
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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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|
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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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|
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// If Then |
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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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ifthen_action, |
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tuple<lambda_functor<Arg1>, lambda_functor<Arg2> > |
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> |
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> |
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if_then(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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ifthen_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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|
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// If then else |
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|
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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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ifthenelse_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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if_then_else(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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ifthenelse_action, |
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tuple<lambda_functor<Arg1>, lambda_functor<Arg2>, lambda_functor<Arg3> > |
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> |
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(tuple<lambda_functor<Arg1>, lambda_functor<Arg2>, lambda_functor<Arg3> > |
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(a1, a2, a3) ); |
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} |
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|
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// Our version of operator?:() |
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|
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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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other_action<ifthenelsereturn_action>, |
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tuple<lambda_functor<Arg1>, |
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typename const_copy_argument<Arg2>::type, |
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typename const_copy_argument<Arg3>::type> |
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> |
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> |
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if_then_else_return(const lambda_functor<Arg1>& a1, |
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const Arg2 & a2, |
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const Arg3 & a3) { |
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return |
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lambda_functor_base< |
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other_action<ifthenelsereturn_action>, |
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tuple<lambda_functor<Arg1>, |
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typename const_copy_argument<Arg2>::type, |
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typename const_copy_argument<Arg3>::type> |
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> ( tuple<lambda_functor<Arg1>, |
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typename const_copy_argument<Arg2>::type, |
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typename const_copy_argument<Arg3>::type> (a1, a2, a3) ); |
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} |
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namespace detail { |
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// return type specialization for conditional expression begins ----------- |
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// start reading below and move upwards |
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// PHASE 6:1 |
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// check if A is conbertible to B and B to A |
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template<int Phase, bool AtoB, bool BtoA, bool SameType, class A, class B> |
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struct return_type_2_ifthenelsereturn; |
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// if A can be converted to B and vice versa -> ambiguous |
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template<int Phase, class A, class B> |
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struct return_type_2_ifthenelsereturn<Phase, true, true, false, A, B> { |
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typedef |
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detail::return_type_deduction_failure<return_type_2_ifthenelsereturn> type; |
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// ambiguous type in conditional expression |
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}; |
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// if A can be converted to B and vice versa and are of same type |
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template<int Phase, class A, class B> |
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struct return_type_2_ifthenelsereturn<Phase, true, true, true, A, B> { |
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typedef A type; |
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}; |
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|
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|
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// A can be converted to B |
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template<int Phase, class A, class B> |
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struct return_type_2_ifthenelsereturn<Phase, true, false, false, A, B> { |
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typedef B type; |
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}; |
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|
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// B can be converted to A |
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template<int Phase, class A, class B> |
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struct return_type_2_ifthenelsereturn<Phase, false, true, false, A, B> { |
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typedef A type; |
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}; |
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|
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// neither can be converted. Then we drop the potential references, and |
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// try again |
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template<class A, class B> |
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struct return_type_2_ifthenelsereturn<1, false, false, false, A, B> { |
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// it is safe to add const, since the result will be an rvalue and thus |
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// const anyway. The const are needed eg. if the types |
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// are 'const int*' and 'void *'. The remaining type should be 'const void*' |
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typedef const typename boost::remove_reference<A>::type plainA; |
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typedef const typename boost::remove_reference<B>::type plainB; |
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// TODO: Add support for volatile ? |
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|
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typedef typename |
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return_type_2_ifthenelsereturn< |
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2, |
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boost::is_convertible<plainA,plainB>::value, |
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boost::is_convertible<plainB,plainA>::value, |
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boost::is_same<plainA,plainB>::value, |
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plainA, |
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plainB>::type type; |
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}; |
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|
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// PHASE 6:2 |
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template<class A, class B> |
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struct return_type_2_ifthenelsereturn<2, false, false, false, A, B> { |
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typedef |
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detail::return_type_deduction_failure<return_type_2_ifthenelsereturn> type; |
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// types_do_not_match_in_conditional_expression |
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}; |
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|
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|
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|
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// PHASE 5: now we know that types are not arithmetic. |
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template<class A, class B> |
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struct non_numeric_types { |
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typedef typename |
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return_type_2_ifthenelsereturn< |
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1, // phase 1 |
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is_convertible<A,B>::value, |
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is_convertible<B,A>::value, |
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is_same<A,B>::value, |
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A, |
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B>::type type; |
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}; |
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|
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// PHASE 4 : |
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// the base case covers arithmetic types with differing promote codes |
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// use the type deduction of arithmetic_actions |
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template<int CodeA, int CodeB, class A, class B> |
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struct arithmetic_or_not { |
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typedef typename |
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return_type_2<arithmetic_action<plus_action>, A, B>::type type; |
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// plus_action is just a random pick, has to be a concrete instance |
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}; |
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|
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// this case covers the case of artihmetic types with the same promote codes. |
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// non numeric deduction is used since e.g. integral promotion is not |
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// performed with operator ?: |
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template<int CodeA, class A, class B> |
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struct arithmetic_or_not<CodeA, CodeA, A, B> { |
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typedef typename non_numeric_types<A, B>::type type; |
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}; |
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// if either A or B has promote code -1 it is not an arithmetic type |
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template<class A, class B> |
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struct arithmetic_or_not <-1, -1, A, B> { |
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typedef typename non_numeric_types<A, B>::type type; |
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}; |
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template<int CodeB, class A, class B> |
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struct arithmetic_or_not <-1, CodeB, A, B> { |
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typedef typename non_numeric_types<A, B>::type type; |
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}; |
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template<int CodeA, class A, class B> |
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struct arithmetic_or_not <CodeA, -1, A, B> { |
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typedef typename non_numeric_types<A, B>::type type; |
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}; |
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|
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|
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|
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|
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// PHASE 3 : Are the types same? |
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// No, check if they are arithmetic or not |
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template <class A, class B> |
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struct same_or_not { |
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typedef typename detail::remove_reference_and_cv<A>::type plainA; |
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typedef typename detail::remove_reference_and_cv<B>::type plainB; |
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|
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typedef typename |
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arithmetic_or_not< |
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detail::promote_code<plainA>::value, |
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detail::promote_code<plainB>::value, |
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A, |
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B>::type type; |
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}; |
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// Yes, clear. |
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template <class A> struct same_or_not<A, A> { |
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typedef A type; |
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}; |
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|
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} // detail |
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|
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// PHASE 2 : Perform first the potential array_to_pointer conversion |
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template<class A, class B> |
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struct return_type_2<other_action<ifthenelsereturn_action>, A, B> { |
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|
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typedef typename detail::array_to_pointer<A>::type A1; |
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typedef typename detail::array_to_pointer<B>::type B1; |
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359 |
|
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typedef typename |
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boost::add_const<typename detail::same_or_not<A1, B1>::type>::type type; |
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}; |
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|
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// PHASE 1 : Deduction is based on the second and third operand |
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|
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|
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// return type specialization for conditional expression ends ----------- |
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|
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|
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|
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// Control loop lambda_functor_base specializations. |
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|
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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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|
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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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detail::select(boost::tuples::get<3>(args), CALL_ACTUAL_ARGS); |
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} |
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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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|
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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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|
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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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|
417 |
public: |
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418 |
Args args; |
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419 |
template <class T> struct sig { typedef void type; }; |
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420 |
public: |
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421 |
explicit lambda_functor_base(const Args& a) : args(a) {} |
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422 |
|
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423 |
template<class RET, CALL_TEMPLATE_ARGS> |
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424 |
RET call(CALL_FORMAL_ARGS) const { |
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425 |
while(detail::select(boost::tuples::get<0>(args), CALL_ACTUAL_ARGS)) |
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|
426 |
|
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|
427 |
detail::select(boost::tuples::get<1>(args), CALL_ACTUAL_ARGS); |
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|
428 |
} |
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429 |
}; |
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|
430 |
|
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431 |
// No body case |
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432 |
template<class Args> |
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433 |
class |
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434 |
lambda_functor_base<whileloop_no_body_action, Args> { |
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435 |
public: |
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436 |
Args args; |
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437 |
template <class T> struct sig { typedef void type; }; |
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438 |
public: |
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439 |
explicit lambda_functor_base(const Args& a) : args(a) {} |
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440 |
|
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441 |
template<class RET, CALL_TEMPLATE_ARGS> |
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442 |
RET call(CALL_FORMAL_ARGS) const { |
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443 |
while(detail::select(boost::tuples::get<0>(args), CALL_ACTUAL_ARGS)) {} |
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444 |
} |
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445 |
}; |
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446 |
|
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447 |
// Specialization for do_while_loop. |
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448 |
// Note that the first argument is the condition. |
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449 |
template<class Args> |
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450 |
class |
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451 |
lambda_functor_base<dowhileloop_action, Args> { |
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452 |
public: |
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453 |
Args args; |
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454 |
template <class T> struct sig { typedef void type; }; |
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455 |
public: |
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456 |
explicit lambda_functor_base(const Args& a) : args(a) {} |
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457 |
|
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458 |
template<class RET, CALL_TEMPLATE_ARGS> |
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459 |
RET call(CALL_FORMAL_ARGS) const { |
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460 |
do { |
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461 |
detail::select(boost::tuples::get<1>(args), CALL_ACTUAL_ARGS); |
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462 |
} while (detail::select(boost::tuples::get<0>(args), CALL_ACTUAL_ARGS) ); |
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463 |
} |
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464 |
}; |
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465 |
|
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466 |
// No body case |
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467 |
template<class Args> |
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468 |
class |
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469 |
lambda_functor_base<dowhileloop_no_body_action, Args> { |
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470 |
public: |
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471 |
Args args; |
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472 |
template <class T> struct sig { typedef void type; }; |
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473 |
public: |
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explicit lambda_functor_base(const Args& a) : args(a) {} |
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475 |
|
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476 |
template<class RET, CALL_TEMPLATE_ARGS> |
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477 |
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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479 |
} |
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480 |
}; |
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481 |
|
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|
482 |
|
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483 |
// Specialization for if_then. |
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484 |
template<class Args> |
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485 |
class |
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486 |
lambda_functor_base<ifthen_action, Args> { |
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487 |
public: |
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Args args; |
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489 |
template <class T> struct sig { typedef void type; }; |
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490 |
public: |
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491 |
explicit lambda_functor_base(const Args& a) : args(a) {} |
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492 |
|
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493 |
template<class RET, CALL_TEMPLATE_ARGS> |
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494 |
RET call(CALL_FORMAL_ARGS) const { |
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495 |
if (detail::select(boost::tuples::get<0>(args), CALL_ACTUAL_ARGS)) detail::select(boost::tuples::get<1>(args), CALL_ACTUAL_ARGS); |
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496 |
} |
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497 |
}; |
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498 |
|
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499 |
// Specialization for if_then_else. |
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500 |
template<class Args> |
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501 |
class |
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502 |
lambda_functor_base<ifthenelse_action, Args> { |
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503 |
public: |
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504 |
Args args; |
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505 |
template <class T> struct sig { typedef void type; }; |
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506 |
public: |
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507 |
explicit lambda_functor_base(const Args& a) : args(a) {} |
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|
508 |
|
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509 |
template<class RET, CALL_TEMPLATE_ARGS> |
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510 |
RET call(CALL_FORMAL_ARGS) const { |
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511 |
if (detail::select(boost::tuples::get<0>(args), CALL_ACTUAL_ARGS)) |
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|
512 |
detail::select(boost::tuples::get<1>(args), CALL_ACTUAL_ARGS); |
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513 |
else |
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514 |
detail::select(boost::tuples::get<2>(args), CALL_ACTUAL_ARGS); |
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515 |
} |
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516 |
}; |
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|
517 |
|
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518 |
// Specialization of lambda_functor_base for if_then_else_return. |
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Revision: 201002
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519 |
template<class Args> |
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520 |
class |
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lambda_functor_base<other_action<ifthenelsereturn_action>, Args> { |
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public: |
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Args args; |
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template <class SigArgs> struct sig { |
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private: |
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typedef typename detail::nth_return_type_sig<1, Args, SigArgs>::type ret1; |
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typedef typename detail::nth_return_type_sig<2, Args, SigArgs>::type ret2; |
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public: |
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typedef typename return_type_2< |
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other_action<ifthenelsereturn_action>, ret1, ret2 |
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>::type type; |
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}; |
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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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return (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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detail::select(boost::tuples::get<2>(args), CALL_ACTUAL_ARGS); |
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} |
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}; |
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} // lambda |
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} // boost |
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|
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#endif // BOOST_LAMBDA_CONTROL_CONSTRUCTS_HPP |