author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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// Boost Lambda Library - lambda_functors.hpp ------------------------------- |
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// Copyright (C) 1999, 2000 Jaakko Järvi (jaakko.jarvi@cs.utu.fi) |
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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 http://www.boost.org |
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// ------------------------------------------------ |
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#ifndef BOOST_LAMBDA_LAMBDA_FUNCTORS_HPP |
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#define BOOST_LAMBDA_LAMBDA_FUNCTORS_HPP |
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namespace boost { |
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namespace lambda { |
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// -- lambda_functor -------------------------------------------- |
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// -------------------------------------------------------------- |
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//inline const null_type const_null_type() { return null_type(); } |
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namespace detail { |
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namespace { |
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static const null_type constant_null_type = null_type(); |
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} // unnamed |
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} // detail |
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class unused {}; |
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#define cnull_type() detail::constant_null_type |
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// -- free variables types -------------------------------------------------- |
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// helper to work around the case where the nullary return type deduction |
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// is always performed, even though the functor is not nullary |
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namespace detail { |
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template<int N, class Tuple> struct get_element_or_null_type { |
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typedef typename |
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detail::tuple_element_as_reference<N, Tuple>::type type; |
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}; |
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template<int N> struct get_element_or_null_type<N, null_type> { |
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typedef null_type type; |
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}; |
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} |
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template <int I> struct placeholder; |
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template<> struct placeholder<FIRST> { |
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template<class SigArgs> struct sig { |
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typedef typename detail::get_element_or_null_type<0, SigArgs>::type type; |
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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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BOOST_STATIC_ASSERT(boost::is_reference<RET>::value); |
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CALL_USE_ARGS; // does nothing, prevents warnings for unused args |
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return a; |
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} |
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}; |
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template<> struct placeholder<SECOND> { |
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template<class SigArgs> struct sig { |
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typedef typename detail::get_element_or_null_type<1, SigArgs>::type type; |
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}; |
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template<class RET, CALL_TEMPLATE_ARGS> |
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RET call(CALL_FORMAL_ARGS) const { CALL_USE_ARGS; return b; } |
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}; |
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template<> struct placeholder<THIRD> { |
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template<class SigArgs> struct sig { |
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typedef typename detail::get_element_or_null_type<2, SigArgs>::type type; |
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}; |
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template<class RET, CALL_TEMPLATE_ARGS> |
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RET call(CALL_FORMAL_ARGS) const { CALL_USE_ARGS; return c; } |
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}; |
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template<> struct placeholder<EXCEPTION> { |
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template<class SigArgs> struct sig { |
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typedef typename detail::get_element_or_null_type<3, SigArgs>::type type; |
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}; |
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template<class RET, CALL_TEMPLATE_ARGS> |
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RET call(CALL_FORMAL_ARGS) const { CALL_USE_ARGS; return env; } |
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}; |
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typedef const lambda_functor<placeholder<FIRST> > placeholder1_type; |
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typedef const lambda_functor<placeholder<SECOND> > placeholder2_type; |
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typedef const lambda_functor<placeholder<THIRD> > placeholder3_type; |
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/////////////////////////////////////////////////////////////////////////////// |
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// free variables are lambda_functors. This is to allow uniform handling with |
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// other lambda_functors. |
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// ------------------------------------------------------------------- |
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// -- lambda_functor NONE ------------------------------------------------ |
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template <class T> |
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class lambda_functor : public T |
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{ |
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BOOST_STATIC_CONSTANT(int, arity_bits = get_arity<T>::value); |
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public: |
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typedef T inherited; |
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lambda_functor() {} |
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lambda_functor(const lambda_functor& l) : inherited(l) {} |
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122 |
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lambda_functor(const T& t) : inherited(t) {} |
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template <class SigArgs> struct sig { |
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typedef typename inherited::template |
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sig<typename SigArgs::tail_type>::type type; |
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}; |
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129 |
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// Note that this return type deduction template is instantiated, even |
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// if the nullary |
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// operator() is not called at all. One must make sure that it does not fail. |
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typedef typename |
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inherited::template sig<null_type>::type |
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nullary_return_type; |
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nullary_return_type operator()() const { |
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return inherited::template |
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call<nullary_return_type> |
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(cnull_type(), cnull_type(), cnull_type(), cnull_type()); |
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} |
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template<class A> |
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typename inherited::template sig<tuple<A&> >::type |
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operator()(A& a) const { |
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return inherited::template call< |
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typename inherited::template sig<tuple<A&> >::type |
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>(a, cnull_type(), cnull_type(), cnull_type()); |
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} |
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template<class A, class B> |
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typename inherited::template sig<tuple<A&, B&> >::type |
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operator()(A& a, B& b) const { |
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return inherited::template call< |
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typename inherited::template sig<tuple<A&, B&> >::type |
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>(a, b, cnull_type(), cnull_type()); |
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} |
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158 |
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template<class A, class B, class C> |
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typename inherited::template sig<tuple<A&, B&, C&> >::type |
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operator()(A& a, B& b, C& c) const |
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{ |
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return inherited::template call< |
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typename inherited::template sig<tuple<A&, B&, C&> >::type |
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>(a, b, c, cnull_type()); |
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} |
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|
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// for internal calls with env |
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template<CALL_TEMPLATE_ARGS> |
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typename inherited::template sig<tuple<CALL_REFERENCE_TYPES> >::type |
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internal_call(CALL_FORMAL_ARGS) const { |
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return inherited::template |
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call<typename inherited::template |
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sig<tuple<CALL_REFERENCE_TYPES> >::type>(CALL_ACTUAL_ARGS); |
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} |
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template<class A> |
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const lambda_functor<lambda_functor_base< |
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other_action<assignment_action>, |
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boost::tuple<lambda_functor, |
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typename const_copy_argument <const A>::type> > > |
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operator=(const A& a) const { |
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return lambda_functor_base< |
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other_action<assignment_action>, |
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boost::tuple<lambda_functor, |
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typename const_copy_argument <const A>::type> > |
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( boost::tuple<lambda_functor, |
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typename const_copy_argument <const A>::type>(*this, a) ); |
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} |
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template<class A> |
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const lambda_functor<lambda_functor_base< |
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other_action<subscript_action>, |
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boost::tuple<lambda_functor, |
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typename const_copy_argument <const A>::type> > > |
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operator[](const A& a) const { |
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return lambda_functor_base< |
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other_action<subscript_action>, |
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boost::tuple<lambda_functor, |
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typename const_copy_argument <const A>::type> > |
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( boost::tuple<lambda_functor, |
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typename const_copy_argument <const A>::type>(*this, a ) ); |
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} |
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}; |
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} // namespace lambda |
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} // namespace boost |
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#endif |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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e4d67989cc36
Revision: 201002
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff
changeset
|
212 |