author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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// - lambda_traits.hpp --- Boost Lambda Library ---------------------------- |
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// |
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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 www.boost.org |
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// ------------------------------------------------------------------------- |
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#ifndef BOOST_LAMBDA_LAMBDA_TRAITS_HPP |
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#define BOOST_LAMBDA_LAMBDA_TRAITS_HPP |
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#include "boost/type_traits/transform_traits.hpp" |
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#include "boost/type_traits/cv_traits.hpp" |
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#include "boost/type_traits/function_traits.hpp" |
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#include "boost/type_traits/object_traits.hpp" |
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namespace boost { |
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namespace lambda { |
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// -- if construct ------------------------------------------------ |
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// Proposed by Krzysztof Czarnecki and Ulrich Eisenecker |
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namespace detail { |
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template <bool If, class Then, class Else> struct IF { typedef Then RET; }; |
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template <class Then, class Else> struct IF<false, Then, Else> { |
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typedef Else RET; |
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}; |
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// An if construct that doesn't instantiate the non-matching template: |
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// Called as: |
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// IF_type<condition, A, B>::type |
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// The matching template must define the typeded 'type' |
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// I.e. A::type if condition is true, B::type if condition is false |
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// Idea from Vesa Karvonen (from C&E as well I guess) |
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template<class T> |
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struct IF_type_ |
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{ |
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typedef typename T::type type; |
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}; |
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template<bool C, class T, class E> |
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struct IF_type |
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{ |
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typedef typename |
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IF_type_<typename IF<C, T, E>::RET >::type type; |
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}; |
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// helper that can be used to give typedef T to some type |
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template <class T> struct identity_mapping { typedef T type; }; |
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// An if construct for finding an integral constant 'value' |
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// Does not instantiate the non-matching branch |
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// Called as IF_value<condition, A, B>::value |
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// If condition is true A::value must be defined, otherwise B::value |
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template<class T> |
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struct IF_value_ |
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{ |
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BOOST_STATIC_CONSTANT(int, value = T::value); |
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}; |
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template<bool C, class T, class E> |
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struct IF_value |
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{ |
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BOOST_STATIC_CONSTANT(int, value = (IF_value_<typename IF<C, T, E>::RET>::value)); |
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}; |
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// -------------------------------------------------------------- |
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// removes reference from other than function types: |
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template<class T> class remove_reference_if_valid |
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{ |
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typedef typename boost::remove_reference<T>::type plainT; |
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public: |
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typedef typename IF< |
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boost::is_function<plainT>::value, |
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T, |
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plainT |
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>::RET type; |
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}; |
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template<class T> struct remove_reference_and_cv { |
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typedef typename boost::remove_cv< |
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typename boost::remove_reference<T>::type |
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>::type type; |
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}; |
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// returns a reference to the element of tuple T |
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template<int N, class T> struct tuple_element_as_reference { |
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typedef typename |
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boost::tuples::access_traits< |
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typename boost::tuples::element<N, T>::type |
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>::non_const_type type; |
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}; |
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// returns the cv and reverence stripped type of a tuple element |
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template<int N, class T> struct tuple_element_stripped { |
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typedef typename |
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remove_reference_and_cv< |
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typename boost::tuples::element<N, T>::type |
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>::type type; |
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}; |
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// is_lambda_functor ------------------------------------------------- |
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template <class T> struct is_lambda_functor_ { |
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BOOST_STATIC_CONSTANT(bool, value = false); |
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}; |
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template <class Arg> struct is_lambda_functor_<lambda_functor<Arg> > { |
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BOOST_STATIC_CONSTANT(bool, value = true); |
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}; |
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} // end detail |
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template <class T> struct is_lambda_functor { |
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BOOST_STATIC_CONSTANT(bool, |
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value = |
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detail::is_lambda_functor_< |
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typename detail::remove_reference_and_cv<T>::type |
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>::value); |
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}; |
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namespace detail { |
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// -- parameter_traits_ --------------------------------------------- |
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// An internal parameter type traits class that respects |
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// the reference_wrapper class. |
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|
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// The conversions performed are: |
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// references -> compile_time_error |
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// T1 -> T2, |
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// reference_wrapper<T> -> T& |
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// const array -> ref to const array |
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// array -> ref to array |
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// function -> ref to function |
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// ------------------------------------------------------------------------ |
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template<class T1, class T2> |
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struct parameter_traits_ { |
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typedef T2 type; |
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}; |
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// Do not instantiate with reference types |
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template<class T, class Any> struct parameter_traits_<T&, Any> { |
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typedef typename |
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generate_error<T&>:: |
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parameter_traits_class_instantiated_with_reference_type type; |
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}; |
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// Arrays can't be stored as plain types; convert them to references |
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template<class T, int n, class Any> struct parameter_traits_<T[n], Any> { |
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typedef T (&type)[n]; |
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}; |
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template<class T, int n, class Any> |
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struct parameter_traits_<const T[n], Any> { |
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typedef const T (&type)[n]; |
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}; |
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template<class T, int n, class Any> |
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struct parameter_traits_<volatile T[n], Any> { |
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typedef volatile T (&type)[n]; |
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}; |
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template<class T, int n, class Any> |
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struct parameter_traits_<const volatile T[n], Any> { |
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typedef const volatile T (&type)[n]; |
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}; |
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template<class T, class Any> |
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struct parameter_traits_<boost::reference_wrapper<T>, Any >{ |
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typedef T& type; |
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}; |
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template<class T, class Any> |
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struct parameter_traits_<const boost::reference_wrapper<T>, Any >{ |
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typedef T& type; |
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}; |
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template<class T, class Any> |
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struct parameter_traits_<volatile boost::reference_wrapper<T>, Any >{ |
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typedef T& type; |
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}; |
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template<class T, class Any> |
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struct parameter_traits_<const volatile boost::reference_wrapper<T>, Any >{ |
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typedef T& type; |
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}; |
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template<class Any> |
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struct parameter_traits_<void, Any> { |
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typedef void type; |
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}; |
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template<class Arg, class Any> |
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struct parameter_traits_<lambda_functor<Arg>, Any > { |
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typedef lambda_functor<Arg> type; |
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}; |
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template<class Arg, class Any> |
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struct parameter_traits_<const lambda_functor<Arg>, Any > { |
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typedef lambda_functor<Arg> type; |
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}; |
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// Are the volatile versions needed? |
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template<class Arg, class Any> |
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struct parameter_traits_<volatile lambda_functor<Arg>, Any > { |
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typedef lambda_functor<Arg> type; |
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}; |
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template<class Arg, class Any> |
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struct parameter_traits_<const volatile lambda_functor<Arg>, Any > { |
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typedef lambda_functor<Arg> type; |
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}; |
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} // end namespace detail |
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// ------------------------------------------------------------------------ |
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// traits classes for lambda expressions (bind functions, operators ...) |
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// must be instantiated with non-reference types |
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// The default is const plain type ------------------------- |
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// const T -> const T, |
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// T -> const T, |
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// references -> compile_time_error |
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// reference_wrapper<T> -> T& |
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// array -> const ref array |
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template<class T> |
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struct const_copy_argument { |
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typedef typename |
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detail::parameter_traits_< |
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T, |
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typename detail::IF<boost::is_function<T>::value, T&, const T>::RET |
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>::type type; |
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}; |
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// T may be a function type. Without the IF test, const would be added |
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// to a function type, which is illegal. |
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// all arrays are converted to const. |
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// This traits template is used for 'const T&' parameter passing |
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// and thus the knowledge of the potential |
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// non-constness of an actual argument is lost. |
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template<class T, int n> struct const_copy_argument <T[n]> { |
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typedef const T (&type)[n]; |
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}; |
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template<class T, int n> struct const_copy_argument <volatile T[n]> { |
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typedef const volatile T (&type)[n]; |
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}; |
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template<class T> |
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struct const_copy_argument<T&> {}; |
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// do not instantiate with references |
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// typedef typename detail::generate_error<T&>::references_not_allowed type; |
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template<> |
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struct const_copy_argument<void> { |
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typedef void type; |
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}; |
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// Does the same as const_copy_argument, but passes references through as such |
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template<class T> |
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struct bound_argument_conversion { |
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typedef typename const_copy_argument<T>::type type; |
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}; |
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template<class T> |
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struct bound_argument_conversion<T&> { |
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typedef T& type; |
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}; |
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// The default is non-const reference ------------------------- |
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// const T -> const T&, |
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// T -> T&, |
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// references -> compile_time_error |
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// reference_wrapper<T> -> T& |
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template<class T> |
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struct reference_argument { |
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typedef typename detail::parameter_traits_<T, T&>::type type; |
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}; |
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template<class T> |
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struct reference_argument<T&> { |
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typedef typename detail::generate_error<T&>::references_not_allowed type; |
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}; |
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template<class Arg> |
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struct reference_argument<lambda_functor<Arg> > { |
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typedef lambda_functor<Arg> type; |
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}; |
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template<class Arg> |
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struct reference_argument<const lambda_functor<Arg> > { |
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typedef lambda_functor<Arg> type; |
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}; |
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320 |
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// Are the volatile versions needed? |
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template<class Arg> |
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struct reference_argument<volatile lambda_functor<Arg> > { |
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typedef lambda_functor<Arg> type; |
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325 |
}; |
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326 |
|
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327 |
template<class Arg> |
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struct reference_argument<const volatile lambda_functor<Arg> > { |
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typedef lambda_functor<Arg> type; |
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330 |
}; |
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331 |
|
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332 |
template<> |
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struct reference_argument<void> { |
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typedef void type; |
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335 |
}; |
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336 |
|
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namespace detail { |
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338 |
|
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// Array to pointer conversion |
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template <class T> |
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struct array_to_pointer { |
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typedef T type; |
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343 |
}; |
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|
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template <class T, int N> |
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struct array_to_pointer <const T[N]> { |
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typedef const T* type; |
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}; |
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template <class T, int N> |
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struct array_to_pointer <T[N]> { |
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typedef T* type; |
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352 |
}; |
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353 |
|
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354 |
template <class T, int N> |
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struct array_to_pointer <const T (&) [N]> { |
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typedef const T* type; |
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}; |
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358 |
template <class T, int N> |
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struct array_to_pointer <T (&) [N]> { |
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typedef T* type; |
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361 |
}; |
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362 |
|
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363 |
|
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// --------------------------------------------------------------------------- |
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// The call_traits for bind |
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// Respects the reference_wrapper class. |
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367 |
|
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// These templates are used outside of bind functions as well. |
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// the bind_tuple_mapper provides a shorter notation for default |
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// bound argument storing semantics, if all arguments are treated |
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// uniformly. |
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372 |
|
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// from template<class T> foo(const T& t) : bind_traits<const T>::type |
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// from template<class T> foo(T& t) : bind_traits<T>::type |
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375 |
|
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// Conversions: |
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// T -> const T, |
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// cv T -> cv T, |
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// T& -> T& |
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// reference_wrapper<T> -> T& |
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// const reference_wrapper<T> -> T& |
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// array -> const ref array |
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383 |
|
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// make bound arguments const, this is a deliberate design choice, the |
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// purpose is to prevent side effects to bound arguments that are stored |
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// as copies |
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387 |
template<class T> |
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388 |
struct bind_traits { |
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typedef const T type; |
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}; |
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391 |
|
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392 |
template<class T> |
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393 |
struct bind_traits<T&> { |
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typedef T& type; |
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395 |
}; |
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396 |
|
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// null_types are an exception, we always want to store them as non const |
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// so that other templates can assume that null_type is always without const |
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399 |
template<> |
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struct bind_traits<null_type> { |
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typedef null_type type; |
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402 |
}; |
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403 |
|
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// the bind_tuple_mapper, bind_type_generators may |
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// introduce const to null_type |
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template<> |
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struct bind_traits<const null_type> { |
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typedef null_type type; |
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409 |
}; |
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410 |
|
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// Arrays can't be stored as plain types; convert them to references. |
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// All arrays are converted to const. This is because bind takes its |
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// parameters as const T& and thus the knowledge of the potential |
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// non-constness of actual argument is lost. |
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template<class T, int n> struct bind_traits <T[n]> { |
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typedef const T (&type)[n]; |
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417 |
}; |
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418 |
|
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template<class T, int n> |
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struct bind_traits<const T[n]> { |
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typedef const T (&type)[n]; |
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}; |
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423 |
|
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template<class T, int n> struct bind_traits<volatile T[n]> { |
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typedef const volatile T (&type)[n]; |
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426 |
}; |
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template<class T, int n> |
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struct bind_traits<const volatile T[n]> { |
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typedef const volatile T (&type)[n]; |
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}; |
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template<class T> |
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struct bind_traits<reference_wrapper<T> >{ |
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typedef T& type; |
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}; |
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|
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template<class T> |
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struct bind_traits<const reference_wrapper<T> >{ |
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typedef T& type; |
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}; |
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|
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template<> |
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struct bind_traits<void> { |
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typedef void type; |
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}; |
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|
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|
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|
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template < |
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class T0 = null_type, class T1 = null_type, class T2 = null_type, |
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class T3 = null_type, class T4 = null_type, class T5 = null_type, |
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class T6 = null_type, class T7 = null_type, class T8 = null_type, |
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class T9 = null_type |
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> |
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struct bind_tuple_mapper { |
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typedef |
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tuple<typename bind_traits<T0>::type, |
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typename bind_traits<T1>::type, |
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typename bind_traits<T2>::type, |
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typename bind_traits<T3>::type, |
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typename bind_traits<T4>::type, |
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typename bind_traits<T5>::type, |
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typename bind_traits<T6>::type, |
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typename bind_traits<T7>::type, |
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typename bind_traits<T8>::type, |
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typename bind_traits<T9>::type> type; |
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}; |
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|
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// bind_traits, except map const T& -> const T |
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// this is needed e.g. in currying. Const reference arguments can |
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// refer to temporaries, so it is not safe to store them as references. |
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template <class T> struct remove_const_reference { |
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typedef typename bind_traits<T>::type type; |
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}; |
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template <class T> struct remove_const_reference<const T&> { |
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typedef const T type; |
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}; |
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// maps the bind argument types to the resulting lambda functor type |
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template < |
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class T0 = null_type, class T1 = null_type, class T2 = null_type, |
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class T3 = null_type, class T4 = null_type, class T5 = null_type, |
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class T6 = null_type, class T7 = null_type, class T8 = null_type, |
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class T9 = null_type |
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> |
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class bind_type_generator { |
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typedef typename |
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detail::bind_tuple_mapper< |
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T0, T1, T2, T3, T4, T5, T6, T7, T8, T9 |
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>::type args_t; |
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|
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BOOST_STATIC_CONSTANT(int, nof_elems = boost::tuples::length<args_t>::value); |
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|
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typedef |
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action< |
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nof_elems, |
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function_action<nof_elems> |
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> action_type; |
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public: |
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typedef |
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lambda_functor< |
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lambda_functor_base< |
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action_type, |
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args_t |
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> |
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> type; |
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|
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}; |
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} // detail |
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template <class T> inline const T& make_const(const T& t) { return t; } |
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} // end of namespace lambda |
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} // end of namespace boost |
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#endif // BOOST_LAMBDA_TRAITS_HPP |