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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// - casts.hpp -- BLambda Library ------------- |
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// |
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// Copyright (C) 2000 Gary Powell (powellg@amazon.com) |
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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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#if !defined(BOOST_LAMBDA_CASTS_HPP) |
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#define BOOST_LAMBDA_CASTS_HPP |
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#include <typeinfo> |
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namespace boost { |
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namespace lambda { |
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template<class T> class cast_action; |
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template<class T> class static_cast_action; |
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template<class T> class dynamic_cast_action; |
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template<class T> class const_cast_action; |
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template<class T> class reinterpret_cast_action; |
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class typeid_action; |
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class sizeof_action; |
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// Cast actions |
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template<class T> class cast_action<static_cast_action<T> > |
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{ |
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public: |
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template<class RET, class Arg1> |
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static RET apply(Arg1 &a1) { |
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return static_cast<RET>(a1); |
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} |
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}; |
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template<class T> class cast_action<dynamic_cast_action<T> > { |
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public: |
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template<class RET, class Arg1> |
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static RET apply(Arg1 &a1) { |
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return dynamic_cast<RET>(a1); |
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} |
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}; |
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template<class T> class cast_action<const_cast_action<T> > { |
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public: |
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template<class RET, class Arg1> |
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static RET apply(Arg1 &a1) { |
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return const_cast<RET>(a1); |
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} |
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}; |
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template<class T> class cast_action<reinterpret_cast_action<T> > { |
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public: |
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template<class RET, class Arg1> |
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static RET apply(Arg1 &a1) { |
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return reinterpret_cast<RET>(a1); |
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} |
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}; |
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// typedid action |
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class typeid_action { |
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public: |
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template<class RET, class Arg1> |
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static RET apply(Arg1 &a1) { |
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return typeid(a1); |
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} |
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}; |
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// sizeof action |
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class sizeof_action |
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{ |
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public: |
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template<class RET, class Arg1> |
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static RET apply(Arg1 &a1) { |
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return sizeof(a1); |
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} |
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}; |
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// return types of casting lambda_functors (all "T" type.) |
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template<template <class> class cast_type, class T, class A> |
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struct return_type_N<cast_action< cast_type<T> >, A> { |
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typedef T type; |
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}; |
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// return type of typeid_action |
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template<class A> |
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struct return_type_N<typeid_action, A> { |
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typedef std::type_info const & type; |
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}; |
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// return type of sizeof_action |
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template<class A> |
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struct return_type_N<sizeof_action, A> { |
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typedef std::size_t type; |
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}; |
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107 |
|
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// the four cast & typeid overloads. |
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// casts can take ordinary variables (not just lambda functors) |
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// static_cast |
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template <class T, class Arg1> |
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inline const lambda_functor< |
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lambda_functor_base< |
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action<1, cast_action<static_cast_action<T> > >, |
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tuple<typename const_copy_argument <const Arg1>::type> |
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> |
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118 |
> |
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ll_static_cast(const Arg1& a1) { |
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return |
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lambda_functor_base< |
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action<1, cast_action<static_cast_action<T> > >, |
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tuple<typename const_copy_argument <const Arg1>::type> |
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124 |
> |
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( tuple<typename const_copy_argument <const Arg1>::type>(a1)); |
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} |
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// dynamic_cast |
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template <class T, class Arg1> |
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inline const lambda_functor< |
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lambda_functor_base< |
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action<1, cast_action<dynamic_cast_action<T> > >, |
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tuple<typename const_copy_argument <const Arg1>::type> |
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> |
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> |
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ll_dynamic_cast(const Arg1& a1) { |
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return |
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lambda_functor_base< |
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action<1, cast_action<dynamic_cast_action<T> > >, |
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tuple<typename const_copy_argument <const Arg1>::type> |
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> |
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( tuple<typename const_copy_argument <const Arg1>::type>(a1)); |
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} |
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|
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// const_cast |
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template <class T, class Arg1> |
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inline const lambda_functor< |
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lambda_functor_base< |
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action<1, cast_action<const_cast_action<T> > >, |
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tuple<typename const_copy_argument <const Arg1>::type> |
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> |
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> |
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ll_const_cast(const Arg1& a1) { |
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return |
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lambda_functor_base< |
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action<1, cast_action<const_cast_action<T> > >, |
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tuple<typename const_copy_argument <const Arg1>::type> |
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> |
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( tuple<typename const_copy_argument <const Arg1>::type>(a1)); |
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} |
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|
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// reinterpret_cast |
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template <class T, class Arg1> |
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inline const lambda_functor< |
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lambda_functor_base< |
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action<1, cast_action<reinterpret_cast_action<T> > >, |
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tuple<typename const_copy_argument <const Arg1>::type> |
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> |
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> |
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ll_reinterpret_cast(const Arg1& a1) { |
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return |
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lambda_functor_base< |
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action<1, cast_action<reinterpret_cast_action<T> > >, |
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tuple<typename const_copy_argument <const Arg1>::type> |
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> |
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( tuple<typename const_copy_argument <const Arg1>::type>(a1)); |
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} |
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|
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// typeid |
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// can be applied to a normal variable as well (can refer to a polymorphic |
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// class object) |
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template <class Arg1> |
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inline const lambda_functor< |
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lambda_functor_base< |
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action<1, typeid_action>, |
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tuple<typename const_copy_argument <const Arg1>::type> |
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> |
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> |
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ll_typeid(const Arg1& a1) { |
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return |
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lambda_functor_base< |
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action<1, typeid_action>, |
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tuple<typename const_copy_argument <const Arg1>::type> |
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> |
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( tuple<typename const_copy_argument <const Arg1>::type>(a1)); |
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} |
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// sizeof(expression) |
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// Always takes a lambda expression (if not, built in sizeof will do) |
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template <class Arg1> |
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inline const lambda_functor< |
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lambda_functor_base< |
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action<1, sizeof_action>, |
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tuple<lambda_functor<Arg1> > |
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> |
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> |
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ll_sizeof(const lambda_functor<Arg1>& a1) { |
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return |
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lambda_functor_base< |
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action<1, sizeof_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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} // namespace lambda |
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} // namespace boost |
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#endif |