/usr/include/boost/poly_collection/detail
Edit: /usr/include/boost/poly_collection/detail/any_model.hpp (6018B)
/* Copyright 2016-2020 Joaquin M Lopez Munoz.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*
* See http://www.boost.org/libs/poly_collection for library home page.
*/
#ifndef BOOST_POLY_COLLECTION_DETAIL_ANY_MODEL_HPP
#define BOOST_POLY_COLLECTION_DETAIL_ANY_MODEL_HPP
#if defined(_MSC_VER)
#pragma once
#endif
#include
#include
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namespace boost{
namespace poly_collection{
namespace detail{
/* model for any_collection */
template
struct any_model;
/* Refine is_acceptable to cover type_erasure::any classes whose assignment
* operator won't compile.
*/
template
struct is_acceptable<
type_erasure::any,any_model,
typename std::enable_if<
!type_erasure::is_relaxed::value&&
!type_erasure::is_subconcept,Concept2>::value&&
!type_erasure::is_subconcept<
type_erasure::assignable,
Concept2>::value
>::type
>:std::false_type{};
/* is_terminal defined out-class to allow for partial specialization */
template
using any_model_enable_if_has_typeid_=typename std::enable_if<
type_erasure::is_subconcept<
type_erasure::typeid_::type>,
Concept
>::value
>::type*;
template
struct any_model_is_terminal:std::true_type{};
template
struct any_model_is_terminal<
type_erasure::any,any_model_enable_if_has_typeid_
>:std::false_type{};
/* used for make_value_type */
template
struct any_model_make_reference
{
static T& apply(Q& x){return x;}
};
template
struct any_model
{
using value_type=type_erasure::any<
typename std::conditional<
type_erasure::is_subconcept,Concept>::value,
Concept,
mpl::vector2>
>::type,
type_erasure::_self&
>;
template
using is_implementation=std::true_type; /* can't compile-time check concept
* compliance */
template
using is_terminal=any_model_is_terminal;
template
static const std::type_info& subtypeid(const T&){return typeid(T);}
template<
typename Concept2,typename T,
any_model_enable_if_has_typeid_ =nullptr
>
static const std::type_info& subtypeid(
const type_erasure::any& a)
{
return type_erasure::typeid_of(a);
}
template
static void* subaddress(T& x){return boost::addressof(x);}
template
static const void* subaddress(const T& x){return boost::addressof(x);}
template<
typename Concept2,typename T,
any_model_enable_if_has_typeid_ =nullptr
>
static void* subaddress(type_erasure::any& a)
{
return type_erasure::any_cast(&a);
}
template<
typename Concept2,typename T,
any_model_enable_if_has_typeid_ =nullptr
>
static const void* subaddress(const type_erasure::any& a)
{
return type_erasure::any_cast(&a);
}
using base_iterator=any_iterator;
using const_base_iterator=any_iterator;
using base_sentinel=value_type*;
using const_base_sentinel=const value_type*;
template
using iterator=Concrete*;
template
using const_iterator=const Concrete*;
template
using segment_backend=detail::segment_backend;
template
using segment_backend_implementation=
split_segment;
static base_iterator nonconst_iterator(const_base_iterator it)
{
return base_iterator{
const_cast(static_cast(it))};
}
template
static iterator nonconst_iterator(const_iterator it)
{
return const_cast>(it);
}
private:
template
friend class split_segment;
template
static value_type make_value_type(Concrete& x){return value_type{x};}
template
static value_type make_value_type(type_erasure::any& x)
{
/* I don't pretend to understand what's going on here, see
* https://lists.boost.org/boost-users/2017/05/87556.php
*/
using ref_type=type_erasure::any;
using make_ref=any_model_make_reference;
using concept_=typename type_erasure::concept_of::type;
auto b=type_erasure::make_binding<
mpl::map1>>();
return {
type_erasure::call(type_erasure::binding{b},make_ref{},x),
type_erasure::binding{b}
};
}
};
} /* namespace poly_collection::detail */
} /* namespace poly_collection */
} /* namespace boost */
#endif