mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-23 21:35:04 +03:00
186 lines
4.4 KiB
C++
186 lines
4.4 KiB
C++
/* Copyright 2003-2015 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/multi_index for library home page.
|
|
*/
|
|
|
|
#ifndef BOOST_MULTI_INDEX_GLOBAL_FUN_HPP
|
|
#define BOOST_MULTI_INDEX_GLOBAL_FUN_HPP
|
|
|
|
#if defined(_MSC_VER)
|
|
#pragma once
|
|
#endif
|
|
|
|
#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */
|
|
#include <boost/detail/workaround.hpp>
|
|
#include <boost/mpl/if.hpp>
|
|
#include <boost/type_traits/is_const.hpp>
|
|
#include <boost/type_traits/is_reference.hpp>
|
|
#include <boost/type_traits/remove_const.hpp>
|
|
#include <boost/type_traits/remove_reference.hpp>
|
|
#include <boost/utility/enable_if.hpp>
|
|
|
|
#if !defined(BOOST_NO_SFINAE)
|
|
#include <boost/type_traits/is_convertible.hpp>
|
|
#endif
|
|
|
|
namespace boost{
|
|
|
|
template<class T> class reference_wrapper; /* fwd decl. */
|
|
|
|
namespace multi_index{
|
|
|
|
namespace detail{
|
|
|
|
/* global_fun is a read-only key extractor from Value based on a given global
|
|
* (or static member) function with signature:
|
|
*
|
|
* Type f([const] Value [&]);
|
|
*
|
|
* Additionally, global_fun and const_global_fun are overloaded to support
|
|
* referece_wrappers of Value and "chained pointers" to Value's. By chained
|
|
* pointer to T we mean a type P such that, given a p of Type P
|
|
* *...n...*x is convertible to T&, for some n>=1.
|
|
* Examples of chained pointers are raw and smart pointers, iterators and
|
|
* arbitrary combinations of these (vg. T** or unique_ptr<T*>.)
|
|
*/
|
|
|
|
template<class Value,typename Type,Type (*PtrToFunction)(Value)>
|
|
struct const_ref_global_fun_base
|
|
{
|
|
typedef typename remove_reference<Type>::type result_type;
|
|
|
|
template<typename ChainedPtr>
|
|
|
|
#if !defined(BOOST_NO_SFINAE)
|
|
typename disable_if<
|
|
is_convertible<const ChainedPtr&,Value>,Type>::type
|
|
#else
|
|
Type
|
|
#endif
|
|
|
|
operator()(const ChainedPtr& x)const
|
|
{
|
|
return operator()(*x);
|
|
}
|
|
|
|
Type operator()(Value x)const
|
|
{
|
|
return PtrToFunction(x);
|
|
}
|
|
|
|
Type operator()(
|
|
const reference_wrapper<
|
|
typename remove_reference<Value>::type>& x)const
|
|
{
|
|
return operator()(x.get());
|
|
}
|
|
|
|
Type operator()(
|
|
const reference_wrapper<
|
|
typename remove_const<
|
|
typename remove_reference<Value>::type>::type>& x
|
|
|
|
#if BOOST_WORKAROUND(BOOST_MSVC,==1310)
|
|
/* http://lists.boost.org/Archives/boost/2015/10/226135.php */
|
|
,int=0
|
|
#endif
|
|
|
|
)const
|
|
{
|
|
return operator()(x.get());
|
|
}
|
|
};
|
|
|
|
template<class Value,typename Type,Type (*PtrToFunction)(Value)>
|
|
struct non_const_ref_global_fun_base
|
|
{
|
|
typedef typename remove_reference<Type>::type result_type;
|
|
|
|
template<typename ChainedPtr>
|
|
|
|
#if !defined(BOOST_NO_SFINAE)
|
|
typename disable_if<
|
|
is_convertible<ChainedPtr&,Value>,Type>::type
|
|
#else
|
|
Type
|
|
#endif
|
|
|
|
operator()(const ChainedPtr& x)const
|
|
{
|
|
return operator()(*x);
|
|
}
|
|
|
|
Type operator()(Value x)const
|
|
{
|
|
return PtrToFunction(x);
|
|
}
|
|
|
|
Type operator()(
|
|
const reference_wrapper<
|
|
typename remove_reference<Value>::type>& x)const
|
|
{
|
|
return operator()(x.get());
|
|
}
|
|
};
|
|
|
|
template<class Value,typename Type,Type (*PtrToFunction)(Value)>
|
|
struct non_ref_global_fun_base
|
|
{
|
|
typedef typename remove_reference<Type>::type result_type;
|
|
|
|
template<typename ChainedPtr>
|
|
|
|
#if !defined(BOOST_NO_SFINAE)
|
|
typename disable_if<
|
|
is_convertible<const ChainedPtr&,const Value&>,Type>::type
|
|
#else
|
|
Type
|
|
#endif
|
|
|
|
operator()(const ChainedPtr& x)const
|
|
{
|
|
return operator()(*x);
|
|
}
|
|
|
|
Type operator()(const Value& x)const
|
|
{
|
|
return PtrToFunction(x);
|
|
}
|
|
|
|
Type operator()(const reference_wrapper<const Value>& x)const
|
|
{
|
|
return operator()(x.get());
|
|
}
|
|
|
|
Type operator()(
|
|
const reference_wrapper<typename remove_const<Value>::type>& x)const
|
|
{
|
|
return operator()(x.get());
|
|
}
|
|
};
|
|
|
|
} /* namespace multi_index::detail */
|
|
|
|
template<class Value,typename Type,Type (*PtrToFunction)(Value)>
|
|
struct global_fun:
|
|
mpl::if_c<
|
|
is_reference<Value>::value,
|
|
typename mpl::if_c<
|
|
is_const<typename remove_reference<Value>::type>::value,
|
|
detail::const_ref_global_fun_base<Value,Type,PtrToFunction>,
|
|
detail::non_const_ref_global_fun_base<Value,Type,PtrToFunction>
|
|
>::type,
|
|
detail::non_ref_global_fun_base<Value,Type,PtrToFunction>
|
|
>::type
|
|
{
|
|
};
|
|
|
|
} /* namespace multi_index */
|
|
|
|
} /* namespace boost */
|
|
|
|
#endif
|