/* Copyright 2006-2009 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/flyweight for library home page. | |
*/ | |
#ifndef BOOST_FLYWEIGHT_ASSOC_CONTAINER_FACTORY_HPP | |
#define BOOST_FLYWEIGHT_ASSOC_CONTAINER_FACTORY_HPP | |
#if defined(_MSC_VER)&&(_MSC_VER>=1200) | |
#pragma once | |
#endif | |
#include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ | |
#include <boost/flyweight/assoc_container_factory_fwd.hpp> | |
#include <boost/flyweight/detail/is_placeholder_expr.hpp> | |
#include <boost/flyweight/detail/nested_xxx_if_not_ph.hpp> | |
#include <boost/flyweight/factory_tag.hpp> | |
#include <boost/mpl/apply.hpp> | |
#include <boost/mpl/aux_/lambda_support.hpp> | |
#include <boost/mpl/if.hpp> | |
namespace boost{namespace flyweights{namespace detail{ | |
BOOST_FLYWEIGHT_NESTED_XXX_IF_NOT_PLACEHOLDER_EXPRESSION_DEF(iterator); | |
BOOST_FLYWEIGHT_NESTED_XXX_IF_NOT_PLACEHOLDER_EXPRESSION_DEF(value_type); | |
}}} /* namespace boost::flyweights::detail */ | |
/* Factory class using a given associative container. | |
*/ | |
namespace boost{ | |
namespace flyweights{ | |
template<typename Container> | |
class assoc_container_factory_class:public factory_marker | |
{ | |
public: | |
/* When assoc_container_factory_class<Container> is an MPL placeholder | |
* expression, referring to Container::iterator and Container::value_type | |
* force the MPL placeholder expression Container to be instantiated, which | |
* is wasteful and can fail in concept-checked STL implementations. | |
* We protect ourselves against this circumstance. | |
*/ | |
typedef typename detail::nested_iterator_if_not_placeholder_expression< | |
Container | |
>::type handle_type; | |
typedef typename detail::nested_value_type_if_not_placeholder_expression< | |
Container | |
>::type entry_type; | |
handle_type insert(const entry_type& x) | |
{ | |
return cont.insert(x).first; | |
} | |
void erase(handle_type h) | |
{ | |
cont.erase(h); | |
} | |
static const entry_type& entry(handle_type h){return *h;} | |
private: | |
/* As above, avoid instantiating Container if it is an | |
* MPL placeholder expression. | |
*/ | |
typedef typename mpl::if_< | |
detail::is_placeholder_expression<Container>, | |
int, | |
Container | |
>::type container_type; | |
container_type cont; | |
public: | |
typedef assoc_container_factory_class type; | |
BOOST_MPL_AUX_LAMBDA_SUPPORT(1,assoc_container_factory_class,(Container)) | |
}; | |
/* assoc_container_factory_class specifier */ | |
template< | |
typename ContainerSpecifier | |
BOOST_FLYWEIGHT_NOT_A_PLACEHOLDER_EXPRESSION_DEF | |
> | |
struct assoc_container_factory:factory_marker | |
{ | |
template<typename Entry,typename Key> | |
struct apply | |
{ | |
typedef assoc_container_factory_class< | |
typename mpl::apply2<ContainerSpecifier,Entry,Key>::type | |
> type; | |
}; | |
}; | |
} /* namespace flyweights */ | |
} /* namespace boost */ | |
#endif |