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/* Boost.MultiIndex example of a bidirectional map.
*
* Copyright 2003-2009 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/multi_index for library home page.
*/
#if !defined(NDEBUG)
#define BOOST_MULTI_INDEX_ENABLE_INVARIANT_CHECKING
#define BOOST_MULTI_INDEX_ENABLE_SAFE_MODE
#endif
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/member.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <iostream>
#include <string>
using boost::multi_index_container;
using namespace boost::multi_index;
/* tags for accessing both sides of a bidirectional map */
struct from{};
struct to{};
/* The class template bidirectional_map wraps the specification
* of a bidirectional map based on multi_index_container.
*/
template<typename FromType,typename ToType>
struct bidirectional_map
{
struct value_type
{
value_type(const FromType& first_,const ToType& second_):
first(first_),second(second_)
{}
FromType first;
ToType second;
};
#if defined(BOOST_NO_POINTER_TO_MEMBER_TEMPLATE_PARAMETERS) ||\
defined(BOOST_MSVC)&&(BOOST_MSVC<1300) ||\
defined(BOOST_INTEL_CXX_VERSION)&&defined(_MSC_VER)&&\
(BOOST_INTEL_CXX_VERSION<=700)
/* see Compiler specifics: Use of member_offset for info on member<> and
* member_offset<>
*/
BOOST_STATIC_CONSTANT(unsigned,from_offset=offsetof(value_type,first));
BOOST_STATIC_CONSTANT(unsigned,to_offset =offsetof(value_type,second));
typedef multi_index_container<
value_type,
indexed_by<
ordered_unique<
tag<from>,member_offset<value_type,FromType,from_offset> >,
ordered_unique<
tag<to>, member_offset<value_type,ToType,to_offset> >
>
> type;
#else
/* A bidirectional map can be simulated as a multi_index_container
* of pairs of (FromType,ToType) with two unique indices, one
* for each member of the pair.
*/
typedef multi_index_container<
value_type,
indexed_by<
ordered_unique<
tag<from>,member<value_type,FromType,&value_type::first> >,
ordered_unique<
tag<to>, member<value_type,ToType,&value_type::second> >
>
> type;
#endif
};
/* a dictionary is a bidirectional map from strings to strings */
typedef bidirectional_map<std::string,std::string>::type dictionary;
int main()
{
dictionary d;
/* Fill up our microdictionary. first members Spanish, second members
* English.
*/
d.insert(dictionary::value_type("hola","hello"));
d.insert(dictionary::value_type("adios","goodbye"));
d.insert(dictionary::value_type("rosa","rose"));
d.insert(dictionary::value_type("mesa","table"));
std::cout<<"enter a word"<<std::endl;
std::string word;
std::getline(std::cin,word);
#if defined(BOOST_NO_MEMBER_TEMPLATES) /* use global get<> and family instead */
dictionary::iterator it=get<from>(d).find(word);
if(it!=d.end()){
std::cout<<word<<" is said "<<it->second<<" in English"<<std::endl;
}
else{
nth_index<dictionary,1>::type::iterator it2=get<1>(d).find(word);
if(it2!=get<1>(d).end()){
std::cout<<word<<" is said "<<it2->first<<" in Spanish"<<std::endl;
}
else std::cout<<"No such word in the dictionary"<<std::endl;
}
#else
/* search the queried word on the from index (Spanish) */
dictionary::iterator it=d.get<from>().find(word);
if(it!=d.end()){ /* found */
/* the second part of the element is the equivalent in English */
std::cout<<word<<" is said "<<it->second<<" in English"<<std::endl;
}
else{
/* word not found in Spanish, try our luck in English */
dictionary::index<to>::type::iterator it2=d.get<to>().find(word);
if(it2!=d.get<to>().end()){
std::cout<<word<<" is said "<<it2->first<<" in Spanish"<<std::endl;
}
else std::cout<<"No such word in the dictionary"<<std::endl;
}
#endif
return 0;
}
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