どのように私は、ブースト融合マップにイテレータを得るのですか?
-
25-09-2019 - |
質問
私はboost::fusion::map
のためのイテレータを取得しようとしているが、私は何かが欠けています。
boost::fusion::vector
と、次の作品ます:
typedef vector<int,char,double> vector_t;
vector_t vec(20,'B',14.5);
typedef result_of::begin<vector_t>::type vb;
typedef result_of::end<vector_t>::type ve;
vb vb_(vec);
ve ve_(vec);
iterator_range<vb,ve> range(vb_,ve_);
std::cout << range << std::endl;
出力:
(20 B 14.5)
私はfusion::map
と同じようなことをやってみたいけど、それはコンパイルに失敗します:
typedef map< pair<int,char>, pair<double, std::string> > map_t;
typedef result_of::begin<map_t>::type b;
map_t m( pair<int,char>('C'), pair<double, std::string>("CEE") );
//b b_(m); // this fails to compile
私はこれらを含めています:
#include <iostream>
#include <string>
#include <boost/fusion/support/pair.hpp>
#include <boost/fusion/include/pair.hpp>
#include <boost/fusion/container/map.hpp>
#include <boost/fusion/include/map.hpp>
#include <boost/fusion/container/map/map_fwd.hpp>
#include <boost/fusion/include/map_fwd.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/include/begin.hpp>
#include <boost/fusion/sequence/intrinsic/end.hpp>
#include <boost/fusion/include/end.hpp>
#include <boost/fusion/view/iterator_range.hpp>
#include <boost/fusion/include/iterator_range.hpp>
#include <boost/fusion/sequence/io.hpp>
#include <boost/fusion/include/io.hpp>
using namespace boost::fusion;
エラー:
main.cpp: In function 'int main()':
main.cpp:83: error: no matching function for call to 'boost::fusion::basic_iterator<boost::fusion::map_iterator_tag,
boost::fusion::map<boost::fusion::pair<int, char>, boost::fusion::pair<double,
std::basic_string<char, std::char_traits<char>, std::allocator<char> > >,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_>::category, boost::fusion::map<boost::fusion::pair<int, char>,
boost::fusion::pair<double, std::basic_string<char, std::char_traits<char>,
std::allocator<char> > >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_>, 0>::basic_iterator(main()::map_t&)'
/home/bimbo/local/linux/include/boost-
1_43_0/boost/fusion/iterator/basic_iterator.hpp:125: note: candidates are:
boost::fusion::basic_iterator<Tag, Category, Seq, Index>::basic_iterator(Seq&, int) [with
Tag = boost::fusion::map_iterator_tag, Category =
boost::fusion::map<boost::fusion::pair<int, char>, boost::fusion::pair<double,
std::basic_string<char, std::char_traits<char>, std::allocator<char> > >,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_>::category, Seq = boost::fusion::map<boost::fusion::pair<int, char>,
boost::fusion::pair<double, std::basic_string<char, std::char_traits<char>,
std::allocator<char> > >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_>, int Index = 0]
/home/bimbo/local/linux/include/boost-
1_43_0/boost/fusion/iterator/basic_iterator.hpp:43: note:
boost::fusion::basic_iterator<boost::fusion::map_iterator_tag,
boost::fusion::map<boost::fusion::pair<int, char>, boost::fusion::pair<double,
std::basic_string<char, std::char_traits<char>, std::allocator<char> > >,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_>::category, boost::fusion::map<boost::fusion::pair<int, char>,
boost::fusion::pair<double, std::basic_string<char, std::char_traits<char>,
std::allocator<char> > >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_>, 0>::basic_iterator(const
boost::fusion::basic_iterator<boost::fusion::map_iterator_tag,
boost::fusion::map<boost::fusion::pair<int, char>, boost::fusion::pair<double,
std::basic_string<char, std::char_traits<char>, std::allocator<char> > >,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_>::category, boost::fusion::map<boost::fusion::pair<int, char>,
boost::fusion::pair<double, std::basic_string<char, std::char_traits<char>,
std::allocator<char> > >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_,
boost::fusion::void_>, 0>&)
scons: *** [main.o] Error 1
解決
fusion::for_each
を見ると、それはイテレータを取得するためにfusion::begin()
とfusion::end()
を使用しています。
私はそれをfusion::map
に適用されたときに動作します:
typedef map< pair<int,char>, pair<double, std::string> > map_t;
typedef result_of::begin<map_t>::type b;
typedef result_of::end<map_t>::type e;
map_t m( pair<int,char>('C'), pair<double, std::string>("CEE") );
b b_(begin(m));
e e_(end(m));
iterator_range<b,e> range(b_,e_);
std::cout << "map_t: \n" << range << std::endl;
またはインライン化:
iterator_range<b,e> range(begin(m),end(m));
出力:
map_t:
(C CEE)
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