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PO
primarykey
Id
6401663
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2011-06-19T09:39:11.100
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0
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2011-06-19T12:35:58.313
LastEditDate
2011-06-19T12:35:58.313
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801620
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801620
ParentId
1198260
PostTypeId
2
Score
5
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0
LastEditorDisplayName
text
Body
If you want to use std::tuple and you have C++ compiler which supports variadic templates, try code bellow (tested with g++4.5). This should be the answer to your question. <pre><code>#include <tuple> // ------------- UTILITY--------------- template<int...> struct index_tuple{}; template<int I, typename IndexTuple, typename... Types> struct make_indexes_impl; template<int I, int... Indexes, typename T, typename ... Types> struct make_indexes_impl<I, index_tuple<Indexes...>, T, Types...> { typedef typename make_indexes_impl, Types...>::type type; }; template<int I, int... Indexes> struct make_indexes_impl<I, index_tuple<Indexes...> > { typedef index_tuple<Indexes...> type; }; template<typename ... Types> struct make_indexes : make_indexes_impl<0, index_tuple<>, Types...> {}; // ----------- FOR EACH ----------------- template<typename Func, typename Last> void for_each_impl(Func&& f, Last&& last) { f(last); } template<typename Func, typename First, typename ... Rest> void for_each_impl(Func&& f, First&& first, Rest&&...rest) { f(first); for_each_impl( std::forward<Func>(f), rest...); } template<typename Func, int ... Indexes, typename ... Args> void for_each_helper( Func&& f, index_tuple<Indexes...>, std::tuple<Args...>&& tup) { for_each_impl( std::forward<Func>(f), std::forward<Args>(std::get<Indexes>(tup))...); } template<typename Func, typename ... Args> void for_each( std::tuple<Args...>& tup, Func&& f) { for_each_helper(std::forward<Func>(f), typename make_indexes<Args...>::type(), std::forward<std::tuple<Args...>>(tup) ); } template<typename Func, typename ... Args> void for_each( std::tuple<Args...>&& tup, Func&& f) { for_each_helper(std::forward<Func>(f), typename make_indexes<Args...>::type(), std::forward<std::tuple<Args...>>(tup) ); } </code></pre> boost::fusion is another option, but it requires its own tuple type: boost::fusion::tuple. Lets better stick to the standard! Here is a test: <pre><code>#include <iostream> // ---------- FUNCTOR ---------- struct Functor { template<typename T> void operator()(T& t) const { std::cout << t << std::endl; } }; int main() { for_each( std::make_tuple(2, 0.6, 'c'), Functor() ); return 0; } </code></pre> the power of variadic templates!
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1. POiterate over tuple
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1. USsigidagi
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1. USsigidagi
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1. COI tried your first solution, but it fails with this function on pairs. Any idea why?template <typename T, typename U> void addt(pair<T,U> p) { cout << p.first + p.second << endl; } int main(int argc, char *argv[]) { cout << "Hello." << endl; for_each(make_tuple(2,3,4), [](int i) { cout << i << endl; }); for_each(make_tuple(make_pair(1,2),make_pair(3,4)), addt); return 0; }
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 USuser2023370

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