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utility : add printing of a tuple

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- << tuple now works, with a default version.
Useful for debugging
This commit is contained in:
Olivier Parcollet 2013-07-25 15:15:12 +02:00
parent bc64776de1
commit 7367e4d50a
1 changed files with 20 additions and 0 deletions
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20
triqs/utility/tuple_tools.hpp
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@ -183,6 +183,26 @@ namespace triqs { namespace tuple {
template<typename F, typename T1, typename T2, typename R>
auto fold_on_zip (F && f,T1 const & t1, T2 const & t2, R && r) DECL_AND_RETURN( fold_on_zip_impl<std::tuple_size<T1>::value-1,T1,T2>()(std::forward<F>(f),t1,t2,std::forward<R>(r)));
/*
* print a tuple
*/
template<int a, int b> struct __s {};
template<int L, typename T> void print_tuple_impl (std::ostream& os, T const& t, std::integral_constant<int,-1> ) {}
template<int L, int rpos, typename T> void print_tuple_impl (std::ostream& os, T const& t, std::integral_constant<int,rpos> ) {
os << std::get<L-rpos-1>(t);
if (rpos>0) os << ',';
print_tuple_impl<L>(os, t, std::integral_constant<int,rpos-1>());
}
}}
namespace std {
template<typename ... T> std::ostream & operator << (std::ostream & os, std::tuple<T...> const & t) {
os << "(";
constexpr int L = sizeof...(T);
triqs::tuple::print_tuple_impl<L>(os,t,std::integral_constant<int,L-1>());
return os << ")";
}
}
#endif