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uility : add foreach_enumerate

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- to be tested
This commit is contained in:
Olivier Parcollet 2013-07-25 13:24:50 +02:00
parent 157b014ad8
commit 2c77efe619
1 changed files with 24 additions and 0 deletions
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24
triqs/utility/tuple_tools.hpp
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@ -79,6 +79,30 @@ namespace triqs { namespace tuple {
for_each_impl<std::tuple_size<T>::value-1>()(t, f); for_each_impl<std::tuple_size<T>::value-1>()(t, f);
} }
/* for_each_enumerate(f, t)
* f: a callable object
* t: a tuple
* calls f on all tuple elements: f(x,n) for all x in t
*/
template<int pos> struct for_each_enumerate_impl {
template<typename T, typename F>
void operator()(T const & t, F && f) {
f(std::get<std::tuple_size<T>::value-1-pos>(t),std::tuple_size<T>::value-1-pos);
for_each_impl<pos-1>()(t, f);
}
};
template<>
struct for_each_enumerate_impl<0> {
template<typename T, typename F>
void operator() (T const & t, F && f) { f(std::get<std::tuple_size<T>::value-1>(t), std::tuple_size<T>::value-1); }
};
template<typename T, typename F>
void for_each_enumerate(T const & t, F && f) {
for_each_enumerate_impl<std::tuple_size<T>::value-1>()(t, f);
}
/** /**
* apply_on_zip(f, t1,t2) * apply_on_zip(f, t1,t2)
* f : a callable object * f : a callable object