tuple: remove `call' as it now duplicates std::apply

tuple.hpp

@@ -66,36 +66,6 @@ namespace util::tuple {
     { return for_type<decltype(t)> (f); }
 
 
-    ///////////////////////////////////////////////////////////////////////////
-    // unpack a tuple as function arguments
-    namespace detail {
-        template <
-            typename Func,
-            typename ...Args,
-            size_t ...I
-        >
-        auto
-        call (const Func &func, std::tuple<Args...> args, std::index_sequence<I...>)
-        {
-            // quiet unused variable warning with zero args
-            (void)args;
-
-            // XXX: Use `std::invoke' when gcc catches up with c++17
-            return func (std::get<I> (args)...);
-        }
-    }
-
-    template <
-        typename Func,
-        typename ...Args
-    >
-    auto
-    call (const Func &func, std::tuple<Args...> args)
-    {
-        return detail::call (func, args, std::make_index_sequence<sizeof...(Args)> {});
-    }
-
-
     ///////////////////////////////////////////////////////////////////////////
     /// call a provided object with each value in a tuple
     template <