Merge pull request #1553 from ericniebler/missing-ranges-to-overload

add ranges::to overload for converting to container of containers
ericniebler · Aug 18, 2020 · 2d606af · 2d606af
2 parents b0e8cc4 + a8edfeb
commit 2d606af
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diff --git a/include/range/v3/range/conversion.hpp b/include/range/v3/range/conversion.hpp
@@ -443,6 +443,17 @@ namespace ranges
             return detail::to_container_fn<meta::id<Cont>>{}(static_cast<Rng &&>(rng));
         }
 
+        /// \overload
+        template(typename Cont, typename Rng)(
+            /// \pre
+            requires input_range<Rng> AND
+                (!detail::convertible_to_cont<Rng, Cont>) AND
+                detail::convertible_to_cont_cont<Rng, Cont>)
+        auto to(Rng && rng) -> Cont
+        {
+            return detail::to_container_fn<meta::id<Cont>>{}(static_cast<Rng &&>(rng));
+        }
+
         /// \cond
         // Slightly odd initializer_list overloads, undocumented for now.
         template(template<typename...> class ContT, typename T)(

diff --git a/test/range/conversion.cpp b/test/range/conversion.cpp
@@ -213,5 +213,13 @@ int main()
 
     test_zip_to_map(views::zip(views::ints, views::iota(0, 10)), 0);
 
+    // https://github.com/ericniebler/range-v3/issues/1544
+    {
+        std::vector<std::vector<int>> d;
+        auto m = views::transform(d, views::all);
+        auto v = ranges::to<std::vector<std::vector<int>>>(m);
+        check_equal(d, v);
+    }
+
     return ::test_result();
 }