From c468426dea155e33041272267f500bb5449d6277 Mon Sep 17 00:00:00 2001
From: Marcel <marehr@users.noreply.github.com>
Date: Tue, 20 Apr 2021 13:16:48 +0200
Subject: [PATCH] [FIX] gcc-11: std::views::drop expects
 std::ranges::range_difference_t<urng_t> (#2528)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* [FIX] gcc-11: std::views::drop expects std::ranges::range_difference_t<urng_t>

```
seqan3/include/seqan3/range/views/drop.hpp:95:49: error: no match for ‘operator|’ (operand types are ‘std::ranges::ref_view<std::__cxx11::list<seqan3::dna4> >’ and ‘std::ranges::views::__adaptor::_Partial<std::ranges::views::_Drop, long unsigned int>’)
   95 |             return std::forward<urng_t>(urange) | std::views::drop(drop_size);
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

* Apply suggestions from code review
---
 include/seqan3/range/views/drop.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/seqan3/range/views/drop.hpp b/include/seqan3/range/views/drop.hpp
index 87b5fb891c..d1680ca948 100644
--- a/include/seqan3/range/views/drop.hpp
+++ b/include/seqan3/range/views/drop.hpp
@@ -92,7 +92,9 @@ struct drop_fn
         // std::views::drop
         else
         {
-            return std::forward<urng_t>(urange) | std::views::drop(drop_size);
+            using drop_size_t = std::ranges::range_difference_t<urng_t>;
+            // urange | std::views::drop(drop_size);
+            return std::views::drop(std::forward<urng_t>(urange), static_cast<drop_size_t>(drop_size));
         }
     }
 };