From 50d538760838094218642c30b72d402dff1d2ae5 Mon Sep 17 00:00:00 2001
From: Orfeas <38209077+0xfea5@users.noreply.github.com>
Date: Tue, 2 Sep 2025 13:23:08 +0300
Subject: day02: move lambdas out of loop

---
 day04/solution.cpp | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

(limited to 'day04/solution.cpp')

diff --git a/day04/solution.cpp b/day04/solution.cpp
index 6fa5ccd..fe33120 100644
--- a/day04/solution.cpp
+++ b/day04/solution.cpp
@@ -51,27 +51,27 @@ void part1(auto input) {
     views::zip(decr, decr),     // top-left
   };
 
-  for (const auto [i, j] :
+  auto in_bounds = [width, height](IndexPair e) -> bool {
+    auto &&[i, j] = e;
+    return 0 <= i and i < height and 0 <= j and j < width;
+  };
+
+  auto get_input_element = [input](IndexPair e) -> char {
+    auto &&[i, j] = e;
+    return input[i][j];
+  };
+
+  for (auto &&[i, j] :
          views::cartesian_product(views::iota(0, width),
                                   views::iota(0, height))) {
 
+    auto add_offset = [i, j](IndexPair e) {
+      const auto [di, dj] = e;
+      return IndexPair{i + di, j + dj};
+    };
+
     // std::apply is needed to unfold the ‘directions’ tuple.
     std::apply([=, &answer](auto &&... dirs) {
-      auto add_offset = [i, j](IndexPair e) {
-        const auto [di, dj] = e;
-        return std::tuple{i + di, j + dj};
-      };
-
-      auto in_bounds = [width, height](IndexPair e) -> bool {
-        const auto [i, j] = e;
-        return 0 <= i and i < height and 0 <= j and j < width;
-      };
-
-      auto get_input_element = [input](IndexPair e) -> char {
-        const auto [i, j] = e;
-        return input[i][j];
-      };
-
       (((answer += ranges::equal(dirs
                                  | views::transform(add_offset)
                                  | views::filter(in_bounds)
-- 
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