allwpilib/upstream_utils/sleipnir_patches/0005-Replace-std-views-zip.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Tyler Veness <calcmogul@gmail.com>
Date: Sat, 8 Feb 2025 13:42:36 -0800
Subject: [PATCH 5/8] Replace std::views::zip()

---
 include/sleipnir/autodiff/adjoint_expression_graph.hpp | 5 ++++-
 include/sleipnir/optimization/problem.hpp              | 8 +++++---
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/include/sleipnir/autodiff/adjoint_expression_graph.hpp b/include/sleipnir/autodiff/adjoint_expression_graph.hpp
index 16bea7efeeca78d25b34b0b1242ca19cbd05a482..a77323eee9277fc3c77a11ab57ab5003d9ed4543 100644
--- a/include/sleipnir/autodiff/adjoint_expression_graph.hpp
+++ b/include/sleipnir/autodiff/adjoint_expression_graph.hpp
@@ -171,7 +171,10 @@ class AdjointExpressionGraph {
         }
       }
     } else {
-      for (const auto& [col, node] : std::views::zip(m_col_list, m_top_list)) {
+      for (size_t i = 0; i < m_top_list.size(); ++i) {
+        const auto& col = m_col_list[i];
+        const auto& node = m_top_list[i];
+
         // Append adjoints of wrt to sparse matrix triplets
         if (col != -1 && node->adjoint != Scalar(0)) {
           triplets.emplace_back(row, col, node->adjoint);
diff --git a/include/sleipnir/optimization/problem.hpp b/include/sleipnir/optimization/problem.hpp
index d20777a5b1912754dda5504313549197e867d34b..5256d08e5f9d8642049d8bb8323d76c7b3bbbef7 100644
--- a/include/sleipnir/optimization/problem.hpp
+++ b/include/sleipnir/optimization/problem.hpp
@@ -726,9 +726,11 @@ class Problem {
           for (const auto& constraint : constraints) {
             ++counts[static_cast<uint8_t>(constraint.type())];
           }
-          for (const auto& [count, name] :
-               std::views::zip(counts, std::array{"empty", "constant", "linear",
-                                                  "quadratic", "nonlinear"})) {
+          for (size_t i = 0; i < counts.size(); ++i) {
+            constexpr std::array names{"empty", "constant", "linear",
+                                       "quadratic", "nonlinear"};
+            const auto& count = counts[i];
+            const auto& name = names[i];
             if (count > 0) {
               slp::println("  ↳ {} {}", count, name);
             }