From 1fb725a48863f40d9f4a6b4dde2fcb351d6013ed Mon Sep 17 00:00:00 2001
From: Niels Lohmann <mail@nlohmann.me>
Date: Fri, 16 Oct 2026 17:19:33 +0200
Subject: [PATCH] Use std::array for the index buffer in append_index()

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
---
 include/nlohmann/detail/json_pointer.hpp | 7 ++++---
 single_include/nlohmann/json.hpp         | 7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/include/nlohmann/detail/json_pointer.hpp b/include/nlohmann/detail/json_pointer.hpp
index 3b2180574..50036d000 100644
--- a/include/nlohmann/detail/json_pointer.hpp
+++ b/include/nlohmann/detail/json_pointer.hpp
@@ -9,6 +9,7 @@
 #pragma once
 
 #include <algorithm> // all_of
+#include <array> // array
 #include <cctype> // isdigit
 #include <cerrno> // errno, ERANGE
 #include <cstddef> // size_t
@@ -1270,15 +1271,15 @@ class json_pointer
     /// append the decimal representation of @a i to @a out
     static void append_index(string_t& out, std::size_t i)
     {
-        char buf[24]; // NOLINT(cppcoreguidelines-avoid-c-arrays,hicpp-avoid-c-arrays,modernize-avoid-c-arrays)
-        std::size_t pos = sizeof(buf);
+        std::array<char, 24> buf{};
+        std::size_t pos = buf.size();
         do
         {
             buf[--pos] = static_cast<char>('0' + i % 10);
             i /= 10;
         }
         while (i != 0);
-        out.append(buf + pos, sizeof(buf) - pos);
+        out.append(buf.data() + pos, buf.size() - pos);
     }
 
     /*!
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 93be3e8ff..89b0a77a1 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -21427,6 +21427,7 @@ NLOHMANN_JSON_NAMESPACE_END
 
 
 #include <algorithm> // all_of
+#include <array> // array
 #include <cctype> // isdigit
 #include <cerrno> // errno, ERANGE
 #include <cstddef> // size_t
@@ -22695,15 +22696,15 @@ class json_pointer
     /// append the decimal representation of @a i to @a out
     static void append_index(string_t& out, std::size_t i)
     {
-        char buf[24]; // NOLINT(cppcoreguidelines-avoid-c-arrays,hicpp-avoid-c-arrays,modernize-avoid-c-arrays)
-        std::size_t pos = sizeof(buf);
+        std::array<char, 24> buf{};
+        std::size_t pos = buf.size();
         do
         {
             buf[--pos] = static_cast<char>('0' + i % 10);
             i /= 10;
         }
         while (i != 0);
-        out.append(buf + pos, sizeof(buf) - pos);
+        out.append(buf.data() + pos, buf.size() - pos);
     }
 
     /*!