From 47202c804ad9be5dbb97f9f0d24242ff570ba67d Mon Sep 17 00:00:00 2001
From: Niels Lohmann <mail@nlohmann.me>
Date: Mon, 18 May 2026 20:33:47 +0200
Subject: [PATCH] Add missing overload to ordered_map::find (#5171)

* :bug: add missing overload

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* :art: fix amalgamation

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* :bug: fix typo

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

* :rotating_light: fix warning

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

---------

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
---
 include/nlohmann/ordered_map.hpp | 14 ++++++++++++++
 single_include/nlohmann/json.hpp | 14 ++++++++++++++
 tests/src/unit-ordered_map.cpp   |  5 +++++
 3 files changed, 33 insertions(+)

diff --git a/include/nlohmann/ordered_map.hpp b/include/nlohmann/ordered_map.hpp
index 5ba0da18f..7b8cf70f4 100644
--- a/include/nlohmann/ordered_map.hpp
+++ b/include/nlohmann/ordered_map.hpp
@@ -340,6 +340,20 @@ template <class Key, class T, class IgnoredLess = std::less<Key>,
         return Container::end();
     }
 
+    template<class KeyType, detail::enable_if_t<
+                 detail::is_usable_as_key_type<key_compare, key_type, KeyType>::value, int> = 0>
+    const_iterator find(KeyType && key) const // NOLINT(cppcoreguidelines-missing-std-forward)
+    {
+        for (auto it = this->begin(); it != this->end(); ++it)
+        {
+            if (m_compare(it->first, key))
+            {
+                return it;
+            }
+        }
+        return Container::end();
+    }
+
     std::pair<iterator, bool> insert( value_type&& value )
     {
         return emplace(value.first, std::move(value.second));
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 7fb20c6c9..795d60cfe 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -20468,6 +20468,20 @@ template <class Key, class T, class IgnoredLess = std::less<Key>,
         return Container::end();
     }
 
+    template<class KeyType, detail::enable_if_t<
+                 detail::is_usable_as_key_type<key_compare, key_type, KeyType>::value, int> = 0>
+    const_iterator find(KeyType && key) const // NOLINT(cppcoreguidelines-missing-std-forward)
+    {
+        for (auto it = this->begin(); it != this->end(); ++it)
+        {
+            if (m_compare(it->first, key))
+            {
+                return it;
+            }
+        }
+        return Container::end();
+    }
+
     std::pair<iterator, bool> insert( value_type&& value )
     {
         return emplace(value.first, std::move(value.second));
diff --git a/tests/src/unit-ordered_map.cpp b/tests/src/unit-ordered_map.cpp
index 76ed4f34f..f380a9869 100644
--- a/tests/src/unit-ordered_map.cpp
+++ b/tests/src/unit-ordered_map.cpp
@@ -269,6 +269,11 @@ TEST_CASE("ordered_map")
         CHECK(com.find("vier") == com.end());
         CHECK(com.find(std::string("vier")) == com.end());
         CHECK(com.find(vier) == com.end());
+
+#ifdef JSON_HAS_CPP_17
+        CHECK(om.find(std::string_view("eins")) == om.begin());
+        CHECK(com.find(std::string_view("eins")) == com.begin());
+#endif
     }
 
     SECTION("insert")