From d21abfc35e37082b126e4623a3bdafe16a7d21b0 Mon Sep 17 00:00:00 2001
From: Fredrik Sandhei <fredrik.sandhei@gmail.com>
Date: Sat, 7 Oct 2023 15:26:14 +0200
Subject: [PATCH] Replace scalar type comparison restriction with one extended
 for compatible types.

---
 include/nlohmann/json.hpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/nlohmann/json.hpp b/include/nlohmann/json.hpp
index f7fac1fb4..2e733b5d2 100644
--- a/include/nlohmann/json.hpp
+++ b/include/nlohmann/json.hpp
@@ -3694,9 +3694,11 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
 
     /// @brief comparison: equal
     /// @sa https://json.nlohmann.me/api/basic_json/operator_eq/
-    template<typename ScalarType>
-    requires std::is_scalar_v<ScalarType>
-    bool operator==(ScalarType rhs) const noexcept
+    template < typename CompatibleType,
+               typename U = detail::uncvref_t<CompatibleType>,
+               detail::enable_if_t <
+                   !detail::is_basic_json<U>::value && detail::is_compatible_type<basic_json_t, U>::value, int > = 0 >
+    bool operator==(CompatibleType rhs) const noexcept
     {
         return *this == basic_json(rhs);
     }