🏗️ adding anonymous namespace

test/src/unit-comparison.cpp

@@ -32,6 +32,8 @@ SOFTWARE.
 #include <nlohmann/json.hpp>
 using nlohmann::json;
 
+namespace
+{
 // helper function to check std::less<json::value_t>
 // see https://en.cppreference.com/w/cpp/utility/functional/less
 template <typename A, typename B, typename U = std::less<json::value_t>>
@@ -39,6 +41,7 @@ bool f(A a, B b, U u = U())
 {
     return u(a, b);
 }
+}
 
 TEST_CASE("lexicographical comparison operators")
 {