Fix the clang-tidy 22 findings in json_view and its tests

The same changes as on the dump branch, where they were first made, so
that this branch passes clang-tidy on its own.

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

include/nlohmann/detail/view/lookup.hpp

@@ -127,7 +127,7 @@ template<typename SizeType, typename IntegerType>
 SizeType to_index(IntegerType idx) noexcept
 {
     const IntegerType zero = 0;
-    const auto result = static_cast<SizeType>(idx);
+    const auto result = static_cast<SizeType>(idx); // NOLINT(bugprone-signed-char-misuse,cert-str34-c): negative values are mapped below
     return (idx < zero || static_cast<IntegerType>(result) != idx) ? (std::numeric_limits<SizeType>::max)() : result;
 }
 

include/nlohmann/json_view.hpp

@@ -1062,7 +1062,7 @@ using ordered_json_view = basic_json_view<ordered_json>;
 NLOHMANN_JSON_NAMESPACE_END
 
 // tuple protocol for the items of basic_json_view::items() (structured bindings)
-namespace std // NOLINT(cert-dcl58-cpp)
+namespace std // NOLINT(cert-dcl58-cpp,bugprone-std-namespace-modification)
 {
 
 #if defined(__clang__)
@@ -1071,11 +1071,11 @@ namespace std // NOLINT(cert-dcl58-cpp)
     #pragma clang diagnostic ignored "-Wmismatched-tags"
 #endif
 template<typename View>
-class tuple_size<::nlohmann::detail::view::view_item<View>> // NOLINT(cert-dcl58-cpp)
+class tuple_size<::nlohmann::detail::view::view_item<View>> // NOLINT(cert-dcl58-cpp,bugprone-std-namespace-modification)
     : public std::integral_constant<std::size_t, 2> {};
 
 template<std::size_t N, typename View>
-class tuple_element<N, ::nlohmann::detail::view::view_item<View>> // NOLINT(cert-dcl58-cpp)
+class tuple_element<N, ::nlohmann::detail::view::view_item<View>> // NOLINT(cert-dcl58-cpp,bugprone-std-namespace-modification)
 {
   public:
     using type = decltype(std::declval<::nlohmann::detail::view::view_item<View>>().template get<N>());