Fix clang-tidy 22 findings in the json_view headers

Silence bugprone-casting-through-void for the SSE loads (a reinterpret_cast
would trip -Wcast-align=strict), use auto for a cast initialiser, add
parentheses to a mixed expression, and name bugprone-std-namespace-modification
in the NOLINTs of the tuple_size/tuple_element specialisations.

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

include/nlohmann/detail/view/lookup.hpp

@@ -132,7 +132,7 @@ 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): idx is an index, not a character
     return (idx < zero || static_cast<IntegerType>(result) != idx) ? (std::numeric_limits<SizeType>::max)() : result;
 }
 

include/nlohmann/detail/view/simd.hpp

@@ -98,7 +98,7 @@ NLOHMANN_VIEW_ALWAYS_INLINE const unsigned char* vector_plain_run(const unsigned
             return p + (count_trailing_zeros(bits) >> 2u);
         }
 #else
-        const __m128i in = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(p)));
+        const __m128i in = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(p))); // NOLINT(bugprone-casting-through-void)
         const __m128i special = _mm_or_si128(_mm_or_si128(_mm_cmpeq_epi8(in, _mm_set1_epi8('"')), _mm_cmpeq_epi8(in, _mm_set1_epi8('\\'))),
                                              _mm_cmplt_epi8(in, _mm_set1_epi8(0x20)));
         const auto bits = static_cast<std::uint64_t>(static_cast<unsigned>(_mm_movemask_epi8(special)));
@@ -293,15 +293,15 @@ NLOHMANN_VIEW_SSSE3_TARGET NLOHMANN_VIEW_NOINLINE inline const unsigned char* sc
 #else
     // the same with SSSE3 (pshufb for the table lookups; nibbles from 16-bit
     // shifts, as there are no byte shifts)
-    const __m128i t1h = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(lookup::byte_1_high.data())));
-    const __m128i t1l = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(lookup::byte_1_low.data())));
-    const __m128i t2h = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(lookup::byte_2_high.data())));
+    const __m128i t1h = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(lookup::byte_1_high.data()))); // NOLINT(bugprone-casting-through-void)
+    const __m128i t1l = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(lookup::byte_1_low.data()))); // NOLINT(bugprone-casting-through-void)
+    const __m128i t2h = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(lookup::byte_2_high.data()))); // NOLINT(bugprone-casting-through-void)
     const __m128i nibble = _mm_set1_epi8(0x0F);
     const __m128i zero = _mm_setzero_si128();
     __m128i prev = zero;
     while (e - block >= 16)
     {
-        const __m128i in = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(block)));
+        const __m128i in = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(block))); // NOLINT(bugprone-casting-through-void)
         const __m128i special = _mm_or_si128(_mm_or_si128(_mm_cmpeq_epi8(in, _mm_set1_epi8('"')), _mm_cmpeq_epi8(in, _mm_set1_epi8('\\'))),
                                              _mm_cmpeq_epi8(_mm_subs_epu8(in, _mm_set1_epi8(0x1F)), zero)); // in < 0x20
         const __m128i prev1 = _mm_alignr_epi8(in, prev, 15);
@@ -315,7 +315,7 @@ NLOHMANN_VIEW_SSSE3_TARGET NLOHMANN_VIEW_NOINLINE inline const unsigned char* sc
         const auto err_bits = ~static_cast<unsigned>(_mm_movemask_epi8(_mm_cmpeq_epi8(err, zero))) & 0xFFFFu;
         if (special_bits != 0)
         {
-            const unsigned k = static_cast<unsigned>(count_trailing_zeros(static_cast<std::uint64_t>(special_bits)));
+            const auto k = static_cast<unsigned>(count_trailing_zeros(static_cast<std::uint64_t>(special_bits)));
             if ((err_bits & ((2u << k) - 1u)) == 0)
             {
                 return block + k;

include/nlohmann/json_view.hpp

@@ -725,7 +725,7 @@ class basic_json_view
         // the end is unknown: assume a few bytes per node, the output buffer
         // grows should the value be larger
         const auto nodes = static_cast<std::size_t>(document_data::after(m_node) - m_node);
-        return (std::min)(m_doc->size - m_node->off, static_cast<std::size_t>(1024) + nodes * 16);
+        return (std::min)(m_doc->size - m_node->off, static_cast<std::size_t>(1024) + (nodes * 16));
     }
 
     /// the value of the first member with this key, or a discarded view
@@ -1212,11 +1212,11 @@ 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>());