Silence CodeQL false positive warnings (#4942)

Author: StephanTLavavej

stl/inc/__msvc_string_view.hpp

@@ -665,7 +665,7 @@ class _String_bitmap { // _String_bitmap for character types
     }
 
     constexpr bool _Match(const _Elem _Ch) const noexcept { // test if _Ch is in the bitmap
-        return _Matches[static_cast<unsigned char>(_Ch)];
+        return _Matches[static_cast<unsigned char>(_Ch)]; // lgtm [cpp/unclear-array-index-validation]
     }
 
 private:
@@ -1331,7 +1331,7 @@ class basic_string_view { // wrapper for any kind of contiguous character buffer
 #if _CONTAINER_DEBUG_LEVEL > 0
         _STL_VERIFY(_Off < _Mysize, "string_view subscript out of range");
 #endif // _CONTAINER_DEBUG_LEVEL > 0
-        return _Mydata[_Off];
+        return _Mydata[_Off]; // lgtm [cpp/unclear-array-index-validation]
     }
 
     _NODISCARD constexpr const_reference at(const size_type _Off) const {

stl/inc/charconv

@@ -228,7 +228,7 @@ _STL_INTERNAL_STATIC_ASSERT(_STD size(_Digit_from_byte) == 256);
 
 _NODISCARD _CONSTEXPR23 unsigned char _Digit_from_char(const char _Ch) noexcept {
     // convert ['0', '9'] ['A', 'Z'] ['a', 'z'] to [0, 35], everything else to 255
-    return _Digit_from_byte[static_cast<unsigned char>(_Ch)];
+    return _Digit_from_byte[static_cast<unsigned char>(_Ch)]; // lgtm [cpp/unclear-array-index-validation]
 }
 
 template <class _RawTy>

stl/inc/xutility

@@ -4707,7 +4707,7 @@ _OutCtgIt _Copy_memmove(_CtgIt _First, _CtgIt _Last, _OutCtgIt _Dest) {
     const auto _Count           = static_cast<size_t>(_Last_ch - _First_ch);
     _CSTD memmove(_Dest_ch, _First_ch, _Count);
     if constexpr (is_pointer_v<_OutCtgIt>) {
-        return reinterpret_cast<_OutCtgIt>(_Dest_ch + _Count);
+        return reinterpret_cast<_OutCtgIt>(_Dest_ch + _Count); // lgtm [cpp/incorrect-string-type-conversion]
     } else {
         return _Dest + static_cast<_Iter_diff_t<_OutCtgIt>>(_LastPtr - _FirstPtr);
     }

stl/src/StlLCMapStringA.cpp

@@ -82,10 +82,12 @@ extern "C" _CRTIMP2 int __cdecl __crtLCMapStringA(_In_opt_z_ LPCWSTR LocaleName,
                 return retval;
             }
 
+            const auto wide_dest = reinterpret_cast<LPWSTR>(lpDestStr); // lgtm [cpp/incorrect-string-type-conversion]
+
             // do string mapping
             if (0
-                == LCMapStringEx(LocaleName, dwMapFlags, inwbuffer.get(), inbuff_size,
-                    reinterpret_cast<LPWSTR>(lpDestStr), cchDest, nullptr, nullptr, 0)) {
+                == LCMapStringEx(
+                    LocaleName, dwMapFlags, inwbuffer.get(), inbuff_size, wide_dest, cchDest, nullptr, nullptr, 0)) {
                 return retval;
             }
         }