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C++ strict conversion fixes for flatbuffer_builder.h (#8062) (#8065)

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Enables to compile flatbuffer_builder.h with strict settings -Wconversion -Wsign-conversion.
Also, add asserts to verify the conversions.
This commit is contained in:
Markus Junginger
2023-09-29 16:30:23 +02:00
committed by GitHub
parent eb40a54672
commit 56e2bc30b0
1 changed files with 8 additions and 5 deletions
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13
include/flatbuffers/flatbuffer_builder.h
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@@ -45,8 +45,9 @@ inline voffset_t FieldIndexToOffset(voffset_t field_id) {
// Should correspond to what EndTable() below builds up.
const voffset_t fixed_fields =
2 * sizeof(voffset_t); // Vtable size and Object Size.
return fixed_fields + field_id * sizeof(voffset_t);
}
size_t offset = fixed_fields + field_id * sizeof(voffset_t);
FLATBUFFERS_ASSERT(offset < std::numeric_limits<voffset_t>::max());
return static_cast<voffset_t>(offset);}
template<typename T, typename Alloc = std::allocator<T>>
const T *data(const std::vector<T, Alloc> &v) {
@@ -709,7 +710,7 @@ template<bool Is64Aware = false> class FlatBufferBuilderImpl {
typename std::enable_if<is_64, void>::type ForceVectorAlignment64(
const size_t len, const size_t elemsize, const size_t alignment) {
// If you hit this assertion, you are trying to force alignment on a
// vector with offset64 after serializing a 32-bit offset.
// vector with offset64 after serializing a 32-bit offset.
FLATBUFFERS_ASSERT(GetSize() == length_of_64_bit_region_);
// Call through.
@@ -879,7 +880,9 @@ template<bool Is64Aware = false> class FlatBufferBuilderImpl {
/// where the vector is stored.
template<class It>
Offset<Vector<Offset<String>>> CreateVectorOfStrings(It begin, It end) {
auto size = std::distance(begin, end);
auto distance = std::distance(begin, end);
FLATBUFFERS_ASSERT(distance >= 0);
auto size = static_cast<size_t>(distance);
auto scratch_buffer_usage = size * sizeof(Offset<String>);
// If there is not enough space to store the offsets, there definitely won't
// be enough space to store all the strings. So ensuring space for the
@@ -889,7 +892,7 @@ template<bool Is64Aware = false> class FlatBufferBuilderImpl {
buf_.scratch_push_small(CreateString(*it));
}
StartVector<Offset<String>>(size);
for (auto i = 1; i <= size; i++) {
for (size_t i = 1; i <= size; i++) {
// Note we re-evaluate the buf location each iteration to account for any
// underlying buffer resizing that may occur.
PushElement(*reinterpret_cast<Offset<String> *>(