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Avoid memcpy call for empty vectors (#6111)

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Co-authored-by: kuddai <kuddai92@gmail.com>
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Ruslan Burakov
2020-09-10 23:03:15 +03:00
committed by GitHub
parent 92a8c1a0f2
commit f5ab24bc41
1 changed files with 3 additions and 0 deletions
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include/flatbuffers/flatbuffers.h
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@@ -1607,6 +1607,9 @@ class FlatBufferBuilder {
// causing the wrong overload to be selected, remove it. // causing the wrong overload to be selected, remove it.
AssertScalarT<T>(); AssertScalarT<T>();
StartVector(len, sizeof(T)); StartVector(len, sizeof(T));
if (len == 0) {
return Offset<Vector<T>>(EndVector(len));
}
// clang-format off // clang-format off
#if FLATBUFFERS_LITTLEENDIAN #if FLATBUFFERS_LITTLEENDIAN
PushBytes(reinterpret_cast<const uint8_t *>(v), len * sizeof(T)); PushBytes(reinterpret_cast<const uint8_t *>(v), len * sizeof(T));