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[C++] Fix Undefined behavior for zero length vectors (#5355)

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* Fix Undefined behavior for zero length vectors

* Change fix for UBSan
This commit is contained in:
emkornfield
2019-05-30 16:13:34 -07:00
committed by Wouter van Oortmerssen
parent 9d92fd92e1
commit 79f0df3dfc
1 changed files with 8 additions and 2 deletions
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10
include/flatbuffers/flatbuffers.h
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@@ -892,10 +892,16 @@ inline voffset_t FieldIndexToOffset(voffset_t field_id) {
template<typename T, typename Alloc>
const T *data(const std::vector<T, Alloc> &v) {
return v.empty() ? nullptr : &v.front();
// Eventually the returned pointer gets passed down to memcpy, so
// we need it to be non-null to avoid undefined behavior.
static uint8_t t;
return v.empty() ? reinterpret_cast<const T*>(&t) : &v.front();
}
template<typename T, typename Alloc> T *data(std::vector<T, Alloc> &v) {
return v.empty() ? nullptr : &v.front();
// Eventually the returned pointer gets passed down to memcpy, so
// we need it to be non-null to avoid undefined behavior.
static uint8_t t;
return v.empty() ? reinterpret_cast<T*>(&t) : &v.front();
}
/// @endcond