pitrou commented on code in PR #36418:
URL: https://github.com/apache/arrow/pull/36418#discussion_r1259808644
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cpp/src/arrow/buffer.h:
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@@ -137,6 +140,25 @@ class ARROW_EXPORT Buffer {
/// \return a new Buffer instance
static std::shared_ptr<Buffer> FromString(std::string data);
+ /// \brief Construct an immutable buffer that takes ownership of the contents
+ /// of an std::vector (without copying it).
+ ///
+ /// \param[in] vec a vector to own
+ /// \return a new Buffer instance
+ template <typename T>
+ static std::shared_ptr<Buffer> FromVectorOfTrivial(std::vector<T> vec) {
+ static_assert(std::is_trivial_v<T>);
+ auto* data = reinterpret_cast<uint8_t*>(vec.data());
+ auto size_in_bytes = static_cast<int64_t>(vec.size() * sizeof(T));
Review Comment:
Should we special case `size == 0`, since then the data pointer may be null?
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