westonpace commented on a change in pull request #9643:
URL: https://github.com/apache/arrow/pull/9643#discussion_r593081844
##########
File path: cpp/src/arrow/util/vector.h
##########
@@ -81,5 +84,53 @@ std::vector<T> FilterVector(std::vector<T> values,
Predicate&& predicate) {
return values;
}
+/// \brief Like MapVector, but where the function can fail.
+template <typename Fn, typename From = internal::call_traits::argument_type<0,
Fn>,
+ typename To = typename
internal::call_traits::return_type<Fn>::ValueType>
+Result<std::vector<To>> MaybeMapVector(Fn map, const std::vector<From>& src) {
+ std::vector<To> out;
+ out.reserve(src.size());
+ ARROW_RETURN_NOT_OK(
+ MaybeTransform(src.begin(), src.end(), std::back_inserter(out), map));
+ return out;
+}
+
+template <typename Fn, typename From = internal::call_traits::argument_type<0,
Fn>,
+ typename To = typename internal::call_traits::return_type<Fn>>
+std::vector<To> MapVector(Fn map, const std::vector<From>& source) {
Review comment:
Done.
##########
File path: cpp/src/arrow/util/vector.h
##########
@@ -81,5 +84,53 @@ std::vector<T> FilterVector(std::vector<T> values,
Predicate&& predicate) {
return values;
}
+/// \brief Like MapVector, but where the function can fail.
+template <typename Fn, typename From = internal::call_traits::argument_type<0,
Fn>,
+ typename To = typename
internal::call_traits::return_type<Fn>::ValueType>
+Result<std::vector<To>> MaybeMapVector(Fn map, const std::vector<From>& src) {
+ std::vector<To> out;
+ out.reserve(src.size());
+ ARROW_RETURN_NOT_OK(
+ MaybeTransform(src.begin(), src.end(), std::back_inserter(out), map));
+ return out;
+}
+
+template <typename Fn, typename From = internal::call_traits::argument_type<0,
Fn>,
+ typename To = typename internal::call_traits::return_type<Fn>>
+std::vector<To> MapVector(Fn map, const std::vector<From>& source) {
+ std::vector<To> out;
+ out.reserve(source.size());
+ std::transform(source.begin(), source.end(), std::back_inserter(out), map);
+ return out;
+}
+
+template <typename T>
+std::vector<T> FlattenVectors(const std::vector<std::vector<T>> vecs) {
Review comment:
Done.
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