westonpace commented on a change in pull request #9643:
URL: https://github.com/apache/arrow/pull/9643#discussion_r599026381
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File path: cpp/src/arrow/util/stl_util_test.cc
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@@ -92,5 +93,66 @@ TEST(StlUtilTest, ArgSortPermute) {
ExpectSortPermutation({b, c, d, e, a, f}, {4, 0, 1, 2, 3, 5}, 2);
}
+TEST(StlUtilTest, VectorFlatten) {
+ std::vector<int> a{1, 2, 3};
+ std::vector<int> b{4, 5, 6};
+ std::vector<int> c{7, 8, 9};
+ std::vector<std::vector<int>> vecs{a, b, c};
+ auto actual = FlattenVectors(vecs);
+ std::vector<int> expected{1, 2, 3, 4, 5, 6, 7, 8, 9};
+ ASSERT_EQ(expected, actual);
+}
+
+TEST(StlUtilTest, VectorMap) {
+ std::vector<int> input{1, 2, 3};
+ std::vector<std::string> expected{"1", "2", "3"};
+ auto actual = MapVector([](int item) { return std::to_string(item); },
input);
Review comment:
To be fair the STL didn't solve this case either, you cannot do
`std::bind(std::to_string, 7);`. So I think your approach is as good as it
gets :). If you're determined you can do `MapVector(static_cast<std::string
(*)(int)>(std::to_string), input);`
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