[C++] row_wise_conversion example doesn't correspond to ListBuilder constructor arguments

[asfimport]

In the row_wise_conversion code example we find:

    std::shared_ptr<DoubleBuilder> components_values_builder =
        std::make_shared<DoubleBuilder>(arrow::default_memory_pool());
    arrow::ListBuilder components_builder(arrow::default_memory_pool(),
        components_values_builder);

This generates some compile time errors since the second argument of the ListBuilder constructor expects a unique pointer.

However, I guess the example shows the correct case, where we want to still be able to use the DoubleBuilder after constructing the ListBuilder, so I probably shouldn't std::move it to the constructor as a unique_ptr.

I'm not sure how to fix this as I don't know which functionality is desired.

Reporter: Johan Peltenburg / @johanpel
Assignee: Wes McKinney / @wesm

PRs and other links:

• GitHub Pull Request #1157

_{Note: This issue was originally created as ARROW-1543. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
Sorry about that, this example has bit-rotted due to some API changes (i.e. shared to unique ptr) in the last 6 months. It should not be happening again very soon, but we'll need to conform this to the current API

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 1157
#1157