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https://issues.apache.org/jira/browse/HDFS-9117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15009206#comment-15009206
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Bob Hansen commented on HDFS-9117:
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{quote}
bq. With the templated getter, there is no way to tell whether or not
config.get<int>("") is implemented.
You can do it via (1) explicitly instantiating the templates, and (2) having a
generic template which only contains a static_assert.
{quote}
The options there seem to be either putting all of the implementation in the
header file (messy), or having a config_impl.h that is included and then once
again hides what types are supported. Is there a way to forward-declare the
specialization without muddying the interface with implementation?
> Config file reader / options classes for libhdfs++
> --------------------------------------------------
>
> Key: HDFS-9117
> URL: https://issues.apache.org/jira/browse/HDFS-9117
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Affects Versions: HDFS-8707
> Reporter: Bob Hansen
> Assignee: Bob Hansen
> Attachments: HDFS-9117.HDFS-8707.001.patch,
> HDFS-9117.HDFS-8707.002.patch, HDFS-9117.HDFS-8707.003.patch,
> HDFS-9117.HDFS-8707.004.patch, HDFS-9117.HDFS-8707.005.patch,
> HDFS-9117.HDFS-8707.006.patch, HDFS-9117.HDFS-8707.008.patch,
> HDFS-9117.HDFS-8707.009.patch, HDFS-9117.HDFS-8707.010.patch,
> HDFS-9117.HDFS-8707.011.patch, HDFS-9117.HDFS-8707.012.patch,
> HDFS-9117.HDFS-8707.013.patch, HDFS-9117.HDFS-8707.014.patch,
> HDFS-9117.HDFS-8707.015.patch, HDFS-9117.HDFS-9288.007.patch
>
>
> For environmental compatability with HDFS installations, libhdfs++ should be
> able to read the configurations from Hadoop XML files and behave in line with
> the Java implementation.
> Most notably, machine names and ports should be readable from Hadoop XML
> configuration files.
> Similarly, an internal Options architecture for libhdfs++ should be developed
> to efficiently transport the configuration information within the system.
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