[jira] [Commented] (MESOS-5072) Add variadic constructor for Option

["Benjamin Bannier (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MESOS-5072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15490061#comment-15490061 ] 

Benjamin Bannier commented on MESOS-5072:
-----------------------------------------

Are you still working on this [~a10gupta]? If not please unassign yourself.

> Add variadic constructor for Option
> -----------------------------------
>
>                 Key: MESOS-5072
>                 URL: https://issues.apache.org/jira/browse/MESOS-5072
>             Project: Mesos
>          Issue Type: Improvement
>          Components: stout
>            Reporter: Benjamin Bannier
>            Assignee: Abhishek Dasgupta
>
> Currently an {{Option<T>}} can be constructed from an {{U}} if in turn a {{T}} is constructable from an {{U}}, e.g.,
> {code}
> // Construct a std::string from a string literal.
> Option<string> s{"fnord"};
> {code}
> We should extend this to permit this kind of construct from more than one parameter, i.e.,
> {code}
> // Construct a vector of strings from a string initializer list.
> Option<vector<string>> v{"Browny", "Whitey", "Blacky"};
> {code}
> Currently users need to duplicate the type which e.g., poses the danger of
> inadvertently type conversions,
> {code}
> Option<vector<string>> v{<vector<string>>{"Browny", "Whitey", "Blacky"}};
> {code}
> It seems just making the {{U}} in the respective {{Option}} constructor
> variadic would already be enough to support this, but it would be highly
> desirable to remove explicit, redundant types in existing constructions of {{Options}} in the code base.



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