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Subject: Re: [boost] [optional] Suggestion for adding an optional_number class
From: Hans Dembinski (hans.dembinski_at_[hidden])
Date: 2017-07-26 11:41:20

> On 25. Jul 2017, at 15:46, Sergey Mitsyn via Boost <boost_at_[hidden]> wrote:
> FYI there was a proposal recently for optional with the same purpose; unfortunately, it went nowhere:

There was also boost::markable with a similar intend:

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