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Subject: Re: [Boost-users] [Optional] Lazy initialized optional
From: Gavin Lambert (boost_at_[hidden])
Date: 2018-11-14 22:27:06

On 14/11/2018 23:03, Martijn Otto wrote:
> If you do it in a separate class instead, you can clear the callback
> after invoking it. Then checking whether a callback exists will tell
> you whether the object was initialized.

Unless the callback itself can produce an optional value.

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