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P1020R1 Smart pointer creation with default initialization #2468

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merged 1 commit into from Nov 26, 2018
Merged

P1020R1 Smart pointer creation with default initialization #2468

merged 1 commit into from Nov 26, 2018

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burblebee
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[memory.syn] Move return types to before function names for consistency.

Fixes #2424.

@jensmaurer jensmaurer added this to the post-2018-11 milestone Nov 14, 2018
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@burblebee, could you please fix the overfull \hbox here? Thanks.

@jensmaurer jensmaurer added the changes requested Changes to the wording or approach have been requested and not yet applied. label Nov 15, 2018
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@jensmaurer I think it's complaining about this text in utilities.tex around line 9811 because allocate_shared_default_init doesn't fit:

\item
  When a (sub)object of non-array type \tcode{U} is initialized by
  \tcode{make_shared_default_init} or \tcode{allocate_shared_default_init},
  it is initialized via the expression \tcode{::new(pv) U},
  where \tcode{pv} has type \tcode{void*} and
  points to storage suitable to hold an object of type \tcode{U}.

How to fix???

@tkoeppe
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tkoeppe commented Nov 15, 2018

Feel free to add hyphenation hints (\-) into the code.

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Feel free to add hyphenation hints (\-) into the code.

I'm trying to fix similar Overfull issues in motions-2018-11-lwg-4 with no luck, using both \- and \brk{}. In LWG3116 for example (commit a6c9c9e), I've tried the following but still latex complains:

initializing the base class with
\tcode{basic_istream<\brk{}charT, \brk{}traits>(\brk{}addressof(\brk{}sb))}\iref{istream}
and initializing \tcode{sb} with
\tcode{basic_string\-buf<\brk{}charT, \brk{}traits, \brk{}Allocator>(\brk{}which | \brk{}ios_base::in)}\iref{stringbuf.cons}.

Oddly enough, when I misspelled \brk{} as brk{}, that fixed things!

How can I tell exactly what word in the line(s) it's complaining about? The Overfull warning is:

Overfull \hbox (3.5105pt too wide) in paragraph at lines 7951--7960
\T1/lmr/m/n/10 (-20) class with \T1/lmtt/m/n/10 basic_-istream<charT, traits>(a
ddressof(sb)) \T1/lmr/m/n/10 (-20) ([][]27.7.4.1[][]) and ini-tial-iz-ing \T1/l
mtt/m/n/10 sb \T1/lmr/m/n/10 (-20) with \T1/lmtt/m/n/10 basic_-

@burblebee
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@tkoeppe I was able to fix motions-2018-11-lwg-18 by forcing a linebreak. It's the cleanest solution wrt readability, and there is no resulting underflow.

@jensmaurer jensmaurer removed the changes requested Changes to the wording or approach have been requested and not yet applied. label Nov 15, 2018
jensmaurer
jensmaurer requested changes Nov 20, 2018
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source/utilities.tex
template<class T, ...>
shared_ptr<T> make_shared_default_init(@\placeholdernc{args}@);
template<class T, class A, ...>
shared_ptr<T> allocate_shared_default_init(const A& a, @\placeholdernc{args}@);
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This seems broken (also in the ingress paper): The whole point of ..._default_init is to have no arguments, so why are we talking about "args" here? Also, the pack-like "..." in the template argument list should go.

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Ah, that's to cover "size_t N" for the array case. The not-really parallelism to make_shared(args) is highly misleading.

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@jensmaurer Can you open a separate issue for this?

@jensmaurer jensmaurer added the changes requested Changes to the wording or approach have been requested and not yet applied. label Nov 20, 2018
@burblebee burblebee removed the changes requested Changes to the wording or approach have been requested and not yet applied. label Nov 23, 2018
@zygoloid
P1020R1 Smart pointer creation with default initialization
5f91adf 
[memory.syn] Move return types to before function names for consistency.
@zygoloid zygoloid merged commit 9bfa2e5 into master Nov 26, 2018
@jensmaurer jensmaurer deleted the motions-2018-11-lwg-18 branch October 19, 2019 20:06
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