Re: [boost] [serialization] Passing literals to oarchive

Subject: Re: [boost] [serialization] Passing literals to oarchive
From: Robert Ramey (ramey_at_[hidden])
Date: 2015-03-29 11:35:03

Bjorn Reese wrote
> On 03/27/2015 05:49 PM, Robert Ramey wrote:
> 
>> In this case the problem is different.  A parameter value placed on the
>> stack cannot be passed by "const T & t".  This syntax assumes and
>> enforces
> 
> Why not?

It generates a compile time error when you pass an rvalue.

>> Now one could add yet one more layer of TMP code to distinguish
>> between tracked and untracked types and handle them differently.
>> But that would introduce another layer of complexity and hide even
>> more what is going on.  I would be reluctant to do this.
> 
> Making a special case for primitive types is not too bad. See the
> attached patch.

Since I wrote this, I've been considering it.  I looked at your patch.
I would likely condition it on the type being a tracked or untracked
type rather than being on a primitive type.

>> I'm presuming that this is not a common case.
> 
> I encounter it all the time in unit tests, and occasionally in other
> code.

the reason I would think that it's not a common case is the following:

ar << 42;  // put the value of 42 into the archive
...

ar >> ?;  // what do we do with the result we're retrieving?

So I'm not seeing where this comes up.

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