Re: [boost] [GSoC][Phoenix3] Regarding mutability of arguments passed to phoenix expressions

Subject: Re: [boost] [GSoC][Phoenix3] Regarding mutability of arguments passed to phoenix expressions
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2010-06-14 05:59:45

Eric Niebler wrote:
> On 6/12/2010 5:34 PM, Mathias Gaunard wrote:
>> For captures, I don't see how anyone would want to do anything but
>> capture everything by reference.
>>
> 
> function<int(int)> plus_i( int i )
> {
>    return _1 + i;
> }
> 
> If you capture i by reference, this code will compile but crash at
> runtime. Have fun debugging it! :-)

My main use for lambdas (be them C++0x or DSEL ones) is to pass them 
directly to a higher-order function or an iterator adapter; I never 
store them past their lifetime.

I'm not sure lambdas in callbacks or signals scenarios is where they 
really shine.