Re: [Boost-users] [Lambda] nitty gritty detail...?

Subject: Re: [Boost-users] [Lambda] nitty gritty detail...?
From: Robert Jones (robertgbjones_at_[hidden])
Date: 2011-03-31 14:27:30

On Thu, Mar 31, 2011 at 4:47 PM, Steven Watanabe <watanabesj_at_[hidden]>wrote:

> AMDG
>
>
> On 03/31/2011 08:29 AM, Robert Jones wrote:
>
>> From Bjorn Karlsson's book, P297...
>>>
>>
>> int i;
>> int value = 12;
>> var(i) = ( if_then_else_return( _1>=10, constant(10),_1) )(value);
>>
>> Why does the assignment LHS need to be wrapped in var()?
>>
>>
> Because operator= must be a member function.
>
>
Nope, still not getting it! Stop me when I err...

if_then_else_return(...) defines a unary functor
it_then_else_return(...)( value) evaluates that functor, and returns what?

Some type of integer I think? So doesn't the assignment simply perform
assignment of an integer, by copy? And that doesn't need operator= to
a member of anything?

Thanks

- R.