Re: [Boost-users] [bind][lambda] overriding return value

From: Robert Jones (robertgbjones_at_[hidden])
Date: 2008-07-21 17:01:16

On Mon, Jul 21, 2008 at 9:28 PM, Steven Watanabe <watanabesj_at_[hidden]>
wrote:

>
> David Rodríguez Ibeas wrote:
>
>> Hi,
>>
>>   Is it possible to override/generate a return value? I want to connect a
>> signal that has a bool return value to a method that has a void return type,
>> generating always a true return.
>>
>> class X
>> {
>> public:
>>   void f();
>> };
>> boost::signal< bool () > sgn;
>>
>> X x;
>> sgn.connect( boost::bind( &X::f, &x ) ); // error, signal has bool return,
>> method doesn't
>>
>
> Using lambda, you can use the comma operator.
>
> sgn.connect((boost::lambda::bind(&X::f, &x), true))
>
>
That's brilliant - I needed exactly this last month! I wish I'd thought of
that!

Cheers, Rob.