[boost] Re: [bind] Patch that enables pass-by-value

From: Daniel Wallin (dalwan01_at_[hidden])
Date: 2004-06-16 06:29:05

Lars Rune Nøstdal wrote:
> Hi,
> I'm a new user of this library, so not sure if this is a good idea or the best way to do this.
> 
> 
> void f(int x)
> {
>         cout << "f(int): " << x << endl;
> }
> 
> 
> int x = 0;
> bind(f, _1)(x);
> //bind(f, _1)(1);  // Does not work.
> bind(f, _1)(val<int>(1)); // But this does after patching.
> 
> 
> This enables the user to pass-by-value if he specifies it explicitly, here is the patch:

Or you can just do this:

   template<class T>
   T const& const_ref(T const& x)
   {
       return x;
   }

   bind(f, _1)(const_ref(1));

-- 
Daniel Wallin