Re: [boost] New libraries implementing C++11 features in C++03

Subject: Re: [boost] New libraries implementing C++11 features in C++03
From: Joel de Guzman (joel_at_[hidden])
Date: 2011-11-25 08:58:04

On 11/25/2011 9:21 PM, Christopher Jefferson wrote:
>
> Sorry to ask you another problem, but could you try another test?
> 
> The following code shows a small example, which comes from a real program of mine. I
have changed my old out-of-line code to use boost local. Note that in practice there are
many different types which implement my 'vars' interface (getMax/getMin/setMax/setMin).
> 
> #include <iostream>
> #include <string>
> #include <vector>
> #include <algorithm>
> #include "local/boost/local/function.hpp"
> 
> 
> template<typename T>
> struct Var
> {
>     void setMax(int i) {}
>     void setMin(int i) {}
>     int getMax() { return 0; }
>     int getMin() { return 0; }
> };
> 
> template<typename T>
> void squeeze_vars_local(std::vector<T>& vec, int i)
> {
>   
>     void BOOST_LOCAL_FUNCTION_PARAMS_TPL(T& t, bind i)
>     { 
>         t.first.setMax(t.second.getMax() - i); 
>         t.second.setMin(t.first.getMin() + i);
>     } BOOST_LOCAL_FUNCTION_NAME(squeeze);
> 
>     std::for_each(vec.begin(), vec.end(), squeeze);
> }
> 
> int main(void)
> {
>     std::vector<std::pair<Var<int>, Var<double> > > v;
>     squeeze_vars_local(v,2);
> }
> 

> In the past I tried turning this into phoenix code, and failed. I'd be genuinely
interested to know what it would look like as a phoenix function.

Here's the phoenix functions rendition of that:

  http://pastebin.com/QWnHiKkv

Regards,
-- 
Joel de Guzman
http://www.boostpro.com
http://boost-spirit.com