Re: [Boost-users] Python list comprehension-like syntax in C++

From: Simon Buchan (simon_at_[hidden])
Date: 2005-09-22 19:34:52

Tzu-Chien Chiu wrote:
> In Pyhon:
> 
> y = [foo(_1) for _1 in x]
> 
> In C++:
> 
> list<int> x;
> x.push_back(...);
> ..
> 
> list<int> y;
> for (list<int>::iterator it = x.begin(); x.end() != it; ++ it)
>   y.push_back( foo(y) );
> 
> With boost, can we write the Python-like statement:
> 
> copy( x.begin(), x.end(), magic_back_inserter(foo(_1), y) ); // pseudo-code
> 
> --
> Tzu-Chien Chiu,
> 3D Graphics Hardware Architect
> <URL:http://www.csie.nctu.edu.tw/~jwchiu>
But what would an expression-template version look like?
y = for_( _1 >> in >> x)[foo]
That is what the composition operator would be for:
operator _, say, so we could do :
foo for_ _1 in x