On 9/19/06, Flex Ferrum wrote:

Hello, Alexander Shyrokov,

You wrote:

...

I want to convert values according to a map before inserting it into the list. What is a proper way to do that? I have this:

...

map m; vector<int> a,b;

...

for(vector<int>const_iterator i=a.begin();i!=a.end();++i) b.push_back(m[*i]);

...

I could use std::copy with std::back_inserter to add elements to b, but how do I convert it first? Should I write my own version of back_inserter for that?

...

copy(a.begin(),a.end(),my_back_inserter(b,m));

...

Thanks.

Try this:

#include

using namespace boost; using namespace boost::lambda;

//... //...

map m; vector<int> a,b; std::transform(a.begin(), a.end(), std::back_inserter(b), var(m)[_1]);

I would be really interested to know which of the various styles people find the best. Tony