Pavol Droba wrote:
suppose I have a string "module.foo1.port" and want to get the second dot-separated element. I think I can use the 'split' algorithm, but it does not look very convenient, I need to declare container, then call split and then obtain the result.
You can also use split_iterator.
#include <boost/algorithm/string/find_iterator.hpp> #include <boost/algorithm/string/finder.hpp>
using namespace boost;
std::string str="module.foo1.port"; typedef split_iterator<std::string::iterator> string_split;
string_split it(str, token_finder(is_any_of(".")); // *it="module" ++it; // *it="foo1" ++it; // *it="port" ++it; // it.eof()==true it=string_split();
*it is an iterator_range, pointing to the input. You can easily convert it to a string
std::string match=copy_iterator_range<std::string>(*it);
Ok, noted. Though what I have now: vector<string> parts; split(parts, p.options[i].string_key, is_any_of(".")); if (parts.size() > 2) modules.insert(parts[1]); has roughly the same size. BTW, looking at http://www.boost.org/regression-logs/cs-win32_metacomm/doc/html/class.boost.... I don't see any explanation what's FinderT. Maybe the phrase Split iterator encapsulates a Finder should include a link to the definition of the 'Finder' concept? Also, the name 'token_finder' is a bit misleading. I associate it with item returned by the lexer, which can have several characters. From the docs it seems that the 'token_finder' searches for a single character, so maybe it should be 'char_finder'? It looks like the word 'token' is used in just a couple of places. - Volodya