Hi, On Thu, Jan 27, 2005 at 03:38:04PM -0800, David Brownell wrote:
I am attempting to split a string with the string_algo library, using the code below. It appears that the split algorithm is designed to split on instances of individual characters rather than sequences of characters. Is there something I can do to split on a substring? The code below illustrates the problem, where I am forces to use the is_any_of predicate rather than something that implies equality. It seems like this is a trivial use of the algorithm, so there could easily be something that I am missing.
typedef std::vector<boost::iterator_range<char const *> > ResultsType;
ResultsType results; static char const STRING[] = "this\r\nis\r\n\r\na test!";
boost::split(results, boost::iterator_range<char const *>(STRING, STRING + sizeof(STRING)), boost::is_any_of("\r\n")); // The problem is here. I would like to be able // to use something like equals, but split requires // a predicate that takes a single argument rather than // a range.
for(ResultsType::const_iterator rptr = results.begin(); rptr != results.end(); ++rptr) std::cout << "'" << std::string(rptr->begin(), rptr->end()) << "'\n";
It is possible to achieve what you want quite easily. However, split algorithm is not the right tool for this. Split is a high level wrapper over the split_iterator and it is quite specialized. So this is the code, that should work for you: #include <boost/algorithm/string/find_iterator.hpp> #include <boost/algorithm/string/finder.hpp> static char const STRING[] = "this\r\nis\r\n\r\na test!"; typedef boost::split_iterator<const char*> char_split_iterator; for(char_split_iterator It=char_split_iterator(STRING, boost::first_finder("\r\n"); It!=char_split_iterator(); ++It) { cout << *It << endl; } This example will split the STRING in the tokens, delimited by "\r\n". Note, that instead of first_finder, you can use any other one. Even the custom one. Check the documentation for more details. There is also an example in boost/libs/algorithm/string/example/split_example.cpp Regards, Pavol PS: I have not tried to compile the example, so please be patient it there are some errors.