I find that tokenizer is rather complicated to use when the separators in a string are not the standard whites. I am looking at something that would simply give :
for (some_iterator word=word_begin(s, ";!") ; word!=word_end() ; ++word) { /* */ }
I have written the following code which works well but I wonder why. My questions are :
1.) the object "tokens" created in function wbegin(...) is deleted when the function exists; is it an issue when iterating over the elements?
2.) I use default constructor of the iterator as end iterator; is it legal? This allows me not to provide 2 times the string and the list of separators.
F. Bron
#include <iostream>
#include <string>
#include
typedef boost::tokenizer< boost::char_separator<char> >::iterator const_witerator ;
const_witerator wbegin(const std::string &s, const char *separators=" \t\n\f\r\v") {
boost::tokenizer< boost::char_separator<char> > tokens(s, boost::char_separator<char>(separators)) ;
return tokens.begin() ;
}
const_witerator wend() {
return const_witerator() ;
}
int main() {
std::string s(" a; bc ;def;ghi") ;
// -> [ a][ bc ][def][ghi]
for (const_witerator w=wbegin(s, ";") ; w!=wend() ; ++w) {
std::cout << '[' << *w << ']' ;
}
std::cout << '\n' ;
// -> [a][bc][def][ghi]
for (const_witerator w=wbegin(s, " ;") ; w!=wend() ; ++w) {
std::cout << '[' << *w << ']' ;
}
std::cout << '\n' ;
return 0 ;
}
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