Ok, i'm doing this and it works fine.
end = std::find(arToken.begin() + nStart, arToken.end(), ".");
I want to extend the . to include ! and ? so it finds periods(.), exclamation mark(!), and question mark(?).
Should i use regex in the term?
TIA
views:
221answers:
3
+2
A:
use a predicate and std::find_if like this:
struct has_char {
has_char(const char *s) : str(s) {}
bool operator() (const char ch) const {
return str.find(ch) != std::string::npos;
}
private:
std::string str;
};
end = std::find_if(arToken.begin() + nStart, arToken.end(), has_char(".!?"));
Evan Teran
2009-10-05 20:21:00
Can you write that as if it was free function, so I could understand little easier. Thanks
Jeremiah
2009-10-05 20:26:50
since you're using std::string, you may want to stick with the methods that class provides. I.e. in your operator() method, you can "return s.find(ch) != npos;"
Tim
2009-10-05 20:28:31
also, to be strict about it, has_char should inherit from public std::unary_function<const char, bool> -- which will require #include<functional>
Tim
2009-10-05 20:30:02
@jerimiah: it can't be a free function cause it has state. Using a class with an overloaded `operator()` is the proper way to go if you use `find_if`
Evan Teran
2009-10-05 20:31:38
@Tim: it is usually a good idea to inherit from `std::unary_function<>`, but is only really required if you want to use binders and such. For the simple case of a predicate, you can usually get away with not doing that.
Evan Teran
2009-10-05 20:33:42
+13
A:
you should use find_first_of:
std::string m(".!?");
end = std::find_first_of(arToken.begin() + nStart, arToken.end(), m.begin(),m.end());
catwalk
2009-10-05 20:21:38