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Splitting a string in C++
I need a function of split.
has to work like this:
buffer = split(str, ' ');
I searchead a split functions, tryed boost libs, and all works bad :/
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3Now that's a sorry thing. What can we help you with? – Sep 16 '12 at 10:28
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1http://stackoverflow.com/questions/236129/splitting-a-string-in-c – nhahtdh Sep 16 '12 at 10:28
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2Could you please post what you have tried? – Martin James Sep 16 '12 at 10:29
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What type is buffer? Do you want it from a string to an array? To vector? What? – Martol1ni Sep 16 '12 at 10:29
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http://stackoverflow.com/questions/236129/splitting-a-string-in-c See @EvanTeran's solution – nullpotent Sep 16 '12 at 10:30
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@H2CO3 Cant you see? This guy need a split function that works well! Lets go find it! – TeaOverflow Sep 16 '12 at 10:31
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buffer is vector, str is string – ernilos Sep 16 '12 at 10:31
3 Answers
1
strtok() from standard c library is pretty good and does what you are looking for. Unless you are keen on using it from multiple threads and worried about function not being re entrant which i don't suspect is the case here.
P.S. Above assumes you have a character array as input. If it was a c++ string, still you can use string.c_str to get the c string before using strtok
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1
The boost lib is supposed to work as well.
Use it like so:
vector <string> buffer;
boost::split(buffer, str_to_split, boost::is_any_of(" "));
Added:
Make sure to include the algorithm:
#include <boost/algorithm/string.hpp>
Print it to the std::cout like so:
vector<string>::size_type sz = buffer.size();
cout << "buffer contains:";
for (unsigned i=0; i<sz; i++)
cout << ' ' << buffer[i];
cout << '\n';
-1
I guess strtok() is what you're looking for.
It allows you to always return the first sub string delimited by given character(s):
char *string = "Hello World!";
char *part = strtok(string, " "); // passing a string starts a new iteration
while (part) {
// do something with part
part = strtok(NULL, " "); // passing NULL continues with the last string
}
Note that this version must not be used in several threads at once (there's also a version (strtok_s(), more details here) which has an additional parameter to make it work in a parallelized environment). This is also true for cases where you'd like to split a substring within a loop.
