In place tokenizing of a std::string

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How do I tokenize a string in C++?

There are several possibilites to tokenize a std::string like strtok does it with C style strings. I found boost::tokenizer, getline, or a manual iteration through the string. But each of these possibilities differ from strtok because they all are not in place. They copy the characters to new strings (please correct me if one of my given possibility actually works different) while strtok doesn't need to allocate (at least from my view - internally it could possibly allocate memory) any memory.

Now I'm just curious if there is any way of realizing this behaviour for a std::string? I thought about accessing via data but it returns a const pointer.

Any ideas?

Already answered : http://stackoverflow.com/questions/53849/how-do-i-tokenize-a-string-in-c — Ram, Sep 20 '12 at 11:32
Today I found the time to try the possibilities given in the other question. As I already thought most of them didn't work in place. Only the C style strtok doesn't use any unnecessary allocations. — user1678062, Sep 22 '12 at 20:34

score 1 · Accepted Answer · answered Sep 20 '12 at 11:30

1

You can tokenize a std::string in-place simply by yielding the tokes as pairs of std::string iterators.

answered Sep 20 '12 at 11:30

Frerich Raabe

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Is there a way of representing a pair of string iterators as if they were real strings? – user1678062 Sep 22 '12 at 20:35
@user1678062: If you can live with creating a temporary copy of the string, then you could just use the `std::string` constructor taking two iterators. – Frerich Raabe Sep 23 '12 at 07:04
Well, then I have to live with it or write my own string class. Nevertheless thanks for your answer! – user1678062 Sep 23 '12 at 09:07

In place tokenizing of a std::string

1 Answers1