CODEWITHSUNDEEP
c++jsonboostboost-propertytree
user3842408
user3842408

Reputation: 89

boost ptree modify an array of values on the fly

I started using the ptree and the json parser from boost to save some quick information. The problem is that I only need to save some URI, so I don't care about a key. Now I want to find a certain value and remove it. How can I do this

{
    "MyArray":
     [
              "value1",
              "value2"
     ]
}

I can't use find() and iterators don't seem to work.

for (it ; it != myptree.end();  ++it)
    if ((*it).second.data.compare(strValueImSearching) != 0)
    // the previous line is not valid from .data
         myptree.erase(it);

Upvotes: 3

Views: 987

Answers (1)

sehe
sehe

Reputation: 393174

Ah. Lightbulb moment.

You cannot iterate a collection that's changing like that, because the erase calls invalidate the current iterator.

See here for iterator invalidation rules: Iterator invalidation rules

Instead, indeed use stable iterators:

while (it != myptree.end()) {
     if ((*it).second.data.compare(strValueImSearching) != 0)
         it = myptree.erase(it);
     else
         ++it;
}

Upvotes: 1

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