[Boost-users] erase and put methods in property tree lib of boost

Subject: [Boost-users] erase and put methods in property tree lib of boost
From: Sashidhar Guntury (sashidhar.moony_at_[hidden])
Date: 2013-03-21 12:45:13

I have been trying to use the put and erase methods in boost's property
tree library with very limited success. I have tried to go through the
documentation but it seems really esoteric with no real example to
demonstrate. This is what I would like to do -

I have a json object. I look for a particular key (call it "title") and
extract the corresponding value (call it "Eric Clapton"), do something with
"Eric Clapton" (say change it to "ec") insert it in the place of the old
value. Now, should I do an "erase" to remove the previous entry and then
"put" the new pair? Will "put" replace the old value?

    void doSomething(const ptree& node)
    {
        ...
        BOOST_FOREACH(const ptree::value_type& child,
node.get_child("artists"))
        {
            string text = child.second.get<string>("title");
            // do something to the text to give text2
            child.second.put("title", text2);
        }
        ...
    }

The above code gives an error which is equally hard to understand. I was
hoping someone would shed some light.

thanks
Sashidhar