Re: [Boost-bugs] [Boost C++ Libraries] #4786: custom property_tree

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #4786: custom property_tree
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-03-20 15:52:17

#4786: custom property_tree
-------------------------------+--------------------------------------------
  Reporter:  anonymous         |       Owner:  cornedbee    
      Type:  Feature Requests  |      Status:  new          
 Milestone:  To Be Determined  |   Component:  property_tree
   Version:  Boost 1.44.0      |    Severity:  Problem      
Resolution:                    |    Keywords:  property_tree
-------------------------------+--------------------------------------------

Comment (by saleyn):

 Replying to [comment:3 anonymous]:
 > the idea looks nice. the C-style casts don't. the try/catch cascade with
 lexical_cast for guessing the type from string looks even more horrible,
 but there's nothing else to do since INFO files don't have any hints like
 "this property has that type" inside. it's too bad that the library
 maintainer didn't pay attention yet, maybe he could suggest something.

 Ideally the parsers would minimally give an ability to infer the type
 based on the parsed data, and provide a hint to the derived implementation
 so that the commonly identifiable inputs "1", "2.0", '"string"' are
 transformed into statically overridable calls that the transform function
 would be able to map into properly typed objects, e.g.:

 enum hint_t {UNDEFINED, INT, FLOAT, STRING};

 std::pair<std::basic_string<Ch>, hint_t> raw_data = read_data(text,
 &need_more_lines);
 typename Ptree::data_type typed_data = transform_data(raw_data);
 last.data() = typed_data;

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/4786#comment:6>
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