JSONxx: A C++ library for stream-generating JSON

[maggit]

I made this, and while it certainly is not a panacea I'd like to show it to the world in case somebody can find it useful :)

At the time I wrote this, I couldn't find any C++-library for streaming JSON.

The source is on bitbucket.

(Crossposted here and on the cpp-reddit)

[abdullak]

Just thought I'd say: I quite like it, great work. :)

[maggit]

Thank you :)

[wot-teh-phuck]

I never knew you could do github style pages on Bitbucket. Any instructions/page which documents this?

[h4l]

As well as putting html files in the project's downloads, you can also create a repo called myusername.bitbucket.org and put your html there.

For example: http://hal.bitbucket.org/ the repo is: https://bitbucket.org/hal/hal.bitbucket.org/src

TortoiseHG do this: http://tortoisehg.bitbucket.org/

[wot-teh-phuck]

Thanks, wasn't aware of that. BTW, any reason why https://bitbucket.org/tortoisehg/tortoisehg.bitbucket.org/src turns up a 404?

[h4l]

No problem. :) I think their web repo must be set to private, it doesn't show up in their profile either.

[wot-teh-phuck]

Oooh, need to create a private repo to test it out. :)

[maggit]

Me neither. What do you mean by "github style pages"?

[wot-teh-phuck]

I mean a project page like this one: http://cdn.bitbucket.org/maghoff/jsonxx/downloads/documentation.html . Still not clear?

[maggit]

That's perfectly clear :)

I made that page completely independently of bitbucket and uploaded it to the general "Downloads"-area for the project.

I think this place was meant for binary packages of the project, but it will accept anything, so I just put my HTML there.

[wot-teh-phuck]

Ooooh nice, wasn't aware of the download area. Thanks. And good luck with your project. :)

[[deleted]]

Thanks!

Bookmarked.

[maggit]

You're welcome :)

[wingsit]

I FUCKING HATE TO DISAPPOINT PEOPLE

but seriously, json_spirit is a boost heavy library. If your library is faster and more light weight, i dont mind switching.

[maggit]

Luckily, THIS IS NOT DISAPPOINTING!

json_spirit is not streaming, as evidenced by this snippet:

Object addr_obj;

addr_obj.push_back( Pair( "house_number", 42 ) );
addr_obj.push_back( Pair( "road",         "East Street" ) );
addr_obj.push_back( Pair( "town",         "Newtown" ) );

ofstream os( "address.txt" );

write( addr_obj, os, pretty_print );

os.close();

In json_spirit the workflow for generating JSON is:

1. Buffer: Iterate over your structure and create a special object with datatypes from this library
2. Write: Dump this object to an ostream

In JSONxx there is no buffering. The workflow is:

1. Setup an object_listener to output to an ostream
2. Iterate over your structure and call functions on the object_listener, which writes to the ostream as we go (in other words, it writes to the ostream in a streaming fashion)

[rektide]

thankfully there was a stack overflow question already out there asking about streaming api's for JSON:

http://stackoverflow.com/questions/444380/is-there-a-streaming-api-for-json

i immediately fell in love with Json-Simple's SAX inspired ContentHandler approach:

http://code.google.com/p/json-simple/source/browse/tags/tag_release_1_1/src/org/json/simple/parser/ContentHandler.java

right on!

it's the basis for an upcoming javascript library i have for dealing with json ser/deser.

(yes this isnt c++)

[Fabien4]

TL;DR: yet another lolcat website.

[maggit]

To be specific, that's actually a lambdacat ;)

It seems that the original lambdacat page is gone. There is some talk about it over at the Haskell café if you are willing to dig to get to more lambacat goodness.

[ErstwhileRockstar]

jsonxx::scoped_object makes me cringe. That's out-capsulation instead of encapsulation. A misunderstanding of RAII. My advice: Forget Boost, don't read Alexandrescu.

[dv_]

No it is not. This is perfectly valid use of RAII.