[Rcpp-devel] Manipulating json with Rcpp

[Dirk Eddelbuettel]

On 11 October 2018 at 13:43, Neal Fultz wrote:
| (Resending to list, sorry)
| 
| | I was pleasantly surprised how easy it was to make a header-only package
| > | (by cannabalizing BH and copying the hpp file to inst/include).
| >
| > Why?  Is LinkingTo: BH not good enough?
| >
| 
| I'm not using Boost for json, instead using this
| https://nlohmann.github.io/json/ for the
| syntax sugar.

Ok, clearer now what you meant. And yes -- a good header-only JSON solution.
 
| But I wanted to start with something that was working instead of starting
| from scratch, in case
| there were package configuration that had to be set to make //
| [[Rcpp::depends(RcppJson)]]
| compile correctly. But Rcpp::depends seems to find everything
| automatically, it "just works".

Are you mostly using sourceCpp() ?  Else use the package you created, and
have other package use LinkingTo: to it.
 
| > | Maybe someone else will find this useful some day.
| >
| > There are also R (at least) cpp-using package ndjson and validatejsonr on
| > CRAN.

Fair points. I was extrapolating because the last one I heard about what the
JSON modifier (not on CRAN yet) which works at the C++ level:

   https://github.com/SymbolixAU/jsonify
 
| Those are good finds. Not sure if you can use them from inside C++ though.
| 
| It looks like Bob Rudis is also using the nlohmann/json.h, maybe I can ask
| him to
| move json.h from src/ to inst/include for his next release. I think that's
| all that needed
| to make Rcpp::depends / LinkingTo work.

Yep!

Dirk

 
| On Thu, Oct 11, 2018 at 12:18 PM Dirk Eddelbuettel <edd at debian.org> wrote:
| 
| >
| > On 11 October 2018 at 11:50, Neal Fultz wrote:
| > | I recently needed to deal with json on the C++ side of things, and found
| > | the nlohmann json library.
| > |
| > | I made a small wrapper package: https://github.com/nfultz/RcppJson
| >
| > Cool.
| >
| > | I was pleasantly surprised how easy it was to make a header-only package
| > | (by cannabalizing BH and copying the hpp file to inst/include).
| >
| > Why?  Is LinkingTo: BH not good enough?
| > |
| > | Maybe someone else will find this useful some day.
| >
| > There are also R (at least) cpp-using package ndjson and validatejsonr on
| > CRAN.
| >
| > Dirk
| >
| > --
| > http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
| >
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