https://eddelbuettel.r-universe.dev/RcppClassichttps://eddelbuettel.r-universe.dev/api/packages/RcppClassichttps://eddelbuettel.r-universe.dev/RcppClassic/RcppClassic.pdfhttps://eddelbuettel.r-universe.dev/RcppClassic/doc/manual.htmlhttps://eddelbuettel.r-universe.dev/RcppClassic/citationhttps://eddelbuettel.r-universe.dev/RcppClassic/citation.txthttps://eddelbuettel.r-universe.dev/RcppClassic/citation.cffhttps://eddelbuettel.r-universe.dev/RcppClassic/doc/RcppClassic-intro.pdf.asishttps://eddelbuettel.r-universe.dev/articles/RcppClassic/RcppClassic-intro.pdf