Source a single C function

source_function() is the most basic way to source a C function to the R side. It sources a single C function and exports it on the R side. There is no need to include the // [[ export() ]] tag when using source_function(), since only one function will be exported.

source_function(x, includes = NULL, no_remap = TRUE, show = FALSE)

Arguments

x	[character(1)] A block of code containing a single C function to compile.
includes	[NULL / character()] Extra includes to add manually. By default, R.h and Rinternals.h are included. Specify more includes with their file name. For example, to include #include <Rdefines.h> you just need to specify "Rdefines.h".
no_remap	[logical(1)] Should #define R_NO_REMAP be defined?
show	[logical(1)] Should the output of compiling the source code with R CMD SHLIB be shown?

Value

An R function that calls the compiled C code.

Examples

code <- "
  SEXP fn(SEXP x) {
    return x;
  }
"

fn <- source_function(code)

fn(1)
#> [1] 1