Dereference a pointer

Reads the pointer value stored at an address. This is useful for accessing global variables in shared libraries that are pointers (like R_GlobalEnv, R_NilValue, etc.).

Usage

ffi_deref_pointer(ptr)

Arguments

ptr

External pointer to the address to dereference

Value

External pointer containing the value at the address

Examples

if (FALSE) { # \dontrun{
# Get R_GlobalEnv from libR.so
addr <- getNativeSymbolInfo("R_GlobalEnv")$address
globalenv_sexp <- ffi_deref_pointer(addr)
} # }