search for: magic_command

Hi Is there a command which will return the complete pathname of the file from which the current source is being read? I want something which can be inserted into any .r file and it will be able to ascertain exactly where it is, so that it can save data to the same directory, no matter where it is, regardless of what the current working directory is. Dave Richmond daver969 at mac.com

Thanks David! I am not clear on how to achieve this though. Could you give more info on this? I expect something like this: sort.cc file: bool Compare(void* a, void* b) { return false; } void SortFunc(void* arr, int len) { std::sort(arr, len, &Compare) } $MAGIC_COMMAND sort.cc -o a.llvm a.llvm is a bytecode which can be loaded at runtime in my JIT module and write some code to replace "Compare" function with our own "Compare" function. On Mon, Jul 8, 2019 at 1:17 PM David Blaikie <dblaikie at gmail.com> wrote: > That's an opt...

...s? >> >> I expect something like this: >> >> sort.cc file: >> >> bool Compare(void* a, void* b) { >> return false; >> } >> >> void SortFunc(void* arr, int len) { >> std::sort(arr, len, &Compare) >> } >> >> $MAGIC_COMMAND sort.cc -o a.llvm >> >> a.llvm is a bytecode which can be loaded at runtime in my JIT module and >> write some code to replace "Compare" function with our own "Compare" >> function. >> >> >> >> On Mon, Jul 8, 2019 at 1:17 PM David...

...e: >>>> >>>> bool Compare(void* a, void* b) { >>>> return false; >>>> } >>>> >>>> void SortFunc(void* arr, int len) { >>>> std::sort(arr, len, &Compare) >>>> } >>>> >>>> $MAGIC_COMMAND sort.cc -o a.llvm >>>> >>>> a.llvm is a bytecode which can be loaded at runtime in my JIT module >>>> and write some code to replace "Compare" function with our own "Compare" >>>> function. >>>> >>>> >&gt...

...; David Richmond wrote: > > Yes, source refers to the use of the source() function. Suppose I invoke > > a file like so: > > > > source("/path/name/filename.r") > > > > I want to insert a command in filename.r like so: > > > > fullpath <- magic_command() > > > > such that fullpath is now "/path/name/filename.r" > > > > How about > > source(fullpath<-"/path/name/filename.r") ? > That will work only when run at the top level. If it isn't sufficient to know the directory source("/...

Thanks David! I understand that std::sort doesn't exist without types especially at bytecode layer. What I was thinking was something like the following: Compile std::sort with a thunk function Compare(void*, void*) {rerturn false} into bytecode with an option say noinline and always make the function call or even a simple unoptimized bytecode which guarantees that Compare exists as a