Re: Converting Nim string to c void*

[jangko]

say you have a C function: 
    
    
    void store(void* data);
    

then you can using Nim ffi like this:
    
    
    proc store(data: pointer) {.importc, dynlib: "shared lib name".}
    

or pretend that the argument is a cstring
    
    
    proc store(data: cstring) {.importc, dynlib: "shared lib name".}
    

how to use the first one? 
    
    
    var mydata = "something"
    store(mydata[0].addr) #get the underlying char* address
    
    #or
    store(mydata.cstring) # implicit cast from char* to void*
    
    #or
    store(cast[pointer](mydata.cstring)) #unnecessary, but ok too
    

how to use the second one? 
    
    
    var mydata = "something"
    store(mydata) #use Nim's automatic conversion from string to cstring
    
    #or
    store(mydata.cstring) #unnecessary, but it's ok too.