mitchmindtree

// The example below gives the following:
//
// "error: cannot borrow `*self` as mutable more than once at a time"
//
// I understand why, but I am wondering if it is possible to define
// "setter" methods within the trait in a way similar to this?

#[deriving(Show)]
pub struct MyStruct<'a> { i: int, j: int }

mitchmindtree

// Is it considered bad practise to do something like this?
// Or is it fine? Common even?
//
// I'm specifically referring to impl'ing a trait method for a
// struct that returns a mutable reference to itself? In my
// current situation, it seems it will save a lot of unnecessary
// impl'ing when deriving from trait "A".

#[deriving(Show)]
pub struct MyStruct<'a> { i: int }

mitchmindtree

use tempo::Tempo;
use time_signature::TimeSignature;

#[deriving(Clone)]      // The error disappears if I remove this line.
#[deriving(Show)]
pub struct JTimePack<'r> {       
    sample_rate: int,            
    tempo: &'r Tempo,            
    time_sig: &'r TimeSignature,  // << Error is found here pointing to 't' in 'time_sig'
    ppqn: int                    

mitchmindtree

/*
I want a 'MyStruct' that can take any of the floating point primitive types.
When instantiating a 'MyStruct', I want to do so with MyStruct::new(val),
which should create a struct with val: val, but should also initialise
a: 0.0(f32/f64 - whatever it's floating point type is) and
b: 1.0(f32/f64 - whatever it's floating point type is).

Can I do this with a single impl method (like below)? Am I on the right
track, or is there a better way to handle this situation in Rust? (I'm
coming from c++).

mitchmindtree

//--------------- main.rs ---------------------
 
extern crate rand; // Why do I have to use this here, when I've already done so in a.rs?
 
mod a;
mod b;
 
fn main() {
  a::test();
  b::test();

mitchmindtree

mindTree:ofJenAI Mitch$ make
Compiling OF library for Release
make[2]: Nothing to be done for `ReleaseABI'.
Done!


Compiling ofJenAI for Release
find: demos: No such file or directory
find: demos: No such file or directory
find: demos: No such file or directory

mitchmindtree

mindTree:ofJenAI Mitch$ make
Compiling OF library for Release
make[2]: Nothing to be done for `ReleaseABI'.
Done!


Compiling ofJenAI for Release
find: demos: No such file or directory
find: demos: No such file or directory
Compiling src/main.cpp