Re: [chuck-users] making a duration into a string?

Sorry, yeah, the short answer is that there doesn't seem to be a good way to do what you're trying to do. If you want to see what Chuck does with "<<<" and ">>>", take a look at Chuck_Instr_Hack::execute( Chuck_VM * vm, Chuck_VM_Shred * shred ) in chuck_instr.cpp for the details. There really isn't much in the way of conversion, it just uses fprintf to print a double. andy On Sat, Jan 9, 2010 at 2:27 PM, Robert Poor wrote:

Andrew: Yep, I'd come up with the same thing: dedicated functions to convert times and durations into strings.  That works fine, but my question was actually simpler, and I apologize for not making it clear.  What I should have said:

"It's clear that there are internal functions for converting times and durations into strings, used in constructs such as:  <<< now, 1::second >>>; Are those internal functions available?"

... and I'm guessing the answer is simply "no".  Your suggested solution will do the job just fine (though I'd follow ChucK's lead and print everything in terms of samples).  Thanks!

- Rob

On Sat, Jan 9, 2010 at 14:11, Andrew Turley wrote:

...

So are you looking for something like this?

fun void log(string s) {  <<<s>>>; }

fun string stringify(dur d) {  return "" + ((d / (1::second))) + " seconds"; }

fun string stringify(time t) {  return "" + ((t / (1::second))) + " seconds"; }

1::second => dur d1; log("d1 is " + stringify(d1)); // "d1 is 1 seconds" 300::samp => dur d2; log("d2 is " + stringify(d2)); // "d2 is 0.0068 seconds"

now + 60::second => time t1; log("t1 is " + stringify(t1)); // "t1 is 60 seconds" now + 1::minute => time t2; log("t2 is " + stringify(t2)); // "t2 is 60 seconds"

Or are you trying to do something else?

Understand that times are represented as a delta of the number of samples since the VM (or maybe it's the shred) started executing. Again, the time itself doesn't carry any information about how it was created, so these two times would have the same representation if they were created at the same time:

now + 1::minute => time t1; now + 60::second => time t2;

And these two times have different representations since they are not created at the same time:

now + 1::minute => time t1; 5::second => now; now + 60::second => time t2;

andy

On Sat, Jan 9, 2010 at 1:16 PM, Robert Poor wrote:

...

Sure, can do, but this is only for debugging -- I'd welcome a means to get the same effect as  <<< "duration is", d >>>; which obviously works, but not as a string.  Same comments apply for stringifying a time value.

- Rob

On Sat, Jan 9, 2010 at 13:08, Andrew Turley wrote:

...

Are you looking for a way to generate something that would ultimately generate a string that contains "1::second"? Because if that's the case, you probably can't do it. Durations ultimately get stored as floats that represent the number of samples in the duration. And they don't, as far as I know, retain any information about the units that were used when they were created. So 6::second and 0.1::minute will both be stored as the number of samples that are contained in a 6 second interval.

Now, what you can do is convert the duration to a float by doing this:

1::second => dur d; d / (1::samp) => float dSamp;

And then you could convert that float to a string. Now what you probably want is a duration in terms of time rather than samples, so you could also get the number of samples per second and divide dSamp by that number, and then store your duration as a string representation of a floating point number represented in terms of seconds (or maybe you want milliseconds).

andy

On Sat, Jan 9, 2010 at 12:50 PM, Robert Poor wrote:

...

How can I cast a duration into a string (e.g. for passing as a string argument)?  Consider:

// ============= fun void log(string message) {  // do something to log the message }

1::second => dur d; log("the duration is " + d);  // fails with "cannot perform '+' on object references" log("the duration is " + d.toString()); // fails with "type 'dur' does not have members" // =============

Same question for time objects.

TIA.

- Rob _______________________________________________ chuck-users mailing list chuck-users@lists.cs.princeton.edu https://lists.cs.princeton.edu/mailman/listinfo/chuck-users

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