On Sunday, 4 June 2017 at 12:24:44 UTC, Suliman wrote:
// Will reuse the array, overwriting existing data.
// If other parts of the program are using existing data
// in the array, this will lead to hard-to-track-down bugs.
mytracks.length = 0;
mytracks.assumeSafeAppend();
Could you give an example where it can lead bugs? Do you mean
multi-thread apps?
it is not restricted to multithreads but is perhaps easiest to
think about it in those terms.
so you do
mytracks.length = 0;
mytracks.assumeSafeAppend();
and then you start building up the array again with some new data
so that the array is sorted (or some other property of the array)
and you do this over a period of time.
foreach(i; iota(N))
{
mytracks ~= MyTrack(i, "",0,0); // id is sorted
Fibre.yield(); // do something else, maybe wating for more
data
} func(mytracks); // precondition that arg is sorted.
meanwhile you have a reference to the `mytracks`buffer somewhere
else (another global variable for instance) and it is not
expecting to have its data 'stomped' and then it writes to it
then it will this may make `mytracks` no longer sorted.
