how do you append arrays?

[Nicholas Wilson via Digitalmars-d-learn]

On Thursday, 25 February 2016 at 13:24:09 UTC, asdf wrote:
> On Thursday, 25 February 2016 at 13:06:10 UTC, cym13 wrote:
>>>
>>> In D the binary operator "~"  is used to concatenate both 
>>> strings (arrays of characters) and arrays. (also the ~= 
>>> operator is equivalent to lhs = lhs ~ rhs
>>>
>>> Nic
>>
>> Just a precision:  "lhs ~= rhs" isn't exactly equivalent to 
>> "lhs = lhs ~ rhs", those are two distinct operators that may 
>> deal with memory etc in different ways. For arrays doing "lhs 
>> = lhs ~ rhs" will first create (and allocate) the array 
>> corresponding  to "lhs ~ rhs" and then assign this new array 
>> to lhs. On the other hand "lhs ~= rhs" realises in-place 
>> append.
>
> I tried both, the error this time is:
> object.Exception@/data/data/com.termux/files/home/ldc/runtime/druntime/src/ldc/arrayinit.d(151): overlapping array copy

so you will have to make a copy and then move it

Im assuming
  history[1..100] = history[0..99];
this is the line causing your problem.
Note that D has zero based array indexing
so assuming your array has 100 elements history[1..100]
is going one past the end of the array.

also using a circular buffer here will solve this problem.

Nic