Appenders and Arrays

[Daniel Kozak via Digitalmars-d-learn]

Dne 1.9.2015 v 19:20 Steven Schveighoffer via Digitalmars-d-learn napsal(a):
> On 9/1/15 12:49 PM, default0 wrote:
>> Hello
>>
>> A simple thing I stumbled across:
>>
>> int main()
>> {
>>      import std.stdio;
>>      import std.range;
>>
>>      int[] d;
>>      d ~= 10;
>>      d ~= 20;
>>      d.put(5);
>>      writeln(d);
>>
>>      return 0;
>> }
>>
>> Appenders work fine as output ranges, but arrays do not. The above code
>> prints "20" (ie the 10 is removed). Is "put" not supposed to mean
>> "append one element"?
>
> put into an slice does not append, it fills in the front. This is 
> because the "target" of a slice is the data it points at.
>
> Think of it as a buffer that you want to fill:
>
> int[20] buf;
> int[] outputRange = buf[];
> outputRange.put(10);
> outputRange.put(20);
>
> assert(buf[0..2] == [10,20]);
So it is something like this?:

int main()
{
     import std.stdio;
     import std.range;

     int[] d;
     d ~= [10];
     d ~= [20];
     d.front = 5;
     d.popFront();
     writeln(d);

     return 0;
}