On Thursday, 25 February 2016 at 12:18:07 UTC, mahdi wrote:
On Thursday, 25 February 2016 at 11:50:02 UTC, sigod wrote:
On Thursday, 25 February 2016 at 10:03:08 UTC, mahdi wrote:
Thanks.
So when we define the function, we MUST specify the array
size to be able to accept a static array?
Can't we just define a function which can accept any static
array with any size? (e.g. a function to calculate average of
a static int array of any size)?
Static array can be accepted in place of dynamic:
void foo()
{
int[3] arr = [1, 2, 3];
bar(arr);
}
void bar(scope int[] arr)
{
import std.stdio : writeln;
writeln(arr); // [1, 2, 3]
}
But be careful not to escape such variables. Demonstration:
http://dpaste.dzfl.pl/613e04d4fe3f
My question: If in your `bar` function, the code tries to add a
new element to the dynamic array, it will be completely ok
because array is dynamic. BUT if we pass a static array to this
function, can this error be detected at compile time (and
prevent a runtime error)? If so, how?
I'm not sure if this is an error at all. Append sees that array
doesn't have any available space and allocates new array.
writeln(arr.ptr); // 7FBFC45AA0
arr ~= 1;
writeln(arr.ptr); // 4002E000
I would say that you have poor code design if your function must
be able to accept static arrays and append elements to it.
You might find this useful:
http://dlang.org/phobos/std_array.html#.Appender
