• Timothee Cour via Digitalmars-d-learn (5/5) Apr 07 2015 Eg, code like this in std.algorithm:
• Vladimir Panteleev (7/12) Apr 07 2015 It's historic. DMD 2.041 changed the type of array literals from
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (7/12) Apr 07 2015 It must be a leftover from the time when the type of an array literal

Timothee Cour via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:

Eg, code like this in std.algorithm:
assert(equal(setSymmetricDifference(a, b), [0, 5, 8, 9][]));
why not just:
assert(equal(setSymmetricDifference(a, b), [0, 5, 8, 9]));
?

"Vladimir Panteleev" <vladimir thecybershadow.net> writes:

On Wednesday, 8 April 2015 at 02:40:14 UTC, Timothee Cour wrote:
 Eg, code like this in std.algorithm:
 assert(equal(setSymmetricDifference(a, b), [0, 5, 8, 9][]));
 why not just:
 assert(equal(setSymmetricDifference(a, b), [0, 5, 8, 9]));
 ?

It's historic. DMD 2.041 changed the type of array literals from 
int[N] (i.e. fixed-length literals of static arrays) to int[] 
(dynamic arrays). Since [] means to take a slice of the entire 
static array, it would tell the compiler to create a static 
array, but only pass a slice of it to equal() instead of passing 
the entire static array by-value.

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 04/07/2015 07:40 PM, Timothee Cour via Digitalmars-d-learn wrote:
 Eg, code like this in std.algorithm:
 assert(equal(setSymmetricDifference(a, b), [0, 5, 8, 9][]));
 why not just:
 assert(equal(setSymmetricDifference(a, b), [0, 5, 8, 9]));
 ?

It must be a leftover from the time when the type of an array literal 
was a static array (versus a dynamic one). Since static arrays are not 
ranges, the author of the code apparently has first created a slice to 
its elements.

However, today array literals are already slices.

Ali