• Martin (12/12) Feb 17 2021 Hi,
• Adam D. Ruppe (5/6) Feb 17 2021 == compares contents. Both null and "" have empty contents and
• Steven Schveighoffer (4/12) Feb 18 2021 assert (and if, and using boolean operators) looks at the pointer and

Martin <martin.brzenska googlemail.com> writes:

Hi,

is this how it supposed to be? (https://run.dlang.io/is/7B4irm)
---
string a = null;
string t = "";

assert( ! a );
assert( t );
assert( t == a );
---

I have not expected assert(t == a) to be true - i would like to 
know the argument for why this is correct when at the same time 
assert(!a) and assert(t) is true.. feels a litle bit js-ish to me

Adam D. Ruppe <destructionator gmail.com> writes:

On Wednesday, 17 February 2021 at 20:48:22 UTC, Martin wrote:
 is this how it supposed to be? (https://run.dlang.io/is/7B4irm)

== compares contents. Both null and "" have empty contents and 
are interchangable for operators that work on contents.

The assert just looks at the pointer, not contents. The `is` 
operator also looks at pointer (and length).

Steven Schveighoffer <schveiguy gmail.com> writes:

On 2/17/21 4:16 PM, Adam D. Ruppe wrote:
 On Wednesday, 17 February 2021 at 20:48:22 UTC, Martin wrote:
 is this how it supposed to be? (https://run.dlang.io/is/7B4irm)

 
 == compares contents. Both null and "" have empty contents and are 
 interchangable for operators that work on contents.
 
 The assert just looks at the pointer, not contents. The `is` operator 
 also looks at pointer (and length).

assert (and if, and using boolean operators) looks at the pointer and 
length, the same as `is`.

-Steve