• helxi (11/11) Mar 25 2017 What's the difference between
• rikki cattermole (11/22) Mar 25 2017 Hopefully the compiler is smart enough to ignore that slice (since its

helxi <brucewayneshit gmail.com> writes:

What's the difference between
1.
string x = "abcd";
     foreach(character; x)
         write(character);

and

string x = "abcd";
     foreach(character; x[0..$])
         write(character);

2. is and ==

3. pointer and address and reference?

rikki cattermole <rikki cattermole.co.nz> writes:

On 26/03/2017 7:52 AM, helxi wrote:
 What's the difference between
 1.
 string x = "abcd";
     foreach(character; x)
         write(character);

 and

 string x = "abcd";
     foreach(character; x[0..$])
         write(character);

Hopefully the compiler is smart enough to ignore that slice (since its 
identical in purpose).

 2. is and ==

is: bit for bit comparison
==: "magic" comparison logic, supports e.g. opEquals on classes.

 3. pointer and address and reference?

pointer: a place in memory! or hdd.. or well pretty much anywhere the 
kernel maps it to, just assume that there is some data there that you 
may be able to do some, all or none of these things read, write, 
execute. May also be invalid aka null aka 0.

reference: pointer + some other pointer generally, e.g. class instance 
data pointer + typeinfo reference + vtable.