Re: union.sizeof

2017-03-26 Thread zabruk70 via Digitalmars-d-learn
On Sunday, 26 March 2017 at 07:18:14 UTC, ketmar wrote: i.e. what compiler does (roughly) is inserting anonymous fields of the appropriate size *into* the container. for "inner" aligning compiler inserts anonymous fields *between* other fields. for "outer" aligning compiler just appends anonymo

Re: union.sizeof

2017-03-26 Thread ketmar via Digitalmars-d-learn
zabruk70 wrote: On Sunday, 26 March 2017 at 06:45:13 UTC, ketmar wrote: yes. you have a typo in second `writefln`: S1 instead of S2. ;-) thank you. another question, related to my first post: why size of S2.b1 and S2.b2 still 3, not 4? am i right: then align applied to members, compiler not

Re: union.sizeof

2017-03-25 Thread zabruk70 via Digitalmars-d-learn
On Sunday, 26 March 2017 at 06:45:13 UTC, ketmar wrote: yes. you have a typo in second `writefln`: S1 instead of S2. ;-) thank you. another question, related to my first post: why size of S2.b1 and S2.b2 still 3, not 4? am i right: then align applied to members, compiler not change size of m

Re: union.sizeof

2017-03-25 Thread zabruk70 via Digitalmars-d-learn
On Sunday, 26 March 2017 at 06:38:59 UTC, zabruk70 wrote: oh sorry sorry - mistyping ok. DMD use padding, so for real container.sizeof i should use lastMemeber.offsetof+lastMemeber.sizeof

Re: union.sizeof

2017-03-25 Thread ketmar via Digitalmars-d-learn
zabruk70 wrote: On Sunday, 26 March 2017 at 05:09:15 UTC, ketmar wrote: most of the time either location or padding will work the same. hmm.. you ruined my expirence.. i made another experiment. whould you please explain me S2 size 6? thank you for you time. yes. you have a typo in second

Re: union.sizeof

2017-03-25 Thread zabruk70 via Digitalmars-d-learn
On Sunday, 26 March 2017 at 05:09:15 UTC, ketmar wrote: most of the time either location or padding will work the same. hmm.. you ruined my expirence.. i made another experiment. whould you please explain me S2 size 6? thank you for you time. https://dpaste.dzfl.pl/9a31b6e370a0 struct S1 //s

Re: union.sizeof

2017-03-25 Thread ketmar via Digitalmars-d-learn
zabruk70 wrote: Thank you ag0aep6g and ketmar!! I will use additional outside align. I want packing inside, you are right. But i check result size with assert() and failed. But for clearness... I was thinked, that align not changes SIZE, but changes LOCATION. I was thinked, that "align(X) unio

Re: union.sizeof

2017-03-25 Thread bauss via Digitalmars-d-learn
On Saturday, 25 March 2017 at 23:36:07 UTC, kinke wrote: On Saturday, 25 March 2017 at 22:45:22 UTC, ketmar wrote: zabruk70 wrote: [...] `align(1) union Union1` will do the trick. what you did is members packing. but the union itself is padded to integer size too. i.e. internal `align` wil

Re: union.sizeof

2017-03-25 Thread kinke via Digitalmars-d-learn
On Saturday, 25 March 2017 at 22:45:22 UTC, ketmar wrote: zabruk70 wrote: //DMD 2.073.1 and latest 2.075.0-master-972eaed //Windows 7 32-bit union Union1 { align(1): byte[5] bytes5; struct { align(1): char char1; uint int1; } } void main () { import std.stdio:

Re: union.sizeof

2017-03-25 Thread kinke via Digitalmars-d-learn
On Saturday, 25 March 2017 at 22:54:30 UTC, zabruk70 wrote: But for clearness... I was thinked, that align not changes SIZE, but changes LOCATION. I was thinked, that "align(X) union Union1" just force compiler to place Union1 on boundaries of X bytes... In order for all Union1 instances in a

Re: union.sizeof

2017-03-25 Thread zabruk70 via Digitalmars-d-learn
Thank you ag0aep6g and ketmar!! I will use additional outside align. I want packing inside, you are right. But i check result size with assert() and failed. But for clearness... I was thinked, that align not changes SIZE, but changes LOCATION. I was thinked, that "align(X) union Union1" just for

Re: union.sizeof

2017-03-25 Thread ketmar via Digitalmars-d-learn
zabruk70 wrote: //DMD 2.073.1 and latest 2.075.0-master-972eaed //Windows 7 32-bit union Union1 { align(1): byte[5] bytes5; struct { align(1): char char1; uint int1; } } void main () { import std.stdio: writefln; writefln("Union1.sizeof=%d", Union1.sizeof);

Re: union.sizeof

2017-03-25 Thread ag0aep6g via Digitalmars-d-learn
On 03/25/2017 11:37 PM, zabruk70 wrote: union Union1 { align(1): byte[5] bytes5; struct { align(1): char char1; uint int1; } } void main () { import std.stdio: writefln; writefln("Union1.sizeof=%d", Union1.sizeof); //prints 8, not 5 } I'm not sure how the align stuff

union.sizeof

2017-03-25 Thread zabruk70 via Digitalmars-d-learn
//DMD 2.073.1 and latest 2.075.0-master-972eaed //Windows 7 32-bit union Union1 { align(1): byte[5] bytes5; struct { align(1): char char1; uint int1; } } void main () { import std.stdio: writefln; writefln("Union1.sizeof=%d", Union1.sizeof); //prints 8, not 5 } I expe