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digitalmars.D.learn - struct .sizeof

reply Funog <funog ifrance.com> writes:
Hi,
I usually program in java, so i'm not used to memory management.
For exemple, i do not understand why the following struct

struct Foo
{
  long a;
  byte b;
}

has a .sizeof of 16 ? couldn't it fit in 9 bytes ?
Thanks.
Aug 28 2006
parent reply Tom S <h3r3tic remove.mat.uni.torun.pl> writes:
Funog wrote:

 Hi,
 I usually program in java, so i'm not used to memory management.
 For exemple, i do not understand why the following struct
 
 struct Foo
 {
   long a;
   byte b;
 }
 
 has a .sizeof of 16 ? couldn't it fit in 9 bytes ?
 Thanks.


Sure it could:

align (1) struct Foo
{
   long a;
   byte b;
}

static assert (Foo.sizeof == 9);
Aug 28 2006
parent Frank Benoit <keinfarbton nospam.xyz> writes:
 has a .sizeof of 16 ? couldn't it fit in 9 bytes ?
 Thanks.


 
 Sure it could:
 
 align (1) struct Foo
 {
   long a;
   byte b;
 }
 
 static assert (Foo.sizeof == 9);


Some more background info:
http://en.wikipedia.org/wiki/Data_structure_alignment
Aug 28 2006