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some attempts for structure packing under GNU C++

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This commit is contained in:
Jiri Pittner 2021-08-28 17:05:54 +02:00
parent 84cc6b4d35
commit 5667fae364
1 changed files with 19 additions and 5 deletions
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24
fourindex.h
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@ -74,15 +74,28 @@ return (i/hcd0(i,j)*j);
//when patient enough, make const_casts for piterators to have pbegin() const //when patient enough, make const_casts for piterators to have pbegin() const
template<class I> template<class I>
union packed_index { struct indiv_index {
I packed[4];
struct {
I i; I i;
I j; I j;
I k; I k;
I l; I l;
} indiv; }
}; #ifdef __GNUC__
__attribute__((packed))
#endif
;
template<class I>
union packed_index {
I packed[4];
struct indiv_index<I> indiv;
}
#ifdef __GNUC__
__attribute__((packed))
#endif
;
template<class I, class T> template<class I, class T>
struct matel4 struct matel4
@ -91,6 +104,7 @@ struct matel4
matel4 *next; matel4 *next;
union packed_index<I> index; union packed_index<I> index;
}; };
//should not be packed
template<class I, class T> template<class I, class T>