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add comment about zero-copy in space chapter

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Paul Schaaf 2022-03-23 18:12:34 -04:00
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@ -1,6 +1,8 @@
# Space Reference # Space Reference
This reference tells you how much space you should allocate for an account. This reference tells you how much space you should allocate for an account.
This only applies to accounts that don't use `zero-copy`. `zero-copy` uses `repr(C)` with a pointer cast,
so there the `C` layout applies.
In addition to the space for the account data, you have to add `8` to the `space` constraint for Anchor's internal discriminator (see the example). In addition to the space for the account data, you have to add `8` to the `space` constraint for Anchor's internal discriminator (see the example).