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Explain about pointer types for mutually recursive structures.

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SVN=117463
This commit is contained in:
Rob Pike 2008-05-01 23:51:33 -07:00
parent 5e391cff2c
commit f5c0763432
1 changed files with 9 additions and 0 deletions
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doc/go_lang.txt
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@ -683,6 +683,15 @@ We do not allow pointer arithmetic of any kind.
*int *int
*map[string] *chan *map[string] *chan
It is legal to write a pointer type (only) such as *T or **T even if T
is not yet defined as a type name. This allows the construction of
mutually recursive data types such as structs:
type S1 struct { s2 *S2 } // S2 is not yet declared
type S2 struct { s1 *S1 }
By the end of the package source, such types must be fully declared.
There are no pointer literals. There are no pointer literals.