[][src]Module libra_types::access_path

Suppose we have the following data structure in a smart contract:

struct B { Map<String, String> mymap; }

struct A { B b; int my_int; }

struct C { List mylist; }

A a; C c;

and the data belongs to Alice. Then an access to a.b.mymap would be translated to an access to an entry in key-value store whose key is <Alice>/a/b/mymap. In the same way, the access to c.mylist would need to query <Alice>/c/mylist.

So an account stores its data in a directory structure, for example: /balance: 10 /a/b/mymap: {"Bob" => "abcd", "Carol" => "efgh"} /a/myint: 20 /c/mylist: [3, 5, 7, 9]

If someone needs to query the map above and find out what value associated with "Bob" is, address will be set to Alice and path will be set to "/a/b/mymap/Bob".

On the other hand, if you want to query only /a/*, address will be set to Alice and path will be set to "/a" and use the get_prefix() method from statedb

Structs

AccessPath