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Update frequently-asked-questions.rst

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RJ 2016-03-30 12:08:48 -05:00
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docs/frequently-asked-questions.rst
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@ -666,21 +666,22 @@ gas and return your 20 Wei).
In the above example, the low-level function `call` is used to invoke another In the above example, the low-level function `call` is used to invoke another
contract with `p.data` as payload and `p.amount` Wei is sent with that call. contract with `p.data` as payload and `p.amount` Wei is sent with that call.
What happens to a mapping copied from a mapping of structs? What happens to a struct's mapping when copying over a struct?
=========================================================== ==============================================================
This is a very interesting question. Suppose that we have a contract field set up like such:: This is a very interesting question. Suppose that we have a contract field set up like such::
struct user{ struct user{
mapping(string => address) usedContracts; mapping(string => address) usedContracts;
} }
mapping(uint => user) userList;
function somefunction{ function somefunction{
user userA = userList[1]; user user1;
userList[2] = userA; user1.usedContracts["Hello"] = "World";
user user2 = user1;
} }
In this case, the mapping of the struct being copied over into the userList is ignored. In this case, the mapping of the struct being copied over into the userList is ignored as there is no "list of mapped keys".
Therefore it is not possible to find out which values should be copied over.
How do I initialize a contract with only a specific amount of wei? How do I initialize a contract with only a specific amount of wei?
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