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authorRJ <catalanor0220@gmail.com>2016-03-31 01:08:48 +0800
committerRJ <catalanor0220@gmail.com>2016-03-31 01:08:48 +0800
commit9720851bd6b3f03e0c822becc8cd4657f9aeb63e (patch)
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parent0df5f40ac41220aae8a9d082ebd45fb17b8b821b (diff)
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Update frequently-asked-questions.rst
-rw-r--r--docs/frequently-asked-questions.rst13
1 files changed, 7 insertions, 6 deletions
diff --git a/docs/frequently-asked-questions.rst b/docs/frequently-asked-questions.rst
index b1ca04ff..fc7d7b7f 100644
--- a/docs/frequently-asked-questions.rst
+++ b/docs/frequently-asked-questions.rst
@@ -666,21 +666,22 @@ gas and return your 20 Wei).
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.
-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::
struct user{
mapping(string => address) usedContracts;
}
- mapping(uint => user) userList;
function somefunction{
- user userA = userList[1];
- userList[2] = userA;
+ user user1;
+ 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?
==================================================================