cerc-io/solidity
16
0
Fork 0
mirror of https://github.com/ethereum/solidity synced 2023-10-03 13:03:40 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Update frequently-asked-questions.rst

Browse Source
This commit is contained in:
RJ 2016-03-30 12:08:48 -05:00
parent 0df5f40ac4
commit 9720851bd6
1 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
docs/frequently-asked-questions.rst
View File

@ -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?
==================================================================