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authorChris Chinchilla <chriswhward@gmail.com>2019-01-21 18:57:01 +0800
committerGitHub <noreply@github.com>2019-01-21 18:57:01 +0800
commitda73e253988788ee0733425174e99520b320a7fd (patch)
tree9a5201e1dd1457932119ba50ebc6e55f8da3f814 /docs/frequently-asked-questions.rst
parent606c2b99456c6be4cb1f563edee5286787b67490 (diff)
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Merge pull request #5797 from ethereum/faq-array-pass
[DOCS] Remove copy between contracts FAQ item
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@@ -96,36 +96,6 @@ In this example::
}
}
-Can a contract pass an array (static size) or string or ``bytes`` (dynamic size) to another contract?
-=====================================================================================================
-
-Sure. Take care that if you cross the memory / storage boundary,
-independent copies will be created::
-
- pragma solidity >=0.4.16 <0.6.0;
-
- contract C {
- uint[20] x;
-
- function f() public {
- g(x);
- h(x);
- }
-
- function g(uint[20] memory y) internal pure {
- y[2] = 3;
- }
-
- function h(uint[20] storage y) internal {
- y[3] = 4;
- }
- }
-
-The call to ``g(x)`` will not have an effect on ``x`` because it needs
-to create an independent copy of the storage value in memory.
-On the other hand, ``h(x)`` successfully modifies ``x`` because only
-a reference and not a copy is passed.
-
What does the following strange check do in the Custom Token contract?
======================================================================