mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
37 lines
644 B
Solidity
37 lines
644 B
Solidity
// This tests a swap in storage which does not work as one
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// might expect because we do not have temporary storage.
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// (x, y) = (y, x) is the same as
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// y = x;
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// x = y;
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contract c {
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struct S {
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uint256 a;
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uint256 b;
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}
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S public x;
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S public y;
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function set() public {
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x.a = 1;
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x.b = 2;
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y.a = 3;
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y.b = 4;
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}
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function swap() public {
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(x, y) = (y, x);
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}
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}
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// ----
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// x() -> 0, 0
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// y() -> 0, 0
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// set() ->
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// gas irOptimized: 109684
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// gas legacy: 109728
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// gas legacyOptimized: 109680
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// x() -> 1, 2
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// y() -> 3, 4
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// swap() ->
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// x() -> 1, 2
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// y() -> 1, 2
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