mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
24 lines
648 B
Solidity
24 lines
648 B
Solidity
type U8 is uint8;
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using {add as +} for U8 global;
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function add(U8 x, U8 y) pure returns (U8) {
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return U8.wrap(U8.unwrap(x) + U8.unwrap(y)); // FIXME: should detect possible overflow here
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}
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contract C {
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U8 x = U8.wrap(254);
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function inc() public {
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x = x + U8.wrap(1); // FIXME: should detect possible overflow here
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}
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function check() view public {
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U8 y = x;
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assert(U8.unwrap(y) < 256);
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}
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}
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// ====
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// SMTEngine: all
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// ----
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// Warning 6756: (274-288): User-defined operators are not yet supported by SMTChecker. This invocation of operator + has been ignored, which may lead to incorrect results.
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