29 lines
1.0 KiB
Solidity
29 lines
1.0 KiB
Solidity
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// SPDX-License-Identifier: GPL-2.0-or-later
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pragma solidity >=0.5.0;
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/// @title Safe casting methods
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/// @notice Contains methods for safely casting between types
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library SafeCast {
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/// @notice Cast a uint256 to a uint160, revert on overflow
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/// @param y The uint256 to be downcasted
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/// @return z The downcasted integer, now type uint160
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function toUint160(uint256 y) internal pure returns (uint160 z) {
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require((z = uint160(y)) == y);
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}
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/// @notice Cast a int256 to a int128, revert on overflow or underflow
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/// @param y The int256 to be downcasted
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/// @return z The downcasted integer, now type int128
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function toInt128(int256 y) internal pure returns (int128 z) {
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require((z = int128(y)) == y);
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}
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/// @notice Cast a uint256 to a int256, revert on overflow
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/// @param y The uint256 to be casted
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/// @return z The casted integer, now type int256
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function toInt256(uint256 y) internal pure returns (int256 z) {
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require(y < 2**255);
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z = int256(y);
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}
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}
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