Solidity智能合約庫：區(qū)塊鏈工程師的隨身工具箱

pragma solidity ^0.4.25;import "./LibAddress.sol" contract Demo {    ...    address addr = 0xE0f5206BBD039e7b0592d8918820024e2a7437b9;    bytes memory bs = LibAddress.addressToBytes(addr);}

function f() public view {    uint256 a = 25;    uint256 b = 20;    // a + b    uint256 c = LibSafeMathForUint256Utils.add(a,b);    // a - b    uint256 d = LibSafeMathForUint256Utils.sub(a,b);    // a * b    uint256 e = LibSafeMathForUint256Utils.mul(a,b);    // a/b    uint256 f = LibSafeMathForUint256Utils.div(a,b);}

function f() public view {    uint256 a = 25;    uint256 b = 20;    // a % b    uint256 c = LibSafeMathForUint256Utils.mod(a,b);    // a ^ b    uint256 d = LibSafeMathForUint256Utils.power(a,b);}

function f() public view {    uint256 a = 25;    uint256 b = 20;    // max(a, b)    uint256 c= LibSafeMathForUint256Utils.max(a,b);    // min(a, b)    uint256 d = LibSafeMathForUint256Utils.min(a,b);    // average(a, b)    uint256 e = LibSafeMathForUint256Utils.average(a,b);}

function f() public view{    uint256 a = 25;    uint8 b = LibConverter.toUint8(a);}

function f() public view{    uint256 a = 25;    bytes memory b = LibConverter.uintToBytes(a);}

function f() public view{    bytes memory a = "25";    int b = LibConverter.bytesToInt(a);}

address addr = 0xE0f5206BBD039e7b0592d8918820024e2a7437b9;bytes memory bs = LibAddress.addressToBytes(addr);

bytes memory bs = newbytes(20);address addr = LibAddress.bytesToAddress(bs);

address addr = 0xE0f5206BBD039e7b0592d8918820024e2a7437b9;string memory addrStr = LibAddress.addressToString(addr);

string memory str="0xE0f5206BBD039e7b0592d8918820024e2a7437b9";address addr = LibAddress.stringToAddress(str);

uint[] private array;function f() public view {    array=new uint[](0);    // array add element 2    LibArrayForUint256Utils.addValue(array,2);    // array: {2}}

uint[] private array1;uint[] private array1;function f() public view {    array1=new uint[](2);    array2=new uint[](2);    LibArrayForUint256Utils.extend(array1,array2);    // array1 length 4}

uint[] private array;function f() public view {    array=new uint[](2);    array[0]=2;    array[1]=2;    LibArrayForUint256Utils.distinct(array);    // array: {2}}

uint[] private array;function f() public view {    array=new uint[](3);    array[0]=3;    array[1]=2;    array[2]=1;    LibArrayForUint256Utils.qsort(array);      // array: {1,2,3}}

uint[] private array;function f() public view {    array=new uint[](3);    array[0]=3;    array[1]=2;    array[2]=1;    uint256 key=3;    LibArrayForUint256Utils.binarySearch(array,key);      // array: {true, 1}}

uint[] private array;function f() public view {    array=new uint[](3);    array[0]=3;    array[1]=2;    array[2]=1;    LibArrayForUint256Utils.removeByValue(array,2);      // array: {3, 1}}

pragma solidity ^0.4.25;import "./LibString.sol";contract Test {    function f() public{        string memory str = "你好";        uint256 lenOfChars = LibString.lenOfChars(str);        uint256 lenOfBytes = LibString.lenOfBytes(str);        require(lenOfChars == 2);        require(lenOfBytes == 6);    }}

pragma solidity ^0.4.25;import "./LibString.sol";contract Test {    function f() public view returns(string memory)  {        string memory c = LibString.toUppercase("abcd");// Expected to be ABCD        return c;    }}

pragma solidity ^0.4.25;import "./LibString.sol";contract Test {    function f() public view {        bool r = LibString.equal("abcd","abcd");//Expected to be true        require(r);    }}

pragma solidity ^0.4.25;import "./LibString.sol";contract Test {    function f() public view {        bool r = LibString.startWith("abcd","ab");//Expected to be true        require(r);    }}

pragma solidity ^0.4.25;import "./LibBytesMap.sol";
contract Test {    using LibBytesMap for LibBytesMap.Map;    LibBytesMap.Map private map;    event Log(bytes key, uint256 index);    function f() public {        string memory k1 = "k1";        string memory k2 = "k2";        string memory k3 = "k3";        string memory v1 = "v1";        string memory v2 = "v2";        string memory v3 = "v3";        map.put(bytes(k1),bytes(v1));        map.put(bytes(k2),bytes(v2));        map.put(bytes(k3),bytes(v3));        // 開始迭代        uint256 i = map.iterate_start();        while(map.can_iterate(i)){            emit Log(map.getKeyByIndex(i), i);            i = map.iterate_next(i);        }    }}

pragma solidity ^0.4.25;
import "./LibAddressSet.sol";
contract Test {    using LibAddressSet for LibAddressSet.AddressSet;    LibAddressSet.AddressSet private addressSet;    event Log(uint256 size);    function testAddress() public {        //添加元素；        addressSet.add(address(1));        // {1}        // 查詢set容器數(shù)量        uint256 size = addressSet.getSize();        require(size == 1);        // 獲取指定index的元素        address addr = addressSet.get(0);        require(addr == address(1));        // 返回set中所有的元素        addressSet.getAll();        // {0x1}        // 判斷元素是否存在        bool contains = addressSet.contains(address(1));        require(contains== true);        // 刪除元素        addressSet.remove(address(1));    }}