智能合约流动性挖矿开发详情（合约做市开发）丨DAPP流动性挖矿系统开发（节点做市开发
随着技术的不断进步，智能手机的普及情况加深，移动互联网的盈利模式不断扩大和成熟，可以想象未来的移动互联网市场前景更广阔，规模也会逐渐超越传统互联网。移动互联网引发的市场多元化，一方面让原有的市场变得更加垂直纵深，一方面是让大市场和小市场并存。当然传统互联网还是不可被取代，传统互联网如果能与移动互联网很好地融合，移动互联网带动传统互联网发展，将会是一个美好的愿景。
function div(uint256 a, uint256 b) internal constant returns (uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
function sub(uint256 a, uint256 b) internal constant returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal constant returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}开发流程及源码I59系统2OO7开发3O69
function toUINT112(uint256 a) internal constant returns(uint112) {
assert(uint112(a) == a);
return uint112(a);
}
function toUINT120(uint256 a) internal constant returns(uint120) {
assert(uint120(a) == a);
return uint120(a);
}
function toUINT128(uint256 a) internal constant returns(uint128) {
assert(uint128(a) == a);
return uint128(a);
}
}规则及案例：yy625019
// Abstract contract for the full ERC 20 Token standard
// https://github.com/ethereum/EIPs/issues/20
contract Token {
/* This is a slight change to the ERC20 base standard.
function totalSupply() constant returns (uint256 supply);
is replaced with:
uint256 public totalSupply;
This automatically creates a getter function for the totalSupply.
This is moved to the base contract since public getter functions are not
currently recognised as an implementation of the matching abstract
function by the compiler.
*/
/// total amount of tokens
//uint256 public totalSupply;
function totalSupply() constant returns (uint256 supply);
/// @param _owner The address from which the balance will be retrieved
/// @return The balance
function balanceOf(address _owner) constant returns (uint256 balance);
/// @notice send `_value` token to `_to` from `msg.sender`
/// @param _to The address of the recipient
/// @param _value The amount of token to be transferred
/// @return Whether the transfer was successful or not
function transfer(address _to, uint256 _value) returns (bool success);
/// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
/// @param _from The address of the sender
/// @param _to The address of the recipient
/// @param _value The amount of token to be transferred
/// @return Whether the transfer was successful or not
function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
/// @notice `msg.sender` approves `_addr` to spend `_value` tokens
/// @param _spender The address of the account able to transfer the tokens
/// @param _value The amount of wei to be approved for transfer
/// @return Whether the approval was successful or not
function approve(address _spender, uint256 _value) returns (bool success);
/// @param _owner The address of the account owning tokens
/// @param _spender The address of the account able to transfer the tokens
/// @return Amount of remaining tokens allowed to spent
function allowance(address _owner, address _spender) constant returns (uint256 remaining);
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
/// VEN token, ERC20 compliant
contract VEN is Token, Owned {
using SafeMath for uint256;
string public constant name = "VeChain Token"; //The Token's name
uint8 public constant decimals = 18; //Number of decimals of the smallest unit
string public constant symbol = "VEN"; //An identifier
// packed to 256bit to save gas usage.
struct Supplies {
// uint128's max value is about 3e38.
// it's enough to present amount of tokens
uint128 total;
uint128 rawTokens;
}
