Cryptocurrency Whitepapers

Leonicorn Swap ( LEON )
// SPDX-License-Identifier: UNLISCENSED pragma solidity 0.8.4; /** * @title SampleBEP20Token * @dev Very simple BEP20 Token example, where all tokens are pre-assigned to the creator. * Note they can later distribute these tokens as they wish using `transfer` and other * `BEP20` functions. * USE IT ONLY FOR LEARNING PURPOSES. SHOULD BE MODIFIED FOR PRODUCTION */ contract SampleBEP20Token { string public name = "ORAL JUICE"; string public symbol = "ORAL"; uint256 public totalSupply = 1000000000000000000000000000; // 1000 million tokens uint8 public decimals = 18; /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed _from, address indexed _to, uint256 _value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval( address indexed _owner, address indexed _spender, uint256 _value ); mapping(address => uint256) public balanceOf; mapping(address => mapping(address => uint256)) public allowance; /** * @dev Constructor that gives msg.sender all of existing tokens. */ constructor() { balanceOf[msg.sender] = totalSupply; } /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address _to, uint256 _value) public returns (bool success) { require(balanceOf[msg.sender] >= _value); balanceOf[msg.sender] -= _value; balanceOf[_to] += _value; emit Transfer(msg.sender, _to, _value); return true; } /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * * * Emits an {Approval} event. */ function approve(address _spender, uint256 _value) public returns (bool success) { allowance[msg.sender][_spender] = _value; emit Approval(msg.sender, _spender, _value); return true; } /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address _from, address _to, uint256 _value ) public returns (bool success) { require(_value <= balanceOf[_from]); require(_value <= allowance[_from][msg.sender]); balanceOf[_from] -= _value; balanceOf[_to] += _value; allowance[_from][msg.sender] -= _value; emit Transfer(_from, _to, _value); return true; } }
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