52 lines
1.6 KiB
Solidity
52 lines
1.6 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity 0.8.7;
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/// @notice Basic ERC20 implementation.
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contract TestERC20 {
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string public name;
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string public symbol;
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uint8 public constant decimals = 18;
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uint256 public totalSupply;
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mapping(address => uint256) public balanceOf;
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mapping(address => mapping(address => uint256)) public allowance;
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event Transfer(address indexed from, address indexed to, uint256 amount);
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event Approval(address indexed owner, address indexed spender, uint256 amount);
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constructor(string memory _name, string memory _symbol, uint256 _totalSupply) {
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name = _name;
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symbol = _symbol;
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totalSupply = _totalSupply;
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balanceOf[msg.sender] = _totalSupply;
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emit Transfer(address(0), msg.sender, _totalSupply);
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}
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function approve(address to, uint256 amount) external returns (bool) {
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allowance[msg.sender][to] = amount;
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emit Approval(msg.sender, to, amount);
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return true;
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}
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function transfer(address to, uint256 amount) external returns (bool) {
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balanceOf[msg.sender] -= amount;
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balanceOf[to] += amount;
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emit Transfer(msg.sender, to, amount);
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return true;
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}
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function transferFrom(
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address from,
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address to,
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uint256 amount
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) external returns (bool) {
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if (allowance[from][msg.sender] != type(uint256).max)
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allowance[from][msg.sender] -= amount;
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balanceOf[from] -= amount;
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balanceOf[to] += amount;
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emit Transfer(from, to, amount);
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return true;
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}
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}
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