根据您提供的具体代码链接，在 OpenZeppelin Contracts 的这个提交版本中：
_transfer 函数确实是 internal virtual 的
代码位置：
具体代码：
function _transfer(
address from,
address to,
uint256 amount
) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
// Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
// decrementing then incrementing.
_balances[to] += amount;
}
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, amount);
}
关键点：
- ✅
internal virtual- 可以被继承合约重写 - ✅ 包含前后钩子 -
_beforeTokenTransfer和_afterTokenTransfer - ✅ 安全检查 - 零地址检查和余额检查
- ✅ 使用 unchecked - 优化 Gas 消耗
这使得开发者可以通过继承来定制转账逻辑，同时保持核心安全功能。
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