$DCAP
/** *Submitted for verification at BscScan.com on 2021-12-17 */
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
/**
@dev Interface of the ERC20 standard as defined in the EIP. / interface IERC20 { /*
@dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256);
/**
@dev Returns the amount of tokens owned by
account
. */ function balanceOf(address account) external view returns (uint256);
/**
@dev Moves
amount
tokens from the caller's account torecipient
.Returns a boolean value indicating whether the operation succeeded.
Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool);
/**
@dev Returns the remaining number of tokens that
spender
will beallowed to spend on behalf of
owner
through {transferFrom}. This iszero by default.
This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256);
/**
@dev Sets
amount
as the allowance ofspender
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:
https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool);
/**
@dev Moves
amount
tokens fromsender
torecipient
using theallowance mechanism.
amount
is then deducted from the caller'sallowance.
Returns a boolean value indicating whether the operation succeeded.
Emits a {Transfer} event. */ function transferFrom( address sender, address recipient, uint256 amount ) external returns (bool);
/**
@dev Emitted when
value
tokens are moved from one account (from
) toanother (
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 anowner
is set bya call to {approve}.
value
is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
/**
@dev Interface for the optional metadata functions from the ERC20 standard.
Available since v4.1. / interface IERC20Metadata is IERC20 { /*
@dev Returns the name of the token. */ function name() external view returns (string memory);
/**
@dev Returns the symbol of the token. */ function symbol() external view returns (string memory);
/**
@dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
/*
@dev Provides information about the current execution context, including the
sender of the transaction and its data. While these are generally available
via msg.sender and msg.data, they should not be accessed in such a direct
manner, since when dealing with meta-transactions the account sending and
paying for execution may not be the actual sender (as far as an application
is concerned).
This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; }
function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
/**
@dev Implementation of the {IERC20} interface.
This implementation is agnostic to the way tokens are created. This means
that a supply mechanism has to be added in a derived contract using {_mint}.
For a generic mechanism see {ERC20PresetMinterPauser}.
TIP: For a detailed writeup see our guide
https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
to implement supply mechanisms].
We have followed general OpenZeppelin guidelines: functions revert instead
of returning
false
on failure. This behavior is nonetheless conventionaland does not conflict with the expectations of ERC20 applications.
Additionally, an {Approval} event is emitted on calls to {transferFrom}.
This allows applications to reconstruct the allowance for all accounts just
by listening to said events. Other implementations of the EIP may not emit
these events, as it isn't required by the specification.
Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
functions have been added to mitigate the well-known issues around setting
allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances;
mapping(address => mapping(address => uint256)) private _allowances;
uint256 private _totalSupply;
string private _name; string private _symbol;
/**
@dev Sets the values for {name} and {symbol}.
The default value of {decimals} is 18. To select a different value for
{decimals} you should overload it.
All two of these values are immutable: they can only be set once during
construction. */ constructor(string memory name_, string memory symbol_) { name = name; symbol = symbol; }
/**
@dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; }
/**
@dev Returns the symbol of the token, usually a shorter version of the
name. */ function symbol() public view virtual override returns (string memory) { return _symbol; }
/**
@dev Returns the number of decimals used to get its user representation.
For example, if
decimals
equals2
, a balance of505
tokens shouldbe displayed to a user as
5,05
(505 / 10 ** 2
).Tokens usually opt for a value of 18, imitating the relationship between
Ether and Wei. This is the value {ERC20} uses, unless this function is
overridden;
NOTE: This information is only used for display purposes: it in
no way affects any of the arithmetic of the contract, including
{IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; }
/**
@dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; }
/**
@dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; }
/**
@dev See {IERC20-transfer}.
Requirements:
recipient
cannot be the zero address.
the caller must have a balance of at least
amount
. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, amount); return true; }
/**
@dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; }
/**
@dev See {IERC20-approve}.
Requirements:
spender
cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), spender, amount); return true; }
/**
@dev See {IERC20-transferFrom}.
Emits an {Approval} event indicating the updated allowance. This is not
required by the EIP. See the note at the beginning of {ERC20}.
Requirements:
sender
andrecipient
cannot be the zero address.
sender
must have a balance of at leastamount
.
the caller must have allowance for
sender
's tokens of at least
amount
. */ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount);uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); unchecked { _approve(sender, _msgSender(), currentAllowance - amount); }
return true; }
/**
@dev Atomically increases the allowance granted to
spender
by the caller.This is an alternative to {approve} that can be used as a mitigation for
problems described in {IERC20-approve}.
Emits an {Approval} event indicating the updated allowance.
Requirements:
spender
cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue); return true; }
/**
@dev Atomically decreases the allowance granted to
spender
by the caller.This is an alternative to {approve} that can be used as a mitigation for
problems described in {IERC20-approve}.
Emits an {Approval} event indicating the updated allowance.
Requirements:
spender
cannot be the zero address.
spender
must have allowance for the caller of at least
subtractedValue
. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(_msgSender(), spender, currentAllowance - subtractedValue); }return true; }
/**
@dev Moves
amount
of tokens fromsender
torecipient
.This internal function is equivalent to {transfer}, and can be used to
e.g. implement automatic token fees, slashing mechanisms, etc.
Emits a {Transfer} event.
Requirements:
sender
cannot be the zero address.
recipient
cannot be the zero address.
sender
must have a balance of at leastamount
. */ function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(sender, recipient, amount);
uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[sender] = senderBalance - amount; } _balances[recipient] += amount;
emit Transfer(sender, recipient, amount);
_afterTokenTransfer(sender, recipient, amount); }
/** @dev Creates
amount
tokens and assigns them toaccount
, increasingthe total supply.
Emits a {Transfer} event with
from
set to the zero address.Requirements:
account
cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address");
_beforeTokenTransfer(address(0), account, amount);
_totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount);
_afterTokenTransfer(address(0), account, amount); }
/**
@dev Destroys
amount
tokens fromaccount
, reducing thetotal supply.
Emits a {Transfer} event with
to
set to the zero address.Requirements:
account
cannot be the zero address.
account
must have at leastamount
tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address");
_beforeTokenTransfer(account, address(0), amount);
uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount;
emit Transfer(account, address(0), amount);
_afterTokenTransfer(account, address(0), amount); }
/**
@dev Sets
amount
as the allowance ofspender
over theowner
s tokens.This internal function is equivalent to
approve
, and can be used toe.g. set automatic allowances for certain subsystems, etc.
Emits an {Approval} event.
Requirements:
owner
cannot be the zero address.
spender
cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address");
_allowances[owner][spender] = amount; emit Approval(owner, spender, amount); }
/**
@dev Hook that is called before any transfer of tokens. This includes
minting and burning.
Calling conditions:
when
from
andto
are both non-zero,amount
offrom
's tokens
will be transferred to
to
.when
from
is zero,amount
tokens will be minted forto
.
when
to
is zero,amount
offrom
's tokens will be burned.
from
andto
are never both zero.
To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {}
/**
@dev Hook that is called after any transfer of tokens. This includes
minting and burning.
Calling conditions:
when
from
andto
are both non-zero,amount
offrom
's tokens
has been transferred to
to
.when
from
is zero,amount
tokens have been minted forto
.
when
to
is zero,amount
offrom
's tokens have been burned.
from
andto
are never both zero.
To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
/**
@dev Contract module which provides a basic access control mechanism, where
there is an account (an owner) that can be granted exclusive access to
specific functions.
By default, the owner account will be the one that deploys the contract. This
can later be changed with {transferOwnership}.
This module is used through inheritance. It will make available the modifier
onlyOwner
, which can be applied to your functions to restrict their use tothe owner. */ abstract contract Ownable is Context { address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
@dev Initializes the contract setting the deployer as the initial owner. */ constructor() { }
/**
@dev Returns the address of the current owner. */ function owner() public view virtual returns (address) { return _owner; }
/**
@dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(owner() == _msgSender(), "Ownable: caller is not the owner"); _; }
/**
@dev Leaves the contract without owner. It will not be possible to call
onlyOwner
functions anymore. Can only be called by the current owner.NOTE: Renouncing ownership will leave the contract without an owner,
thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public virtual onlyOwner { _setOwner(address(0)); }
/**
@dev Transfers ownership of the contract to a new account (
newOwner
).Can only be called by the current owner. */ function transferOwnership(address newOwner) public virtual onlyOwner { require(newOwner != address(0), "Ownable: new owner is the zero address"); _setOwner(newOwner); }
function _setOwner(address newOwner) internal { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
/**
@dev Contract module which allows children to implement an emergency stop
mechanism that can be triggered by an authorized account.
This module is used through inheritance. It will make available the
modifiers
whenNotPaused
andwhenPaused
, which can be applied tothe functions of your contract. Note that they will not be pausable by
simply including this module, only once the modifiers are put in place. / abstract contract Pausable is Context { /*
@dev Emitted when the pause is triggered by
account
. */ event Paused(address account);
/**
@dev Emitted when the pause is lifted by
account
. */ event Unpaused(address account);
bool private _paused;
/**
@dev Initializes the contract in unpaused state. */ constructor() { _paused = false; }
/**
@dev Returns true if the contract is paused, and false otherwise. */ function paused() public view virtual returns (bool) { return _paused; }
/**
@dev Modifier to make a function callable only when the contract is not paused.
Requirements:
The contract must not be paused. */ modifier whenNotPaused() { require(!paused(), "Pausable: paused"); _; }
/**
@dev Modifier to make a function callable only when the contract is paused.
Requirements:
The contract must be paused. */ modifier whenPaused() { require(paused(), "Pausable: not paused"); _; }
/**
@dev Triggers stopped state.
Requirements:
The contract must not be paused. */ function _pause() internal virtual whenNotPaused { _paused = true; emit Paused(_msgSender()); }
/**
@dev Returns to normal state.
Requirements:
The contract must be paused. */ function _unpause() internal virtual whenPaused { _paused = false; emit Unpaused(_msgSender()); } }
interface IUniswapV2Pair { event Approval(address indexed owner, address indexed spender, uint value); event Transfer(address indexed from, address indexed to, uint value);
}
interface IUniswapV2Factory { event PairCreated(address indexed token0, address indexed token1, address pair, uint);
}
interface IUniswapV2Router01 { function factory() external pure returns (address); function WETH() external pure returns (address);
}
interface IUniswapV2Router02 is IUniswapV2Router01 { function removeLiquidityETHSupportingFeeOnTransferTokens( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline ) external returns (uint amountETH); function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens( address token, uint liquidity, uint amountTokenMin, uint amountETHMin, address to, uint deadline, bool approveMax, uint8 v, bytes32 r, bytes32 s ) external returns (uint amountETH);
}
contract CoinToken is ERC20, Ownable, Pausable {
}
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