embark/dapps/tests/teller-contracts/contracts/token/SafeTransfer.sol

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pragma solidity ^0.5.7;
import "../token/ERC20Token.sol";
contract SafeTransfer {
function _safeTransfer(ERC20Token _token, address _to, uint256 _value) internal returns (bool result) {
_token.transfer(_to, _value);
assembly {
switch returndatasize()
case 0 {
result := not(0)
}
case 32 {
returndatacopy(0, 0, 32)
result := mload(0)
}
default {
revert(0, 0)
}
}
require(result, "Unsuccessful token transfer");
}
function _safeTransferFrom(
ERC20Token _token,
address _from,
address _to,
uint256 _value
) internal returns (bool result)
{
_token.transferFrom(_from, _to, _value);
assembly {
switch returndatasize()
case 0 {
result := not(0)
}
case 32 {
returndatacopy(0, 0, 32)
result := mload(0)
}
default {
revert(0, 0)
}
}
require(result, "Unsuccessful token transfer");
}
}