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Protection to not lose money.

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chriseth 2019-08-28 17:00:15 +02:00 committed by GitHub
parent e74b63b6de
commit dc4a44fb7f
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1 changed files with 11 additions and 19 deletions
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30
docs/common-patterns.rst
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@ -41,15 +41,11 @@ become the new richest.
mostSent = msg.value;
}
function becomeRichest() public payable returns (bool) {
if (msg.value > mostSent) {
pendingWithdrawals[richest] += msg.value;
richest = msg.sender;
mostSent = msg.value;
return true;
} else {
return false;
}
function becomeRichest() public payable {
require(msg.value > mostSent, "Not enough money sent.");
pendingWithdrawals[richest] += msg.value;
richest = msg.sender;
mostSent = msg.value;
}
function withdraw() public {
@ -76,16 +72,12 @@ This is as opposed to the more intuitive sending pattern:
mostSent = msg.value;
}
function becomeRichest() public payable returns (bool) {
if (msg.value > mostSent) {
// This line can cause problems (explained below).
richest.transfer(msg.value);
richest = msg.sender;
mostSent = msg.value;
return true;
} else {
return false;
}
function becomeRichest() public payable {
require(msg.value > mostSent, "Not enough money sent.");
// This line can cause problems (explained below).
richest.transfer(msg.value);
richest = msg.sender;
mostSent = msg.value;
}
}