智能合約開發實戰(九) - 錯誤處理函數(require、revert、assert)

Require

function deposit(int _amount) public {

//require(判斷式, 返回字串)

require(_amount > 0, "Deposited amount must be greater than zero");

}

Revert

int public balance;
function deposit(int _amount) public {
　　int oldBanance = 0;
　　if(balance < oldBanance) {
　　　　//revert(返回字串)
　　　　revert("Impossible!");
　　}
}

Assert

int public balance;
int public oldBanance = 0;
function deposit(int _amount) public {
　　//do something
　　//assert(判斷式)
　　assert(balance >= oldBanance);
}