2

curious why the require statement throws up Undeclared identifier in this solidity code:

pragma solidity ^0.4.8;

contract Escrow {
    ....
    modifier onlyafter(uint _time) {
      require(now >= _time);
      _;
}

I rewrote it as:

   modifier onlyafter(uint _time) {
      if(now >= _time){
       throw;}
      _;
}

which compiled fine.

5

require is available since Solidity 0.4.10: https://github.com/ethereum/solidity/releases

Since your pragma requires an older Solidity version this leads to a compiler error.

| improve this answer | |
  • Thanks. Yes I tried to bump up the version in truffle but it was having none of it. Not a biggie but nice to know. – codervince Jun 16 '17 at 10:14
  • truffle sometimes lags a few compiler versions behind. I see that the currently latest version of truffle should ship with Solidity 0.4.11 so you should be fine if you update your pragma statement accordingly: github.com/trufflesuite/truffle/releases/tag/v3.2.2 – SCBuergel.eth Jun 17 '17 at 17:26

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