以太坊系列之十四: solidity特殊函数

 solidity中的特殊函数

括号里面有类型和名字的是参数,只有类型是返回值.

  • block.blockhash(uint blockNumber) returns (bytes32): hash of the given block - only
    works for 256 most recent blocks
  • block.coinbase (address): current block miner’s address
  • block.difficulty (uint): current block difficulty
  • block.gaslimit (uint): current block gaslimit
  • block.number (uint): current block number
  • block.timestamp (uint): current block timestamp
  • msg.data (bytes): complete calldata
  • msg.gas (uint): remaining gas
  • msg.sender (address): sender of the message (current call)
  • msg.value (uint): number of wei sent with the message
  • now (uint): current block timestamp (alias for block.timestamp)
  • tx.gasprice (uint): gas price of the transaction
    6.4. Solidity in Depth 99Solidity Documentation, 0.4.10
  • tx.origin (address): sender of the transaction (full call chain)
  • revert(): abort execution and revert state changes
  • keccak256(...) returns (bytes32): compute the Ethereum-SHA-3 (Keccak-256) hash of the
    (tightly packed) arguments
  • sha3(...) returns (bytes32): an alias to keccak256()
  • sha256(...) returns (bytes32): compute the SHA-256 hash of the (tightly packed) arguments
  • ripemd160(...) returns (bytes20): compute the RIPEMD-160 hash of the (tightly packed) arguments
  • ecrecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) returns (address):
    recover address associated with the public key from elliptic curve signature, return zero on error
  • addmod(uint x, uint y, uint k) returns (uint): compute (x + y) % k where the addition is performed with arbitrary precision and does not wrap around at 2**256
  • mulmod(uint x, uint y, uint k) returns (uint): compute (x * y) % k where the multiplication is performed with arbitrary precision and does not wrap around at 2**256
  • this (current contract’s type): the current contract, explicitly convertible to address
  • super: the contract one level higher in the inheritance hierarchy
  • selfdestruct(address recipient): destroy the current contract, sending its funds to the given address
  • .balance (uint256): balance of the Address in Wei
  • .send(uint256 amount) returns (bool): send given amount of Wei to Address, returns false on failure
  • .transfer(uint256 amount): send given amount of Wei to Address, throws on failure

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