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