diff options
Diffstat (limited to 'docs/units-and-global-variables.rst')
| -rw-r--r-- | docs/units-and-global-variables.rst | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/docs/units-and-global-variables.rst b/docs/units-and-global-variables.rst index 7d21f065..64795306 100644 --- a/docs/units-and-global-variables.rst +++ b/docs/units-and-global-variables.rst @@ -35,7 +35,9 @@ These suffixes cannot be applied to variables. If you want to interpret some input variable in e.g. days, you can do it in the following way:: function f(uint start, uint daysAfter) { - if (now >= start + daysAfter * 1 days) { ... } + if (now >= start + daysAfter * 1 days) { + // ... + } } Special Variables and Functions @@ -70,6 +72,7 @@ Block and Transaction Properties ``msg.value`` can change for every **external** function call. This includes calls to library functions. +.. note:: If you want to implement access restrictions in library functions using ``msg.sender``, you have to manually supply the value of ``msg.sender`` as an argument. @@ -102,10 +105,10 @@ Mathematical and Cryptographic Functions compute ``(x * y) % k`` where the multiplication is performed with arbitrary precision and does not wrap around at ``2**256``. ``keccak256(...) returns (bytes32)``: compute the Ethereum-SHA-3 (Keccak-256) hash of the (tightly packed) arguments -``sha3(...) returns (bytes32)``: - alias to ``keccak256()`` ``sha256(...) returns (bytes32)``: compute the SHA-256 hash of the (tightly packed) arguments +``sha3(...) returns (bytes32)``: + alias to ``keccak256`` ``ripemd160(...) returns (bytes20)``: compute RIPEMD-160 hash of the (tightly packed) arguments ``ecrecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) returns (address)``: @@ -157,6 +160,9 @@ For more information, see the section on :ref:`address`. to make safe Ether transfers, always check the return value of ``send``, use ``transfer`` or even better: Use a pattern where the recipient withdraws the money. +.. note:: + The use of ``callcode`` is discouraged and will be removed in the future. + .. index:: this, selfdestruct Contract Related @@ -168,5 +174,8 @@ Contract Related ``selfdestruct(address recipient)``: destroy the current contract, sending its funds to the given :ref:`address` +``suicide(address recipient)``: + alias to ``selfdestruct`` + Furthermore, all functions of the current contract are callable directly including the current function. |