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| -rw-r--r-- | docs/types.rst | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/docs/types.rst b/docs/types.rst index 13e2a23e..187f62c1 100644 --- a/docs/types.rst +++ b/docs/types.rst @@ -291,6 +291,27 @@ So `bytes` should always be preferred over `byte[]` because it is cheaper. that you are accessing the low-level bytes of the utf-8 representation, and not the individual characters! +.. index:: ! array;allocating, new + +Allocating Memory Arrays +^^^^^^^^^^^^^^^^^^^^^^^^ + +Creating arrays with variable length in memory can be done using the `new` keyword. +As opposed to storage arrays, it is **not** possible to resize memory arrays by assigning to +the `.length` member. + +:: + + contract C { + function f(uint len) { + uint[] memory a = new uint[](7); + bytes memory b = new bytes(len); + // Here we have a.length == 7 and b.length == len + a[6] = 8; + } + } + + .. index:: ! array;length, length, push, !array;push Members |