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Merge pull request #5789 from ethereum/waq-multid-array

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[DOCS] Remove Multi-dimensional array FAQ
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chriseth 2019-01-14 14:12:10 +01:00 committed by GitHub
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docs/frequently-asked-questions.rst
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@ -94,23 +94,6 @@ The key point is that the calling contract needs to know about the function it i
See `ping.sol <https://github.com/fivedogit/solidity-baby-steps/blob/master/contracts/45_ping.sol>`_
and `pong.sol <https://github.com/fivedogit/solidity-baby-steps/blob/master/contracts/45_pong.sol>`_.
How do you create 2-dimensional arrays?
=======================================
See `2D_array.sol <https://github.com/fivedogit/solidity-baby-steps/blob/master/contracts/55_2D_array.sol>`_.
Note that filling a 10x10 square of ``uint8`` + contract creation took more than ``800,000``
gas at the time of this writing. 17x17 took ``2,000,000`` gas. With the limit at
3.14 million... well, there’s a pretty low ceiling for what you can create right
now.
Note that merely "creating" the array is free, the costs are in filling it.
Note2: Optimizing storage access can pull the gas costs down considerably, because
32 ``uint8`` values can be stored in a single slot. The problem is that these optimizations
currently do not work across loops and also have a problem with bounds checking.
You might get much better results in the future, though.
How do I initialize a contract with only a specific amount of wei?
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