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Update documentation.

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chriseth 2018-05-04 16:27:21 +02:00 committed by Alex Beregszaszi
parent 8ee5d3b274
commit 741ada79f9
1 changed files with 6 additions and 6 deletions
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docs/control-structures.rst
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@ -293,12 +293,7 @@ Solidity internally allows tuple types, i.e. a list of objects of potentially di
// Common trick to swap values -- does not work for non-value storage types. // Common trick to swap values -- does not work for non-value storage types.
(x, y) = (y, x); (x, y) = (y, x);
// Components can be left out (also for variable declarations). // Components can be left out (also for variable declarations).
// If the tuple ends in an empty component, (data.length,,) = f(); // Sets the length to 7
// the rest of the values are discarded.
(data.length,) = f(); // Sets the length to 7
// The same can be done on the left side.
// If the tuple begins in an empty component, the beginning values are discarded.
(,data[3]) = f(); // Sets data[3] to 2
// Components can only be left out at the left-hand-side of assignments, with // Components can only be left out at the left-hand-side of assignments, with
// one exception: // one exception:
(x,) = (1,); (x,) = (1,);
@ -307,6 +302,11 @@ Solidity internally allows tuple types, i.e. a list of objects of potentially di
} }
} }
.. note::
Prior to version 0.4.24 it was possible to assign to tuples of smaller size, either
filling up on the left or on the right side (which ever was empty). This is
now deprecated, both sides have to have the same number of components.
Complications for Arrays and Structs Complications for Arrays and Structs
------------------------------------ ------------------------------------