(PECL ds >= 1.0.0)
Ds\Stack::allocate — Allocates enough memory for a required capacity
$capacity): voidEnsures that enough memory is allocated for a required capacity. This removes the need to reallocate the internal as values are added.
capacityThe number of values for which capacity should be allocated.
注意:
Capacity will stay the same if this value is less than or equal to the current capacity.
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