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Function object.require
Looks up key; if it exists returns corresponding value else evaluates value, adds it to the associative array and returns it.
ref V require(K, V)
(
ref V[K] aa,
K key,
lazy V value = V
);
Parameters
| Name | Description |
|---|---|
| aa | The associative array. |
| key | The key. |
| value | The required value. |
Returns
The value.
Authors
Walter Bright, Sean Kelly
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.