_std/defines/ephemeral.dm 
| EPHEMERAL_HIDDEN | If used inside a type definition, defines an "ephemeral" subtype which overrides New() to remove itself without calling parents. A secondary EPHEMERAL_SHOWN define exists, which also defines an "ephemeral" subtype but one that doesn't override anything. Example use-case: An EPHEMERAL_XMAS define, which depending on whether it's christmas is #ifdef-ined at compile time to be either EPHEMERAL_SHOWN or EPHEMERAL_HIDDEN. Placing that EPHEMERAL_XMAS define in a type's definition will define an "ephemeral" subtype for it that will either do nothing or remove itself respectively. |
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| EPHEMERAL_SHOWN | Generates an "ephemeral" subtype which doesn't override anything. See EPHEMERAL_HIDDEN define's documentation for its purpose. |
Define Details
EPHEMERAL_HIDDEN
If used inside a type definition, defines an "ephemeral" subtype which overrides New() to remove itself without calling parents. A secondary EPHEMERAL_SHOWN define exists, which also defines an "ephemeral" subtype but one that doesn't override anything. Example use-case: An EPHEMERAL_XMAS define, which depending on whether it's christmas is #ifdef-ined at compile time to be either EPHEMERAL_SHOWN or EPHEMERAL_HIDDEN. Placing that EPHEMERAL_XMAS define in a type's definition will define an "ephemeral" subtype for it that will either do nothing or remove itself respectively.
EPHEMERAL_SHOWN
Generates an "ephemeral" subtype which doesn't override anything. See EPHEMERAL_HIDDEN define's documentation for its purpose.