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[quickjs-emscripten](../README.md) / [Exports](../modules.md) / WeakLifetime
# Class: WeakLifetime<T, TCopy, Owner\>
A Lifetime that does not own its `value`. A WeakLifetime never calls its
`disposer` function, but can be `dup`ed to produce regular lifetimes that
do.
Used for function arguments.
## Type parameters
| Name | Type |
| :------ | :------ |
| `T` | `T` |
| `TCopy` | `never` |
| `Owner` | `never` |
## Hierarchy
- [`Lifetime`](Lifetime.md)<`T`, `TCopy`, `Owner`\>
↳ **`WeakLifetime`**
## Table of contents
### Constructors
- [constructor](WeakLifetime.md#constructor)
### Properties
- [\_alive](WeakLifetime.md#_alive)
- [\_constructorStack](WeakLifetime.md#_constructorstack)
- [\_owner](WeakLifetime.md#_owner)
- [\_value](WeakLifetime.md#_value)
- [copier](WeakLifetime.md#copier)
- [disposer](WeakLifetime.md#disposer)
### Accessors
- [alive](WeakLifetime.md#alive)
- [dupable](WeakLifetime.md#dupable)
- [owner](WeakLifetime.md#owner)
- [value](WeakLifetime.md#value)
### Methods
- [consume](WeakLifetime.md#consume)
- [dispose](WeakLifetime.md#dispose)
- [dup](WeakLifetime.md#dup)
## Constructors
### constructor
• **new WeakLifetime**<`T`, `TCopy`, `Owner`\>(`value`, `copier?`, `disposer?`, `owner?`)
When the Lifetime is disposed, it will call `disposer(_value)`. Use the
disposer function to implement whatever cleanup needs to happen at the end
of `value`'s lifetime.
`_owner` is not used or controlled by the lifetime. It's just metadata for
the creator.
#### Type parameters
| Name | Type |
| :------ | :------ |
| `T` | `T` |
| `TCopy` | `never` |
| `Owner` | `never` |
#### Parameters
| Name | Type |
| :------ | :------ |
| `value` | `T` |
| `copier?` | (`value`: `T` \| `TCopy`) => `TCopy` |
| `disposer?` | (`value`: `TCopy`) => `void` |
| `owner?` | `Owner` |
#### Overrides
[Lifetime](Lifetime.md).[constructor](Lifetime.md#constructor)
#### Defined in
[ts/lifetime.ts:156](https://github.com/justjake/quickjs-emscripten/blob/main/ts/lifetime.ts#L156)
## Properties
### \_alive
• `Protected` **\_alive**: `boolean` = `true`
#### Inherited from
[Lifetime](Lifetime.md).[_alive](Lifetime.md#_alive)
#### Defined in
[ts/lifetime.ts:31](https://github.com/justjake/quickjs-emscripten/blob/main/ts/lifetime.ts#L31)
___
### \_constructorStack
• `Protected` **\_constructorStack**: `undefined` \| `string`
#### Inherited from
[Lifetime](Lifetime.md).[_constructorStack](Lifetime.md#_constructorstack)
#### Defined in
[ts/lifetime.ts:32](https://github.com/justjake/quickjs-emscripten/blob/main/ts/lifetime.ts#L32)
___
### \_owner
• `Protected` `Optional` `Readonly` **\_owner**: `Owner`
#### Inherited from
[Lifetime](Lifetime.md).[_owner](Lifetime.md#_owner)
___
### \_value
• `Protected` `Readonly` **\_value**: `T`
#### Inherited from
[Lifetime](Lifetime.md).[_value](Lifetime.md#_value)
___
### copier
• `Protected` `Optional` `Readonly` **copier**: (`value`: `T` \| `TCopy`) => `TCopy`
#### Type declaration
▸ (`value`): `TCopy`
##### Parameters
| Name | Type |
| :------ | :------ |
| `value` | `T` \| `TCopy` |
##### Returns
`TCopy`
#### Inherited from
[Lifetime](Lifetime.md).[copier](Lifetime.md#copier)
___
### disposer
• `Protected` `Optional` `Readonly` **disposer**: (`value`: `T` \| `TCopy`) => `void`
#### Type declaration
▸ (`value`): `void`
##### Parameters
| Name | Type |
| :------ | :------ |
| `value` | `T` \| `TCopy` |
##### Returns
`void`
#### Inherited from
[Lifetime](Lifetime.md).[disposer](Lifetime.md#disposer)
## Accessors
### alive
• `get` **alive**(): `boolean`
#### Returns
`boolean`
#### Inherited from
Lifetime.alive
#### Defined in
[ts/lifetime.ts:49](https://github.com/justjake/quickjs-emscripten/blob/main/ts/lifetime.ts#L49)
___
### dupable
• `get` **dupable**(): `boolean`
#### Returns
`boolean`
#### Inherited from
Lifetime.dupable
#### Defined in
[ts/lifetime.ts:68](https://github.com/justjake/quickjs-emscripten/blob/main/ts/lifetime.ts#L68)
___
### owner
• `get` **owner**(): `undefined` \| `Owner`
#### Returns
`undefined` \| `Owner`
#### Inherited from
Lifetime.owner
#### Defined in
[ts/lifetime.ts:64](https://github.com/justjake/quickjs-emscripten/blob/main/ts/lifetime.ts#L64)
___
### value
• `get` **value**(): `T`
The value this Lifetime protects. You must never retain the value - it
may become invalid, leading to memory errors.
**`throws`** If the lifetime has been [dispose](WeakLifetime.md#dispose)d already.
#### Returns
`T`
#### Inherited from
Lifetime.value
#### Defined in
[ts/lifetime.ts:59](https://github.com/justjake/quickjs-emscripten/blob/main/ts/lifetime.ts#L59)
## Methods
### consume
▸ **consume**<`O`\>(`map`): `O`
Call `map` with this lifetime, then dispose the lifetime.
#### Type parameters
| Name |
| :------ |
| `O` |
#### Parameters
| Name | Type |
| :------ | :------ |
| `map` | (`lifetime`: [`WeakLifetime`](WeakLifetime.md)<`T`, `TCopy`, `Owner`\>) => `O` |
#### Returns
`O`
the result of `map(this)`.
#### Inherited from
[Lifetime](Lifetime.md).[consume](Lifetime.md#consume)
#### Defined in
[ts/lifetime.ts:92](https://github.com/justjake/quickjs-emscripten/blob/main/ts/lifetime.ts#L92)
▸ **consume**<`O`\>(`map`): `O`
#### Type parameters
| Name |
| :------ |
| `O` |
#### Parameters
| Name | Type |
| :------ | :------ |
| `map` | (`lifetime`: [`QuickJSHandle`](../modules.md#quickjshandle)) => `O` |
#### Returns
`O`
#### Inherited from
[Lifetime](Lifetime.md).[consume](Lifetime.md#consume)
#### Defined in
[ts/lifetime.ts:95](https://github.com/justjake/quickjs-emscripten/blob/main/ts/lifetime.ts#L95)
___
### dispose
▸ **dispose**(): `void`
Dispose of [value](WeakLifetime.md#value) and perform cleanup.
#### Returns
`void`
#### Overrides
[Lifetime](Lifetime.md).[dispose](Lifetime.md#dispose)
#### Defined in
[ts/lifetime.ts:166](https://github.com/justjake/quickjs-emscripten/blob/main/ts/lifetime.ts#L166)
___
### dup
▸ **dup**(): [`Lifetime`](Lifetime.md)<`TCopy`, `TCopy`, `Owner`\>
Create a new handle pointing to the same [value](WeakLifetime.md#value).
#### Returns
[`Lifetime`](Lifetime.md)<`TCopy`, `TCopy`, `Owner`\>
#### Inherited from
[Lifetime](Lifetime.md).[dup](Lifetime.md#dup)
#### Defined in
[ts/lifetime.ts:75](https://github.com/justjake/quickjs-emscripten/blob/main/ts/lifetime.ts#L75)
|
