A collection of type-classes generalizing the read/write/modify operations for stateful variables provided by things like IORef, TVar, &c. Note that The interface has changed a bit from the 0.2.* version. "Ref" functions are now called "Reference" and new "*Ref" function exist with simpler signatures. The new 'Ref' existential type provides a convenient monad-indexed reference type, and the HasRef class indicates monads for which there is a default reference type for every referent.
| Package Version | Update ID | Released | Package Hub Version | Platforms | Subpackages |
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| 0.3-bp155.2.13 info | GA Release | 2023-05-22 | 15 SP5 |
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| 0.3-bp154.1.14 info | GA Release | 2022-05-09 | 15 SP4 |
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| 0.3-bp153.1.18 info | GA Release | 2021-04-08 | 15 SP3 |
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| 0.3-bp152.3.17 info | GA Release | 2020-06-16 | 15 SP2 |
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| 0.3-bp151.3.2 info | GA Release | 2019-07-17 | 15 SP1 |
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| 0.3-bp151.2.17 info | GA Release | 2019-05-31 | 15 SP1 |
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| 0.3-bp150.2.7 info | GA Release | 2018-07-31 | 15 |
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| 0.3-bp150.2.6 info | GA Release | 2018-07-30 | 15 |
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