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Add StateT Monad Transformer #952

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Add StateT Monad Transformer #952

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de0cc6b
Add StateT Monad Transformer
JasonGross Apr 20, 2023
b33c544
Add {get,set,update}_state
JasonGross Apr 20, 2023
d538d2f
Adjust state monad utils
JasonGross Apr 20, 2023
d0d517b
Unset Universe Minimization ToSet in monad_utils
JasonGross Apr 20, 2023
54f23e1
Add State.run_drop_state
JasonGross Apr 24, 2023
bb7f52f
Rename run_drop_state to evalStateT to match with ExtLib
JasonGross Apr 24, 2023
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Add StateT Monad Transformer
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@JasonGross
JasonGross committed Apr 24, 2023
commit de0cc6b29b74c1f49976d9dd8456f1d620c13424
7 changes: 7 additions & 0 deletions utils/theories/monad_utils.v
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Expand Up @@ -69,6 +69,13 @@ Import MCMonadNotation.

Open Scope monad.

Definition StateT S M T := S -> M (T * S)%type.
Definition StateT_Monad {S T} {TM : Monad T} : Monad (StateT S T) :=
{| ret A a st := ret (a, st) ;
bind A B m f st := '(m, st) <- m st;; f m st
|}.
#[export] Hint Extern 1 (Monad (StateT ?S ?T)) => simple apply (@StateT_Monad S T) : typeclass_instances.

Section MapOpt.
Context {A} {B} (f : A -> option B).

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