22 lines
876 B
Text
22 lines
876 B
Text
#lang lean4
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constant SPointed : PointedType
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def S : Type := SPointed.type
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instance : Inhabited S := ⟨SPointed.val⟩
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@[extern "lean_mk_S"] constant mkS (x y : UInt32) (s : @& String) : S
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@[extern "lean_S_add_x_y"] constant S.addXY (s : @& S) : UInt32
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@[extern "lean_S_string"] constant S.string (s : @& S) : String
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-- The following 3 externs have side effects. Thus, we put them in IO.
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@[extern "lean_S_global_append"] constant appendToGlobalS (str : @& String) : IO Unit
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@[extern "lean_S_global_string"] constant getGlobalString : IO String
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@[extern "lean_S_update_global"] constant updateGlobalS (s : @& S) : IO Unit
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def main : IO Unit := do
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IO.println (mkS 10 20 "hello").addXY;
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IO.println (mkS 10 20 "hello").string;
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appendToGlobalS "foo";
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appendToGlobalS "bla";
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getGlobalString >>= IO.println;
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updateGlobalS (mkS 0 0 "world");
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getGlobalString >>= IO.println;
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pure ()
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