mathlib documentation

core / init.meta.derive

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meta def derive_handler  :
Type

A handler that may or may not be able to implement the typeclass cls for decl. It should return tt if it was able to derive cls and ff if it does not know how to derive cls, in which case lower-priority handlers will be tried next.

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meta def derive_handler_attr  :
(user_attribute unit)
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meta def derive_attr  :
user_attribute unit (list pexpr)
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meta def instance_derive_handler (cls : name) (tac : tactic unit) (univ_poly : bool := tt) (modify_target : name → list expr → expr → tactic expr := λ (_x : name) (_x : list expr), pure) :
derive_handler

Given a tactic tac that can solve an application of cls in the right context, instance_derive_handler uses it to build an instance declaration of cls n.

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meta def has_reflect_derive_handler  :
derive_handler
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meta def has_sizeof_derive_handler  :
derive_handler
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@[protected, instance]
meta def interactive.loc.has_reflect  :
has_reflect interactive.loc
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@[protected, instance]
meta def prod.has_reflect (α : Type) [a : has_reflect α] (β : Type) [a_1 : has_reflect β] [a_2 : reflected α] [a_3 : reflected β] :
has_reflect (α × β)
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@[protected, instance]
meta def bool.has_reflect  :
has_reflect bool
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@[protected, instance]
meta def sum.has_reflect (α : Type) [a : has_reflect α] (β : Type) [a_1 : has_reflect β] [a_2 : reflected α] [a_3 : reflected β] :
has_reflect (α ⊕ β)
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@[protected, instance]
meta def option.has_reflect (α : Type) [a : has_reflect α] [a_1 : reflected α] :
has_reflect (option α)
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@[protected, instance]
meta def pos.has_reflect  :
has_reflect pos