structure Lean.ProjectionFunctionInfo : Type

Given a structure S, Lean automatically creates an auxiliary definition (projection function) for each field. This structure caches information about these auxiliary definitions.

• ctorName : Name

  Constructor associated with the auxiliary projection function.

• numParams : Nat

  Number of parameters in the structure

• i : Nat

  The field index associated with the auxiliary projection function.

• fromClass : Bool

  true if the structure is a class.

instance Lean.instInhabitedProjectionFunctionInfo : Inhabited ProjectionFunctionInfo

instance Lean.instReprProjectionFunctionInfo : Repr ProjectionFunctionInfo

@[export lean_mk_projection_info]

def Lean.mkProjectionInfoEx (ctorName : Name) (numParams i : Nat) (fromClass : Bool) : ProjectionFunctionInfo

@[export lean_projection_info_from_class]

def Lean.ProjectionFunctionInfo.fromClassEx (info : ProjectionFunctionInfo) : Bool

opaque Lean.projectionFnInfoExt : MapDeclarationExtension ProjectionFunctionInfo

@[export lean_add_projection_info]

def Lean.addProjectionFnInfo (env : Environment) (projName ctorName : Name) (numParams i : Nat) (fromClass : Bool) : Environment

@[export lean_get_projection_info]

def Lean.Environment.getProjectionFnInfo? (env : Environment) (projName : Name) : Option ProjectionFunctionInfo

def Lean.Environment.isProjectionFn (env : Environment) (declName : Name) : Bool

def Lean.Environment.getProjectionStructureName? (env : Environment) (projName : Name) : Option Name

If projName is the name of a projection function, return the associated structure name

def Lean.isProjectionFn {m : Type → Type} [MonadEnv m] [Monad m] (declName : Name) : m Bool

def Lean.getProjectionFnInfo? {m : Type → Type} [MonadEnv m] [Monad m] (declName : Name) : m (Option ProjectionFunctionInfo)