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add record syntax for defining a value of structure type #318

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add record syntax for defining a value of structure type #318

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7 changes: 5 additions & 2 deletions MIL/C07_Structures/S01_Structures.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -50,9 +50,12 @@ def myPoint1 : Point where
z := 4

def myPoint2 : Point :=
{ x := 2, y := -1, z := 4 }

def myPoint3 : Point :=
⟨2, -1, 4⟩

def myPoint3 :=
def myPoint4 :=
Point.mk 2 (-1) 4
-- QUOTE.

Expand All @@ -67,7 +70,7 @@ def myPoint3 :=

In the first example, the fields of the structure are named
explicitly.
The function ``Point.mk`` referred to in the definition of ``myPoint3``
The function ``Point.mk`` referred to in the definition of ``myPoint4``
is known as the *constructor* for the ``Point`` structure, because
it serves to construct elements.
You can specify a different name if you want, like ``build``.
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