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update the doc

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cooldome
2018-04-29 23:17:07 +01:00
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doc/manual.rst
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@@ -741,22 +741,26 @@ For further details, see `Convertible relation
Subrange types
--------------
A subrange type is a range of values from an ordinal type (the base
A subrange type is a range of values from an ordinal or float point type (the base
type). To define a subrange type, one must specify it's limiting values: the
lowest and highest value of the type:
.. code-block:: nim
type
Subrange = range[0..5]
PositiveFloat = range[0.0..Inf]
``Subrange`` is a subrange of an integer which can only hold the values 0
to 5. Assigning any other value to a variable of type ``Subrange`` is a
to 5. ``PositiveFloat`` defines a subrange of all positive floating point values.
NaN does not belong to any subrange of floating point types.
Assigning any other value to a variable of type ``Subrange`` is a
checked runtime error (or static error if it can be statically
determined). Assignments from the base type to one of its subrange types
(and vice versa) are allowed.
A subrange type has the same size as its base type (``int`` in the example).
A subrange type has the same size as its base type (``int`` in the
Subrange example).
Pre-defined floating point types