jyapayne/Nim
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Merge pull request #7736 from cooldome/range_float_type

Browse source 
Language feature: range float types
This commit is contained in:
Andreas Rumpf 2018-06-27 00:08:21 +02:00 • committed by GitHub
commit d8f7174dda
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
6 changed files with 118 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

10
doc/manual.rst
View file

@ -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 floating 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