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Merge branch 'araq' of github.com:nim-lang/Nim into araq

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Andreas Rumpf 2017-09-15 16:08:16 +02:00
commit 053b0ad6f3
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20
doc/manual/types.txt
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@ -136,26 +136,6 @@ determined). Assignments from the base type to one of its subrange types
A subrange type has the same size as its base type (``int`` in the example).
Nim requires `interval arithmetic`:idx: for subrange types over a set
of built-in operators that involve constants: ``x %% 3`` is of
type ``range[0..2]``. The following built-in operators for integers are
affected by this rule: ``-``, ``+``, ``*``, ``min``, ``max``, ``succ``,
``pred``, ``mod``, ``div``, ``%%``, ``and`` (bitwise ``and``).
Bitwise ``and`` only produces a ``range`` if one of its operands is a
constant *x* so that (x+1) is a power of two.
(Bitwise ``and`` is then a ``%%`` operation.)
This means that the following code is accepted:
.. code-block:: nim
case (x and 3) + 7
of 7: echo "A"
of 8: echo "B"
of 9: echo "C"
of 10: echo "D"
# note: no ``else`` required as (x and 3) + 7 has the type: range[7..10]
Pre-defined floating point types
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