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documented converters

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Araq 2014-12-12 14:52:06 +01:00
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doc/manual/procs.txt
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@ -584,3 +584,23 @@ parameters of an outer factory proc:
a for loop, the compiler will implicity use the ``auto`` return type if no a for loop, the compiler will implicity use the ``auto`` return type if no
type is given by the user. In contrast, since closure iterators can be used type is given by the user. In contrast, since closure iterators can be used
as a collaborative tasking system, ``void`` is a valid return type for them. as a collaborative tasking system, ``void`` is a valid return type for them.
Converters
==========
A converter is like an ordinary proc except that it enhances
the "implicitly convertible" type relation (see `Convertible relation`_):
.. code-block:: nim
# bad style ahead: Nim is not C.
converter toBool(x: int): bool = x != 0
if 4:
echo "compiles"
A converter can also be explicitly invoked for improved readability. Note that
implicit converter chaining is not supported: If there is a converter from
type A to type B and from type B to type C the implicit conversion from A to C
is not provided.