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Added a note + eg about custom exceptions #12847

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Dec 8, 2019
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Added a note + eg about custom exceptions #12847

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17 changes: 17 additions & 0 deletions doc/manual.rst
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Expand Up @@ -4129,6 +4129,23 @@ error message from ``e``, and for such situations it is enough to use
except:
echo getCurrentExceptionMsg()

Custom exceptions
-----------------

Is it possible to create custom exceptions. These make it easy to distinguish between exceptions raised by nim and those from your own code.

A custom exception is a custom type:

.. code-block:: nim
type
LoadError* = object of Exception

Ending the custom exception's name with ``Error`` is recommended.

Custom exceptions can be raised like any others, e.g.:

.. code-block:: nim
raise newException(LoadError, "Failed to load data")

Defer statement
---------------
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