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manual: add a note about the terminating zero for strings; refs #5596

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Araq 2018-09-03 12:06:34 +02:00
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@ -1004,6 +1004,11 @@ All string literals are of the type ``string``. A string in Nim is very
similar to a sequence of characters. However, strings in Nim are both similar to a sequence of characters. However, strings in Nim are both
zero-terminated and have a length field. One can retrieve the length with the zero-terminated and have a length field. One can retrieve the length with the
builtin ``len`` procedure; the length never counts the terminating zero. builtin ``len`` procedure; the length never counts the terminating zero.
The terminating zero cannot be accessed unless the string is converted
to the ``cstring`` type first. The terminating zero assures that this
conversion can be done in O(1) and without any allocations.
The assignment operator for strings always copies the string. The assignment operator for strings always copies the string.
The ``&`` operator concatenates strings. The ``&`` operator concatenates strings.