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follow #8463 #14157 and document cstring literals modification is not allowed (#15878)

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* follow #8463 #14157 and document cstring literals
* Update doc/manual.rst

Co-authored-by: Juan Carlos <juancarlospaco@gmail.com>
Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
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flywind 2020-11-12 22:28:45 +08:00 • committed by GitHub
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doc/manual.rst
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@ -1280,6 +1280,20 @@ string from a cstring:
var cstr: cstring = str var cstr: cstring = str
var newstr: string = $cstr var newstr: string = $cstr
``cstring`` literals shouldn't be modified.
.. code-block:: nim
var x = cstring"literals"
x[1] = 'A' # This is wrong!!!
If the ``cstring`` originates from a regular memory (not read-only memory),
it can be modified:
.. code-block:: nim
var x = "123456"
var s: cstring = x
s[0] = 'u' # This is ok
Structured types Structured types
---------------- ----------------
A variable of a structured type can hold multiple values at the same A variable of a structured type can hold multiple values at the same