Review Request 121263: Prevent API abuse of calling setters on temporary objects.

[Milian Wolff]

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https://git.reviewboard.kde.org/r/121263/
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Review request for KDE Frameworks, Christoph Cullmann, Dominik Haumann, and Kevin Funk.


Repository: ktexteditor


Description
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In KDevelop we currently hit this often since our old class
previously returned a reference for the start/end getters of range
and cursor. With the help of C++11 ref qualifiers, we can detect that
and let the compiler give the user an error message:

error: cannot initialize object parameter of type 'KTextEditor::Cursor'
with an expression of type 'KTextEditor::Cursor'
    documentRange().start().setColumn(42);
    ^~~~~~~~~~~~~~~~~~~~~~~

Yes, the error message is pretty bad. But better than nothing? We
could also mark the && overloads of these functions as explictily
deleted, which would slightly improve the error message...


Diffs
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  src/include/CMakeLists.txt 94b8e79e2f2b273ec344a963ba6ac81ec5a481c6 
  src/include/ktexteditor/cursor.h 4ebe38fc1bffb2dad02150884fd225fe3ca9e193 
  src/include/ktexteditor/global.h PRE-CREATION 
  src/include/ktexteditor/range.h 1a2fc5b200c70364c3d99223e43a2ad6179055de 

Diff: https://git.reviewboard.kde.org/r/121263/diff/


Testing
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Thanks,

Milian Wolff

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