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The original (more complex and comprehensive) solution belongs to
https://oliora.github.io/2015/12/29/pimpl-and-rule-of-zero.html - this
commit only provides a small wrapper for non-copyable Private class
implementations common throughout libQuotient. Unlike the original,
default initialisation is made explicit - you have to pass
ZeroImpl<Private>() instead (and I firmly believe it's a good thing:
normally pointers to Private should not remain nullptr). The reason
ZeroImpl<> is not a template variable is quite simple: unique_ptr is
non-copyable and so cannot be initialised from; while a template
function will initialise the value in-place thanks to copy elision.
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After going through all the files and the history of commits on them
it was clear that some copyright statements are obsolete (the code has
been overwritten since) and some are missing. This commit tries best to
remedy that, along with adding SPDX tags where they were still not used.
Also, a minimal SPDX convention is documented for further contributions.
Closes #426.
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* QT_NO_URL_CAST_FROM_STRING makes it clearer where QUrls are created
from QStrings (which incurs a parsing cost).
* QT_STRICT_ITERATORS helps detecting where begin()/end() is used
instead of cbegin()/cend(). KDE developers have verified that
the generated assembly code is identical.
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Fixes a compilation warning that Private is a struct in one place and
a class in another.
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The response in the web browser is quite barebone, just enough
to give feedback that things are alright. Closes #386. Closes #388.
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