2017-03-28 06:56:24 +00:00
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<?xml version="1.0" encoding="UTF-8" ?>
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<testsuite errors="0" failures="2" tests="4" name="tst_PairDiagnostics">
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<properties>
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<property value="@INSERT_QT_VERSION_HERE@" name="QTestVersion"/>
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<property value="@INSERT_QT_VERSION_HERE@" name="QtVersion"/>
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<property value="" name="QtBuild"/>
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</properties>
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<testcase result="pass" name="initTestCase"/>
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<testcase result="fail" name="testQPair">
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<failure message="Compared values are not the same
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Long live std::pair!
Make QPair an alias for std::pair, and qMakePair just a forwarder
towards std::make_pair.
Why? Fundamentally to ditch a bunch of NIH code; gain for free
structured bindings, std::tuple and std::reference_wrapper
compatibility, and so on.
Breakages:
* Some that code manually forward declares QPair.
We don't care about it (<QContainerFwd> is the proper way).
* Some code that overloads on std::pair and QPair. Luckily
it's mostly centralized: debug, metatypes, testing macros.
Just remove the QPair overload.
* Usages of qMakePair forcing the template type parameters.
There are a handful of these in qtbase, but only one was actually
broken.
* std::pair is NOT (and will never likely be) trivially copiable.
This is agreed to be a mistake done by practically all implementations
in C++11, can can't be fixed without breaking ABI.
Some code using QPair assuming it's trivially copiable may break;
exactly one occurrence was in qtbase.
* QMetaType logic extracts the type names in two different ways,
one by looking at the source code string (e.g. extracted by moc)
and one via some ad-hoc reflection in C++. We need to make
"QPair" (as spelled in the source code) be the same as "std::pair"
(gathered via reflection, which will see through the alias)
when compared. The way it's already done e.g. for QList is
by actually replacing the moc-extracted name with the name
of the actual type used in C++; do the same here.
On libc++, std::pair is actually in an inline namespace --
i.e. std::__1::pair; the reflection will extract and store
"std::__1::pair" so we need an ad-hoc fix to QMetaType.
[ChangeLog][QtCore][QPair] QPair is now an alias to std::pair,
and does not exist as a class in Qt any more. This may break
code such as functions overloaded for both QPair and std::pair.
Usually, the overload taking a QPair can be safely discarded,
leaving only the one taking a std::pair. QPair API has not changed,
and qMakePair is still available for compatibility (although
new code is encouraged to use std::pair and std::make_pair
directly instead).
Change-Id: I7725c751bf23946cde577b1406e86a336c0a3dcf
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
2020-02-14 23:11:22 +00:00
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Actual (pair1): "std::pair(1,1)"
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Expected (pair2): "std::pair(1,2)"" result="fail"/>
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2017-03-28 06:56:24 +00:00
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</testcase>
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<testcase result="fail" name="testStdPair">
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<failure message="Compared values are not the same
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Actual (pair1): "std::pair(1,1)"
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Expected (pair2): "std::pair(1,2)"" result="fail"/>
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</testcase>
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<testcase result="pass" name="cleanupTestCase"/>
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<system-err/>
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</testsuite>
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