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QString: add char8_t overload of fromUtf8()

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Use the overload-with-template trick from P1423 to avoid ambiguities
when existing callers pass 0 or nullptr.

Add a qdoc-ignored macro to hide the fact that the overload is a
template.

[ChangeLog][QtCore][QString] Added char8_t overload of fromUtf8().

Change-Id: Iaa2d365bfa161ef36cc73fa3bad50aabf34d01db
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Marc Mutz 2020-06-22 11:44:34 +02:00
parent 1304040e5d
commit 44da43e8e4
6 changed files with 28 additions and 1 deletions
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1
doc/global/qt-cpp-defines.qdocconf
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@ -132,6 +132,7 @@ Cpp.ignoretokens += \
Q_SVG_EXPORT \
Q_TESTLIB_EXPORT \
Q_TYPENAME \
Q_WEAK_OVERLOAD \
Q_WIDGETS_EXPORT \
Q_WINEXTRAS_EXPORT \
Q_XML_EXPORT \

6
src/corelib/global/qcompilerdetection.h
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@ -1232,6 +1232,12 @@
# define QT_MAKE_CHECKED_ARRAY_ITERATOR(x, N) (x)
#endif
/*
* "Weak overloads" - makes an otherwise confliciting overload weaker
* (by making it a template)
*/
#define Q_WEAK_OVERLOAD template <typename = void>
/*
* Warning/diagnostic handling
*/

8
src/corelib/text/qstring.cpp
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@ -5097,6 +5097,14 @@ QString QString::fromLocal8Bit_helper(const char *str, int size)
\sa toUtf8(), fromLatin1(), fromLocal8Bit()
*/
/*!
\fn QString QString::fromUtf8(const char8_t *str, qsizetype size)
\overload
\since 6.0
This overload is only available when compiling in C++20 mode.
*/
/*!
\fn QString QString::fromUtf8(const QByteArray &str)
\overload

5
src/corelib/text/qstring.h
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@ -658,6 +658,11 @@ public:
{
return fromUtf8_helper(str, (str && size == -1) ? int(strlen(str)) : size);
}
#ifdef __cpp_char8_t
Q_WEAK_OVERLOAD
static inline QString fromUtf8(const char8_t *str, qsizetype size = -1)
{ return fromUtf8(reinterpret_cast<const char *>(str), int(size)); }
#endif
static inline QString fromLocal8Bit(const char *str, int size = -1)
{
return fromLocal8Bit_helper(str, (str && size == -1) ? int(strlen(str)) : size);

3
tests/auto/corelib/text/qstring/qstring.pro
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@ -3,7 +3,8 @@ TARGET = tst_qstring
QT = core-private testlib
SOURCES = tst_qstring.cpp
# DEFINES += QT_NO_CAST_TO_ASCII # actively #undef-ed by tst_qstring.cpp
qtConfig(c++11): CONFIG += c++11
qtConfig(c++1z): CONFIG += c++1z
qtConfig(c++2a): CONFIG += c++2a
DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0
!qtConfig(doubleconversion):!qtConfig(system-doubleconversion) {

6
tests/auto/corelib/text/qstring/tst_qstring.cpp
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@ -4216,9 +4216,15 @@ void tst_QString::nullFromUtf8()
a = QString::fromUtf8(0);
QVERIFY(a.isNull());
QVERIFY(a.isEmpty());
a = QString::fromUtf8(nullptr);
QVERIFY(a.isNull());
QVERIFY(a.isEmpty());
a = QString::fromUtf8("");
QVERIFY(!a.isNull());
QVERIFY(a.isEmpty());
a = QString::fromUtf8(u8""); // char in C++17 / char8_t in C++20
QVERIFY(!a.isNull());
QVERIFY(a.isEmpty());
a = QString::fromUtf8(QByteArray());
QVERIFY(a.isNull());
QVERIFY(a.isEmpty());