The original idea (8b5aa7b6c4) of the
separation of array and pointer ctors was to determine string literal
sizes at compile-time in C++11's limited constexpr semantics.
But when the scanning for NUL characters was added to the array ctor
in 107ff4c1d6, the distinction between
the two ctors became meaningless, because we were able to assume
post-C++11 constexpr to make the Char(0) scan a compile-time action.
Finally, 9e1dc1e8a9 removed the array
ctor in favor of the generic Container ctor. I didn't check whether
the old code handled arrays of unknown size, as in
extern const char16_t str[];
QStringView sv = str;
~~~
const char16_t str[] = "str";
but std::size() (and therefore if_compatible_container) surely bails
on such arrays, and if_compatible_pointer also SFINAEs out. As a
consequence, such arrays cannot be used to construct QStringViews atm.
Fix by adding a new constructor for arrays of unknown size, delegating
to the existing pointer overload.
The GHS compiler doesn't like the CanConvert static_asserts, so
comment them out for it. The functionality itself is tested by
the from*ArrayWithUnknownSize tests.
[ChangeLog][QtCore][QStringView] Made construction from arrays of
unknown size compile. Such arrays will use the const Char*
constructor, determining the size of the array at runtime.
Pick-to: 6.5
Task-number: QTBUG-112746
Change-Id: Ifdb217350d93d38f081c99f14661975491d32076
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 56faffd92bf0ac459a921ec043a6f3b3dba51acc)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 2dfc0cb6f6f1e29a0a1318793b29b89390543be6)
e11edced7e