QOffsetStringArray: fix compilation error with MSVC15/17

MSVC 2015/2017 has a bug with constexpr.
It is internal compiler error when we are using QtPrivate::IndexSequence
with more than 1024 items.

Example:

template<int ... I>
void foo(QtPrivate::IndexSequence<I...>) { }

void bar() {
    foo(QtPrivate::makeIndexSequence<1024>()); // works
    foo(QtPrivate::makeIndexSequence<1025>()); // error: C1202: recursive type or function dependency context too complex
}

Workaround:

template<typename>
struct Foo;

template<int ... I>
struct Foo<QtPrivate::IndexSequence<I...>>{
    static constexpr void call() { }
};

void bar() {
    Foo<QtPrivate::makeIndexSequence<1025>>::call(); // works
}

Change-Id: Iedbf5291ac4a9f51f8b5f6b76b83baba920c092d
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

0 files changed, 0 insertions, 0 deletions