only) for Expected<T> so that it can interoperate with MSVC's std::future
implementation.
MSVC 2013's std::future implementation requires the wrapped type to be default
constructible.
Hopefully this will fix the bot breakage in
http://lab.llvm.org:8011/builders/clang-x86-win2008-selfhost/builds/9937 .
llvm-svn: 280058
typedef const typename std::remove_reference<T>::type *const_pointer;
public:
+
+#ifdef _MSC_VER
+ // WARNING: This constructor should *never* be called in user code.
+ // It is provided under MSVC only so that Expected can be used
+ // with MSVC's <future> header, which requires types to be default
+ // constructible.
+ //
+ // FIXME; Kill this as soon as MSVC's <future> implementation no longer
+ // requires types to be default constructible.
+ Expected()
+ : HasError(true)
+#ifndef NDEBUG
+ ,
+ Checked(true)
+#endif // NDEBUG
+ {
+ new (getErrorStorage()) Error();
+ !!*getErrorStorage();
+ }
+#endif // _MSC_VER
+
/// Create an Expected<T> error value from the given Error.
Expected(Error Err)
: HasError(true)