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Fix libc++ bug #20039: 'Constructing std::function from empty compatible std::function results in half-empty state' Thanks to Agustin Berge for the report, and for his and Eric Fiselier's work on a fix.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@212070 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2014-06-30 21:27:51 +00:00
parent 394451db81
commit 2f9e714071
4 changed files with 46 additions and 5 deletions
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include/functional
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@@ -1421,7 +1421,7 @@ class _LIBCPP_TYPE_VIS_ONLY function<_Rp(_ArgTypes...)>
static bool __not_null(_R2 (_Cp::*__p)(_Ap...) const volatile) {return __p;}
template <class _R2, class ..._Ap>
_LIBCPP_INLINE_VISIBILITY
static bool __not_null(const function<_Rp(_Ap...)>& __p) {return __p;}
static bool __not_null(const function<_R2(_Ap...)>& __p) {return !!__p;}
template <class _Fp, bool = !is_same<_Fp, function>::value &&
__invokable<_Fp&, _ArgTypes...>::value>