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Reduce the number of move constructions when constructing a std::function. This fixes http://llvm.org/bugs/show_bug.cgi?id=12105.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@151652 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Howard Hinnant 2012-02-28 19:47:38 +00:00
parent 0438ea241e
commit 4a13b2dce9
1 changed files with 16 additions and 2 deletions
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18
include/functional
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@ -989,9 +989,23 @@ class __func<_Fp, _Alloc, _Rp(_ArgTypes...)>
__compressed_pair<_Fp, _Alloc> __f_;
public:
_LIBCPP_INLINE_VISIBILITY
explicit __func(_Fp __f) : __f_(_VSTD::move(__f)) {}
explicit __func(_Fp&& __f)
: __f_(piecewise_construct, _VSTD::forward_as_tuple(_VSTD::move(__f)),
_VSTD::forward_as_tuple()) {}
_LIBCPP_INLINE_VISIBILITY
explicit __func(_Fp __f, _Alloc __a) : __f_(_VSTD::move(__f), _VSTD::move(__a)) {}
explicit __func(const _Fp& __f, const _Alloc& __a)
: __f_(piecewise_construct, _VSTD::forward_as_tuple(__f),
_VSTD::forward_as_tuple(__a)) {}
_LIBCPP_INLINE_VISIBILITY
explicit __func(const _Fp& __f, _Alloc&& __a)
: __f_(piecewise_construct, _VSTD::forward_as_tuple(__f),
_VSTD::forward_as_tuple(_VSTD::move(__a))) {}
_LIBCPP_INLINE_VISIBILITY
explicit __func(_Fp&& __f, _Alloc&& __a)
: __f_(piecewise_construct, _VSTD::forward_as_tuple(_VSTD::move(__f)),
_VSTD::forward_as_tuple(_VSTD::move(__a))) {}
virtual __base<_Rp(_ArgTypes...)>* __clone() const;
virtual void __clone(__base<_Rp(_ArgTypes...)>*) const;
virtual void destroy() _NOEXCEPT;