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Optimizing valarray::operator=(some-valarray-expression)

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@136291 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Howard Hinnant 2011-07-27 23:19:59 +00:00
parent 9c59d38112
commit db86663223
1 changed files with 17 additions and 0 deletions
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17
include/valarray
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@ -817,6 +817,8 @@ public:
valarray& operator=(const gslice_array<value_type>& __ga); valarray& operator=(const gslice_array<value_type>& __ga);
valarray& operator=(const mask_array<value_type>& __ma); valarray& operator=(const mask_array<value_type>& __ma);
valarray& operator=(const indirect_array<value_type>& __ia); valarray& operator=(const indirect_array<value_type>& __ia);
template <class _ValExpr>
valarray& operator=(const __val_expr<_ValExpr>& __v);
// element access: // element access:
_LIBCPP_INLINE_VISIBILITY _LIBCPP_INLINE_VISIBILITY
@ -2958,6 +2960,21 @@ valarray<_Tp>::operator=(const indirect_array<value_type>& __ia)
return *this; return *this;
} }
template <class _Tp>
template <class _ValExpr>
inline _LIBCPP_INLINE_VISIBILITY
valarray<_Tp>&
valarray<_Tp>::operator=(const __val_expr<_ValExpr>& __v)
{
size_t __n = __v.size();
if (size() != __n)
resize(__n);
value_type* __t = __begin_;
for (size_t __i = 0; __i != __n; ++__t, ++__i)
*__t = result_type(__v[__i]);
return *this;
}
template <class _Tp> template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY inline _LIBCPP_INLINE_VISIBILITY
__val_expr<__slice_expr<const valarray<_Tp>&> > __val_expr<__slice_expr<const valarray<_Tp>&> >