Optimizing valarray::operator=(some-valarray-expression)
llvm-svn: 136291
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: f4a797e3d2352de73ddee7707bf9cc114fd49134
diff --git a/include/valarray b/include/valarray
index 40c1fe1..d7a173c 100644
--- a/include/valarray
+++ b/include/valarray
@@ -817,6 +817,8 @@
valarray& operator=(const gslice_array<value_type>& __ga);
valarray& operator=(const mask_array<value_type>& __ma);
valarray& operator=(const indirect_array<value_type>& __ia);
+ template <class _ValExpr>
+ valarray& operator=(const __val_expr<_ValExpr>& __v);
// element access:
_LIBCPP_INLINE_VISIBILITY
@@ -2959,6 +2961,21 @@
}
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>
inline _LIBCPP_INLINE_VISIBILITY
__val_expr<__slice_expr<const valarray<_Tp>&> >
valarray<_Tp>::operator[](slice __s) const