From: François Dumont <fdumont@gcc.gnu.org>
Date: Sun, 6 Oct 2019 15:53:51 +0000 (+0000)
Subject: Add std::copy_n istreambuf_iterator specialization
X-Git-Tag: upstream/12.2.0~21358
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5daedc02185507dc3241d89ec51f4a096e23965b;p=platform%2Fupstream%2Fgcc.git

Add std::copy_n istreambuf_iterator specialization

	Commit this missing part which had been rejected.

From-SVN: r276640
---

diff --git a/libstdc++-v3/include/bits/stl_algo.h b/libstdc++-v3/include/bits/stl_algo.h
index 187c732..661db02 100644
--- a/libstdc++-v3/include/bits/stl_algo.h
+++ b/libstdc++-v3/include/bits/stl_algo.h
@@ -778,8 +778,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _InputIterator, typename _Size, typename _OutputIterator>
     _GLIBCXX20_CONSTEXPR
     _OutputIterator
-    __copy_n(_InputIterator __first, _Size __n,
-	     _OutputIterator __result, input_iterator_tag)
+    __copy_n_a(_InputIterator __first, _Size __n, _OutputIterator __result)
     {
       if (__n > 0)
 	{
@@ -795,6 +794,22 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	}
       return __result;
     }
+ 
+  template<typename _CharT, typename _Size>
+    __enable_if_t<__is_char<_CharT>::__value, _CharT*>
+    __copy_n_a(istreambuf_iterator<_CharT, char_traits<_CharT>>,
+	       _Size, _CharT*);
+
+  template<typename _InputIterator, typename _Size, typename _OutputIterator>
+    _GLIBCXX20_CONSTEXPR
+    _OutputIterator
+    __copy_n(_InputIterator __first, _Size __n,
+	     _OutputIterator __result, input_iterator_tag)
+    {
+      return std::__niter_wrap(__result,
+			       __copy_n_a(__first, __n,
+					  std::__niter_base(__result)));
+    }
 
   template<typename _RandomAccessIterator, typename _Size,
 	   typename _OutputIterator>