[PATCH] Add missing return to uninitialized_default_construct_n

[Jonathan Wakely]

This non-void function was missing a return statement.

        * include/bits/stl_uninitialized.h
        (__uninitialized_default_novalue_n_1<true>): Add missing return.
        * testsuite/20_util/specialized_algorithms/memory_management_tools/
        1.cc: Check return values of uninitialized_xxx_n algorithms.

Tested powerpc64le-linux, committed to trunk.


commit fe1f02d734ca135872688f8371542ca7f17aae7e
Author: redi <redi@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Wed Oct 12 11:20:35 2016 +0000

    Add missing return to uninitialized_default_construct_n
    
        * include/bits/stl_uninitialized.h
        (__uninitialized_default_novalue_n_1<true>): Add missing return.
        * testsuite/20_util/specialized_algorithms/memory_management_tools/
        1.cc: Check return values of uninitialized_xxx_n algorithms.
    
    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@241033 
138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/libstdc++-v3/include/bits/stl_uninitialized.h 
b/libstdc++-v3/include/bits/stl_uninitialized.h
index ef2e584..07370c9 100644
--- a/libstdc++-v3/include/bits/stl_uninitialized.h
+++ b/libstdc++-v3/include/bits/stl_uninitialized.h
@@ -705,8 +705,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       template<typename _ForwardIterator, typename _Size>
        static _ForwardIterator
        __uninit_default_novalue_n(_ForwardIterator __first, _Size __n)
-       {
-       }
+       { return std::next(__first, __n); }
     };
 
   // __uninitialized_default_novalue
diff --git 
a/libstdc++-v3/testsuite/20_util/specialized_algorithms/memory_management_tools/1.cc
 
b/libstdc++-v3/testsuite/20_util/specialized_algorithms/memory_management_tools/1.cc
index 84a6857..a86e61a 100644
--- 
a/libstdc++-v3/testsuite/20_util/specialized_algorithms/memory_management_tools/1.cc
+++ 
b/libstdc++-v3/testsuite/20_util/specialized_algorithms/memory_management_tools/1.cc
@@ -74,15 +74,17 @@ void test02()
 void test03()
 {
   char test_data[] = "123456";
-  std::uninitialized_default_construct_n(std::begin(test_data), 6);
+  auto end = std::uninitialized_default_construct_n(std::begin(test_data), 6);
   VERIFY(std::string(test_data) == "123456");
+  VERIFY( end == test_data + 6 );
 }
 
 void test04()
 {
   char test_data[] = "123456";
-  std::uninitialized_value_construct_n(std::begin(test_data), 6);
-  VERIFY(std::string(test_data, 6) == std::string("\0\0\0\0\0\0", 6));
+  auto end = std::uninitialized_value_construct_n(std::begin(test_data), 5);
+  VERIFY(std::string(test_data, 6) == std::string("\0\0\0\0\0" "6", 6));
+  VERIFY( end == test_data + 5 );
 }
 
 void test05()
@@ -112,8 +114,9 @@ void test07()
   del_count = 0;
   DelCount* x = (DelCount*)malloc(sizeof(DelCount)*10);
   for (int i = 0; i < 10; ++i) new (x+i) DelCount;
-  std::destroy_n(x, 10);
+  auto end = std::destroy_n(x, 10);
   VERIFY(del_count == 10);
+  VERIFY( end == x + 10 );
   del_count = 0;
   free(x);
 }
@@ -127,7 +130,8 @@ void test08()
   std::uninitialized_move(source.begin(), source.end(), target);
   for (const auto& x : source) VERIFY(!x);
   for (int i = 0; i < 10; ++i) VERIFY(bool(*(target+i)));
-  std::destroy_n(target, 10);
+  auto end = std::destroy_n(target, 10);
+  VERIFY( end == target + 10 );
   free(target);
 }
 
@@ -137,10 +141,13 @@ void test09()
   for (int i = 0; i < 10; ++i) source.push_back(std::make_unique<int>(i));
   std::unique_ptr<int>* target =
     (std::unique_ptr<int>*)malloc(sizeof(std::unique_ptr<int>)*10);
-  std::uninitialized_move_n(source.begin(), 10, target);
+  auto end = std::uninitialized_move_n(source.begin(), 10, target);
+  VERIFY( end.first == source.begin() + 10 );
+  VERIFY( end.second == target + 10 );
   for (const auto& x : source) VERIFY(!x);
   for (int i = 0; i < 10; ++i) VERIFY(bool(*(target+i)));
-  std::destroy_n(target, 10);
+  auto end2 = std::destroy_n(target, 10);
+  VERIFY( end2 == target + 10 );
   free(target);
 }
 
@@ -156,7 +163,8 @@ void test11()
 {
   char* x = (char*)malloc(sizeof(char)*10);
   for (int i = 0; i < 10; ++i) new (x+i) char;
-  std::destroy_n(x, 10);
+  auto end = std::destroy_n(x, 10);
+  VERIFY( end == x + 10 );
   free(x);
 }
 
@@ -285,10 +293,12 @@ void test19()
 {
   char test_source[] = "123456";
   char test_target[] = "000000";
-  std::uninitialized_move_n(std::begin(test_source),
-                           6,
-                           test_target);
+  auto end = std::uninitialized_move_n(std::begin(test_source),
+                                       6,
+                                       test_target);
   VERIFY(std::string(test_target) == "123456");
+  VERIFY( end.first == test_source + 6 );
+  VERIFY( end.second == test_target + 6 );
 }
 
 int main()