From 6a5f540f08e1aec51c8a6464046cfe5ab8fa77af Mon Sep 17 00:00:00 2001
From: Bjorn Reese <breese@users.sourceforge.net>
Date: Sat, 11 Feb 2017 16:37:12 +0100
Subject: [PATCH] Removed std::ostringstream

---
 include/boost/core/lightweight_test.hpp | 29 ++++++++++++++-----------
 1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/include/boost/core/lightweight_test.hpp b/include/boost/core/lightweight_test.hpp
index d8a316e..5e0ef5c 100644
--- a/include/boost/core/lightweight_test.hpp
+++ b/include/boost/core/lightweight_test.hpp
@@ -20,7 +20,6 @@
 //
 
 #include <iterator>
-#include <sstream>
 #include <boost/assert.hpp>
 #include <boost/current_function.hpp>
 #include <boost/core/no_exceptions_support.hpp>
@@ -182,10 +181,11 @@ inline void test_cstr_ne_impl( char const * expr1, char const * expr2,
     }
 }
 
-template<class FwdIt1, class FwdIt2>
-void test_all_eq_impl(char const * file, int line, char const * function,
-                      FwdIt1 first_begin, FwdIt1 first_end,
-                      FwdIt2 second_begin, FwdIt2 second_end)
+template<class FormattedOutputFunction, class ForwardIterator1, class ForwardIterator2>
+void test_all_eq_impl(FormattedOutputFunction& output,
+                      char const * file, int line, char const * function,
+                      ForwardIterator1 first_begin, ForwardIterator1 first_end,
+                      ForwardIterator2 second_begin, ForwardIterator2 second_end)
 {
     if (std::distance(first_begin, first_end) != std::distance(second_begin, second_end))
     {
@@ -193,9 +193,9 @@ void test_all_eq_impl(char const * file, int line, char const * function,
     }
     else
     {
-        FwdIt1 first_it = first_begin;
-        FwdIt2 second_it = second_begin;
-        std::ostringstream indices;
+        ForwardIterator1 first_it = first_begin;
+        ForwardIterator2 second_it = second_begin;
+        bool first_iteration = true;
         do
         {
             while ((first_it != first_end) && (second_it != second_end) && (*first_it == *second_it))
@@ -208,13 +208,16 @@ void test_all_eq_impl(char const * file, int line, char const * function,
                 boost::detail::report_errors_remind();
                 return;
             }
-            indices << " [" << std::distance(first_begin, first_it) << "] '" << *first_it << "' != '" << *second_it << "'";
+            if (first_iteration)
+            {
+                first_iteration = true;
+                output << file << "(" << line << "): Container contents differ in function '" << function << "': mismatching indices";
+            }
+            output << " [" << std::distance(first_begin, first_it) << "] '" << *first_it << "' != '" << *second_it << "'";
             ++first_it;
             ++second_it;
         } while (first_it != first_end);
-        BOOST_LIGHTWEIGHT_TEST_OSTREAM
-            << file << "(" << line << "): Container contents differ in function '" << function << "': mismatching indices"
-            << indices.str() << std::endl;
+        output << std::endl;
         ++boost::detail::test_errors();
     }
 }
@@ -264,7 +267,7 @@ inline int report_errors()
 #define BOOST_TEST_CSTR_EQ(expr1,expr2) ( ::boost::detail::test_cstr_eq_impl(#expr1, #expr2, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, expr1, expr2) )
 #define BOOST_TEST_CSTR_NE(expr1,expr2) ( ::boost::detail::test_cstr_ne_impl(#expr1, #expr2, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, expr1, expr2) )
 
-#define BOOST_TEST_ALL_EQ(begin1, end1, begin2, end2) ( ::boost::detail::test_all_eq_impl(__FILE__, __LINE__, BOOST_CURRENT_FUNCTION, begin1, end1, begin2, end2) )
+#define BOOST_TEST_ALL_EQ(begin1, end1, begin2, end2) ( ::boost::detail::test_all_eq_impl(BOOST_LIGHTWEIGHT_TEST_OSTREAM, __FILE__, __LINE__, BOOST_CURRENT_FUNCTION, begin1, end1, begin2, end2) )
 
 #ifndef BOOST_NO_EXCEPTIONS
    #define BOOST_TEST_THROWS( EXPR, EXCEP )                    \