Work around compilation errors on clang-10 through 12.

This is also required for compliance with std::output_iterator concept.

.github/workflows/ci.yml

@@ -33,20 +33,6 @@ jobs:
       matrix:
         include:
           # Linux, gcc
-          - toolset: gcc-4.6
-            cxxstd: "0x"
-            os: ubuntu-latest
-            container: ubuntu:16.04
-            install:
-              - g++-4.6
-            sources:
-              - "ppa:ubuntu-toolchain-r/test"
-          - toolset: gcc-4.7
-            cxxstd: "11"
-            os: ubuntu-latest
-            container: ubuntu:16.04
-            install:
-              - g++-4.7
           - toolset: gcc-4.8
             cxxstd: "11"
             os: ubuntu-latest

appveyor.yml

@@ -15,9 +15,6 @@ branches:
 
 environment:
   matrix:
-    - TOOLSET: msvc-12.0
-      ADDRMD: 32,64
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
     - TOOLSET: msvc-14.0
       CXXSTD: 14,latest
       ADDRMD: 32,64

build.jam

@@ -0,0 +1,35 @@
+# Copyright René Ferdinand Rivera Morell 2023-2024
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+require-b2 5.2 ;
+
+constant boost_dependencies :
+    /boost/assert//boost_assert
+    /boost/concept_check//boost_concept_check
+    /boost/config//boost_config
+    /boost/core//boost_core
+    /boost/detail//boost_detail
+    /boost/function_types//boost_function_types
+    /boost/fusion//boost_fusion
+    /boost/mpl//boost_mpl
+    /boost/optional//boost_optional
+    /boost/smart_ptr//boost_smart_ptr
+    /boost/static_assert//boost_static_assert
+    /boost/type_traits//boost_type_traits
+    /boost/utility//boost_utility ;
+
+project /boost/iterator
+    : common-requirements
+        <include>include
+    ;
+
+explicit
+    [ alias boost_iterator : : : : <library>$(boost_dependencies) ]
+    [ alias all : boost_iterator test ]
+    ;
+
+call-if : boost-library iterator
+    ;
+

include/boost/iterator/function_output_iterator.hpp

@@ -11,6 +11,7 @@
 #ifndef BOOST_ITERATOR_FUNCTION_OUTPUT_ITERATOR_HPP
 #define BOOST_ITERATOR_FUNCTION_OUTPUT_ITERATOR_HPP
 
+#include <cstddef>
 #include <iterator>
 #include <boost/config.hpp>
 #include <boost/core/enable_if.hpp>
@@ -36,8 +37,8 @@ namespace iterators {
       template <class T>
       typename boost::disable_if_c<
         boost::is_same< typename boost::remove_cv< T >::type, output_proxy >::value,
-        output_proxy&
-      >::type operator=(const T& value) {
+        output_proxy const&
+      >::type operator=(const T& value) const {
         m_f(value);
         return *this;
       }
@@ -45,8 +46,8 @@ namespace iterators {
       template <class T>
       typename boost::disable_if_c<
         boost::is_same< typename boost::remove_cv< typename boost::remove_reference< T >::type >::type, output_proxy >::value,
-        output_proxy&
-      >::type operator=(T&& value) {
+        output_proxy const&
+      >::type operator=(T&& value) const {
         m_f(static_cast< T&& >(value));
         return *this;
       }
@@ -62,7 +63,7 @@ namespace iterators {
   public:
     typedef std::output_iterator_tag iterator_category;
     typedef void                value_type;
-    typedef void                difference_type;
+    typedef std::ptrdiff_t      difference_type;
     typedef void                pointer;
     typedef void                reference;
 

test/Jamfile.v2

@@ -2,6 +2,10 @@
 # Software License, Version 1.0. (See accompanying
 # file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
+import testing ;
+
+project : requirements <library>/boost/iterator//boost_iterator ;
+
 test-suite iterator
   :
     # These first two tests will run last, and are expected to fail
@@ -22,9 +26,9 @@ test-suite iterator
     [ run zip_iterator_test2_fusion_vector.cpp ]
     [ run zip_iterator_test2_fusion_list.cpp ]
 #    [ run zip_iterator_test2_fusion_deque.cpp ] // See bug report for fusion https://svn.boost.org/trac/boost/ticket/11572
-    [ run zip_iterator_test_fusion.cpp ]
-    [ run zip_iterator_test_std_tuple.cpp ]
-    [ run zip_iterator_test_std_pair.cpp ]
+    [ run zip_iterator_test_fusion.cpp : : : <library>/boost/assign//boost_assign ]
+    [ run zip_iterator_test_std_tuple.cpp : : : <library>/boost/assign//boost_assign ]
+    [ run zip_iterator_test_std_pair.cpp : : : <library>/boost/assign//boost_assign ]
 
     [ run is_iterator.cpp ]
 
@@ -61,10 +65,10 @@ test-suite iterator
     [ compile-fail minimum_category_compile_fail.cpp ]
 
     [ run next_prior_test.cpp ]
-    [ run advance_test.cpp ]
-    [ run distance_test.cpp ]
-    [ compile adl_test.cpp ]
-    [ compile range_distance_compat_test.cpp ]
+    [ run advance_test.cpp : : : <library>/boost/container//boost_container ]
+    [ run distance_test.cpp : : : <library>/boost/container//boost_container ]
+    [ compile adl_test.cpp : <library>/boost/array//boost_array ]
+    [ compile range_distance_compat_test.cpp : <library>/boost/range//boost_range ]
 
     [ run shared_iterator_test.cpp ]
 ;

test/function_output_iterator_test.cpp

@@ -8,6 +8,8 @@
 #include <boost/core/lightweight_test.hpp>
 #include <boost/iterator/function_output_iterator.hpp>
 
+#include <iterator>
+
 namespace {
 
 struct sum_func
@@ -57,5 +59,12 @@ int main()
     }
 #endif
 
+#if defined(__cpp_lib_concepts) && ( __cpp_lib_concepts >= 202002L )
+    {
+        auto func = [](int) {};
+        static_assert(std::output_iterator< boost::iterators::function_output_iterator< decltype(func) >, int >);
+    }
+#endif
+
     return boost::report_errors();
 }