Remove windows-2019 from GHA

Enable C++20 constexpr for intrusive_ptr

.drone.jsonnet

@@ -179,22 +179,22 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 23.04 GCC 13 32 ASAN",
+        "Linux 24.04 GCC 13 32 ASAN",
-        "cppalliance/droneubuntu2304:1",
+        "cppalliance/droneubuntu2404:1",
         { TOOLSET: 'gcc', COMPILER: 'g++-13', CXXSTD: '11,14,17,20,2b', ADDRMD: '32' } + asan,
         "g++-13-multilib",
     ),
 
     linux_pipeline(
-        "Linux 23.04 GCC 13 32 UBSAN",
+        "Linux 24.04 GCC 13 32 UBSAN",
-        "cppalliance/droneubuntu2304:1",
+        "cppalliance/droneubuntu2404:1",
         { TOOLSET: 'gcc', COMPILER: 'g++-13', CXXSTD: '11,14,17,20,2b', ADDRMD: '32' } + ubsan,
         "g++-13-multilib",
     ),
 
     linux_pipeline(
-        "Linux 23.04 GCC 13 64 UBSAN",
+        "Linux 24.04 GCC 13 64 UBSAN",
-        "cppalliance/droneubuntu2304:1",
+        "cppalliance/droneubuntu2404:1",
         { TOOLSET: 'gcc', COMPILER: 'g++-13', CXXSTD: '11,14,17,20,2b', ADDRMD: '64' } + ubsan,
         "g++-13-multilib",
     ),
@@ -333,22 +333,22 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 23.04 Clang 16",
+        "Linux 24.04 Clang 16",
-        "cppalliance/droneubuntu2304:1",
+        "cppalliance/droneubuntu2404:1",
         { TOOLSET: 'clang', COMPILER: 'clang++-16', CXXSTD: '11,14,17,20,2b' },
         "clang-16",
     ),
 
     linux_pipeline(
-        "Linux 23.10 Clang 17 UBSAN",
+        "Linux 24.04 Clang 17 UBSAN",
-        "cppalliance/droneubuntu2310:1",
+        "cppalliance/droneubuntu2404:1",
         { TOOLSET: 'clang', COMPILER: 'clang++-17', CXXSTD: '11,14,17,20,2b' } + ubsan,
         "clang-17",
     ),
 
     linux_pipeline(
-        "Linux 23.10 Clang 17 ASAN",
+        "Linux 24.04 Clang 17 ASAN",
-        "cppalliance/droneubuntu2310:1",
+        "cppalliance/droneubuntu2404:1",
         { TOOLSET: 'clang', COMPILER: 'clang++-17', CXXSTD: '11,14,17,20,2b' } + asan,
         "clang-17",
     ),
@@ -367,6 +367,13 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
         "clang-18",
     ),
 
+    linux_pipeline(
+        "Linux 24.10 Clang 19",
+        "cppalliance/droneubuntu2410:1",
+        { TOOLSET: 'clang', COMPILER: 'clang++-19', CXXSTD: '11,14,17,20,2b' },
+        "clang-19",
+    ),
+
     macos_pipeline(
         "MacOS 10.15 Xcode 12.2 UBSAN",
         { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '11,14,1z' } + ubsan,

.github/workflows/ci.yml

@@ -19,41 +19,44 @@ jobs:
         include:
           - toolset: gcc-4.8
             cxxstd: "11"
-            os: ubuntu-latest
             container: ubuntu:18.04
+            os: ubuntu-latest
             install: g++-4.8-multilib
             address-model: 32,64
           - toolset: gcc-5
             cxxstd: "11,14,1z"
-            os: ubuntu-latest
             container: ubuntu:18.04
+            os: ubuntu-latest
             install: g++-5-multilib
             address-model: 32,64
           - toolset: gcc-6
             cxxstd: "11,14,1z"
-            os: ubuntu-latest
             container: ubuntu:18.04
+            os: ubuntu-latest
             install: g++-6-multilib
             address-model: 32,64
           - toolset: gcc-7
             cxxstd: "11,14,17"
-            os: ubuntu-latest
             container: ubuntu:18.04
+            os: ubuntu-latest
             install: g++-7-multilib
             address-model: 32,64
           - toolset: gcc-8
             cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
+            container: ubuntu:20.04
+            os: ubuntu-latest
             install: g++-8-multilib
             address-model: 32,64
           - toolset: gcc-9
             cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
+            container: ubuntu:20.04
+            os: ubuntu-latest
             install: g++-9-multilib
             address-model: 32,64
           - toolset: gcc-10
             cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
+            container: ubuntu:20.04
+            os: ubuntu-latest
             install: g++-10-multilib
             address-model: 32,64
           - toolset: gcc-11
@@ -69,65 +72,81 @@ jobs:
           - toolset: gcc-13
             cxxstd: "11,14,17,20,2b"
             os: ubuntu-latest
-            container: ubuntu:23.04
+            container: ubuntu:24.04
             install: g++-13-multilib
             address-model: 32,64
           - toolset: gcc-14
-            cxxstd: "11,14,17,20,2b"
+            cxxstd: "11,14,17,20,23,2c"
             os: ubuntu-latest
             container: ubuntu:24.04
             install: g++-14-multilib
             address-model: 32,64
+          - toolset: gcc-15
+            cxxstd: "11,14,17,20,23,2c"
+            os: ubuntu-latest
+            container: ubuntu:25.04
+            install: g++-15-multilib
+            address-model: 32,64
           - toolset: clang
             compiler: clang++-3.9
             cxxstd: "11,14"
-            os: ubuntu-latest
             container: ubuntu:18.04
+            os: ubuntu-latest
             install: clang-3.9
           - toolset: clang
             compiler: clang++-4.0
             cxxstd: "11,14"
-            os: ubuntu-latest
             container: ubuntu:18.04
+            os: ubuntu-latest
             install: clang-4.0
           - toolset: clang
             compiler: clang++-5.0
             cxxstd: "11,14,1z"
-            os: ubuntu-latest
             container: ubuntu:18.04
+            os: ubuntu-latest
             install: clang-5.0
           - toolset: clang
             compiler: clang++-6.0
             cxxstd: "11,14,17"
-            os: ubuntu-20.04
+            container: ubuntu:20.04
+            os: ubuntu-latest
             install: clang-6.0
           - toolset: clang
             compiler: clang++-7
             cxxstd: "11,14,17"
-            os: ubuntu-20.04
+            container: ubuntu:20.04
+            os: ubuntu-latest
             install: clang-7
           - toolset: clang
             compiler: clang++-8
             cxxstd: "11,14,17"
-            os: ubuntu-20.04
+            container: ubuntu:20.04
+            os: ubuntu-latest
             install: clang-8
           - toolset: clang
             compiler: clang++-9
             cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
+            container: ubuntu:20.04
+            os: ubuntu-latest
             install: clang-9
           - toolset: clang
             compiler: clang++-10
             cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
+            container: ubuntu:20.04
+            os: ubuntu-latest
+            install: clang-10
           - toolset: clang
             compiler: clang++-11
             cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
+            container: ubuntu:20.04
+            os: ubuntu-latest
+            install: clang-11
           - toolset: clang
             compiler: clang++-12
             cxxstd: "11,14,17,20"
-            os: ubuntu-20.04
+            container: ubuntu:20.04
+            os: ubuntu-latest
+            install: clang-12
           - toolset: clang
             compiler: clang++-13
             cxxstd: "11,14,17,20,2b"
@@ -149,13 +168,13 @@ jobs:
           - toolset: clang
             compiler: clang++-16
             cxxstd: "11,14,17,20,2b"
-            container: ubuntu:23.04
+            container: ubuntu:24.04
             os: ubuntu-latest
             install: clang-16
           - toolset: clang
             compiler: clang++-17
             cxxstd: "11,14,17,20,2b"
-            container: ubuntu:23.10
+            container: ubuntu:24.04
             os: ubuntu-latest
             install: clang-17
           - toolset: clang
@@ -164,6 +183,18 @@ jobs:
             container: ubuntu:24.04
             os: ubuntu-latest
             install: clang-18
+          - toolset: clang
+            compiler: clang++-19
+            cxxstd: "11,14,17,20,23,2c"
+            container: ubuntu:24.04
+            os: ubuntu-latest
+            install: clang-19
+          - toolset: clang
+            compiler: clang++-20
+            cxxstd: "11,14,17,20,23,2c"
+            container: ubuntu:25.04
+            os: ubuntu-latest
+            install: clang-20
           - toolset: clang
             cxxstd: "11,14,17,20,2b"
             os: macos-13
@@ -175,24 +206,32 @@ jobs:
             os: macos-15
 
     runs-on: ${{matrix.os}}
-    container: ${{matrix.container}}
+
+    container:
+      image: ${{matrix.container}}
+      volumes:
+        - /node20217:/node20217:rw,rshared
+        - ${{ startsWith(matrix.container, 'ubuntu:1') && '/node20217:/__e/node20:ro,rshared' || ' ' }}
 
     defaults:
       run:
         shell: bash
 
     steps:
-      - name: Enable Node 16
-        run: |
-          echo "ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true" >> $GITHUB_ENV
-
-      - uses: actions/checkout@v3
-
       - name: Setup container environment
         if: matrix.container
         run: |
           apt-get update
-          apt-get -y install sudo python3 git g++
+          apt-get -y install sudo python3 git g++ curl xz-utils
+
+      - name: Install nodejs20glibc2.17
+        if: ${{ startsWith( matrix.container, 'ubuntu:1' ) }}
+        run: |
+          curl -LO https://archives.boost.io/misc/node/node-v20.9.0-linux-x64-glibc-217.tar.xz
+          tar -xf node-v20.9.0-linux-x64-glibc-217.tar.xz --strip-components 1 -C /node20217
+          ldd /__e/node20/bin/node
+
+      - uses: actions/checkout@v4
 
       - name: Install packages
         if: matrix.install
@@ -237,14 +276,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - toolset: msvc-14.0
-            cxxstd: 14,latest
-            addrmd: 32,64
-            os: windows-2019
-          - toolset: msvc-14.2
-            cxxstd: "14,17,20,latest"
-            addrmd: 32,64
-            os: windows-2019
           - toolset: msvc-14.3
             cxxstd: "14,17,20,latest"
             addrmd: 32,64
@@ -256,7 +287,7 @@ jobs:
           - toolset: gcc
             cxxstd: "11,14,17,2a"
             addrmd: 64
-            os: windows-2019
+            os: windows-2022
 
     runs-on: ${{matrix.os}}
 
@@ -296,7 +327,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-20.04
           - os: ubuntu-22.04
           - os: ubuntu-24.04
           - os: macos-13
@@ -345,7 +375,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-20.04
           - os: ubuntu-22.04
           - os: ubuntu-24.04
           - os: macos-13
@@ -404,7 +433,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-20.04
           - os: ubuntu-22.04
           - os: ubuntu-24.04
           - os: macos-13
@@ -461,8 +489,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: windows-2019
+          - os: windows-latest
-          - os: windows-2022
 
     runs-on: ${{matrix.os}}
 
@@ -510,8 +537,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: windows-2019
+          - os: windows-latest
-          - os: windows-2022
 
     runs-on: ${{matrix.os}}
 
@@ -577,8 +603,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: windows-2019
+          - os: windows-latest
-          - os: windows-2022
 
     runs-on: ${{matrix.os}}
 

appveyor.yml

@@ -21,6 +21,22 @@ environment:
       TOOLSET: msvc-14.1
       CXXSTD: 14,17
       ADDRMD: 32,64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      TOOLSET: msvc-14.2
+      CXXSTD: 14
+      ADDRMD: 32,64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      TOOLSET: msvc-14.2
+      CXXSTD: 17
+      ADDRMD: 32,64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      TOOLSET: msvc-14.2
+      CXXSTD: 20
+      ADDRMD: 32,64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      TOOLSET: msvc-14.2
+      CXXSTD: latest
+      ADDRMD: 32,64
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       TOOLSET: clang-win
       CXXSTD: 14,17,latest
@@ -33,14 +49,14 @@ environment:
       ADDPATH: C:\cygwin64\bin;
       TOOLSET: gcc
       CXXSTD: 11,14,1z
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
-      ADDPATH: C:\mingw\bin;
+      ADDPATH: C:\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin;
       TOOLSET: gcc
-      CXXSTD: 11,14,1z
+      CXXSTD: 11,14,17
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
-      ADDPATH: C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin;
+      ADDPATH: C:\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin;
       TOOLSET: gcc
-      CXXSTD: 11,14,1z
+      CXXSTD: 11,14,17
 
 install:
   - set BOOST_BRANCH=develop

doc/smart_ptr/changelog.adoc

@@ -1,5 +1,5 @@
 ////
-Copyright 2019, 2020 Peter Dimov
+Copyright 2019-2025 Peter Dimov
 
 Distributed under the Boost Software License, Version 1.0.
 
@@ -13,6 +13,10 @@ http://www.boost.org/LICENSE_1_0.txt
 :toc-title:
 :idprefix: changelog_
 
+## Changes in 1.88.0
+
+* Fix `operator<<` for wide streams (accidentally broken in 1.87.0)
+
 ## Changes in 1.87.0
 
 * {cpp}03 is no longer supported, a {cpp}11 compiler is required.

include/boost/smart_ptr/detail/lightweight_thread.hpp

@@ -104,7 +104,7 @@ public:
 
 #if defined( BOOST_HAS_PTHREADS )
 
-extern "C" void * lw_thread_routine( void * pv )
+extern "C" inline void * lw_thread_routine( void * pv )
 {
     std::unique_ptr<lw_abstract_thread> pt( static_cast<lw_abstract_thread *>( pv ) );
 
@@ -115,7 +115,7 @@ extern "C" void * lw_thread_routine( void * pv )
 
 #else
 
-unsigned __stdcall lw_thread_routine( void * pv )
+inline unsigned __stdcall lw_thread_routine( void * pv )
 {
     std::unique_ptr<lw_abstract_thread> pt( static_cast<lw_abstract_thread *>( pv ) );
 

include/boost/smart_ptr/detail/sp_cxx20_constexpr.hpp

@@ -0,0 +1,37 @@
+#ifndef BOOST_SMART_PTR_DETAIL_SP_CXX20_CONSTEXPR_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_CXX20_CONSTEXPR_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+#pragma once
+#endif
+
+//  detail/sp_noexcept.hpp
+//
+//  Copyright 2025 Mathias Stearn
+//
+//  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
+
+
+// This macro is used to mark functions as constexpr if the compiler supports
+// constexpr destructors. Since you can't have a constexpr smart pointer object,
+// everything except null constructors are guided behind this macro. Because
+// this also guards a use of dynamic_cast, we need to check for its availability
+// as well. It isn't worth splitting out since all known compilers that support
+// constexpr dynamic_cast also support constexpr destructors.
+//
+// WARNING: This does not check for changing active member of a union in
+// constant expressions which is allowed in C++20. If that is needed, we
+// need to raise the checked version to 202002L.
+#if defined(__cpp_constexpr_dynamic_alloc) && __cpp_constexpr_dynamic_alloc >= 201907L \
+    && defined(__cpp_constexpr) && __cpp_constexpr >= 201907L
+#define BOOST_SP_CXX20_CONSTEXPR constexpr
+#else
+#define BOOST_SP_CXX20_CONSTEXPR
+#define BOOST_SP_NO_CXX20_CONSTEXPR
+#endif
+
+#endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_CXX20_CONSTEXPR_HPP_INCLUDED

include/boost/smart_ptr/intrusive_ptr.hpp

@@ -13,6 +13,7 @@
 //  See http://www.boost.org/libs/smart_ptr/ for documentation.
 //
 
+#include <boost/smart_ptr/detail/sp_cxx20_constexpr.hpp>
 #include <boost/smart_ptr/detail/sp_convertible.hpp>
 #include <boost/smart_ptr/detail/sp_noexcept.hpp>
 #include <boost/assert.hpp>
@@ -53,29 +54,29 @@ public:
     {
     }
 
-    intrusive_ptr( T * p, bool add_ref = true ): px( p )
+    BOOST_SP_CXX20_CONSTEXPR intrusive_ptr( T * p, bool add_ref = true ): px( p )
     {
         if( px != 0 && add_ref ) intrusive_ptr_add_ref( px );
     }
 
     template<class U>
-    intrusive_ptr( intrusive_ptr<U> const & rhs, typename boost::detail::sp_enable_if_convertible<U,T>::type = boost::detail::sp_empty() )
+    BOOST_SP_CXX20_CONSTEXPR intrusive_ptr( intrusive_ptr<U> const & rhs, typename boost::detail::sp_enable_if_convertible<U,T>::type = boost::detail::sp_empty() )
     : px( rhs.get() )
     {
         if( px != 0 ) intrusive_ptr_add_ref( px );
     }
 
-    intrusive_ptr(intrusive_ptr const & rhs): px( rhs.px )
+    BOOST_SP_CXX20_CONSTEXPR intrusive_ptr(intrusive_ptr const & rhs): px( rhs.px )
     {
         if( px != 0 ) intrusive_ptr_add_ref( px );
     }
 
-    ~intrusive_ptr()
+    BOOST_SP_CXX20_CONSTEXPR ~intrusive_ptr()
     {
         if( px != 0 ) intrusive_ptr_release( px );
     }
 
-    template<class U> intrusive_ptr & operator=(intrusive_ptr<U> const & rhs)
+    template<class U> BOOST_SP_CXX20_CONSTEXPR intrusive_ptr & operator=(intrusive_ptr<U> const & rhs)
     {
         this_type(rhs).swap(*this);
         return *this;
@@ -83,12 +84,12 @@ public:
 
 // Move support
 
-    intrusive_ptr(intrusive_ptr && rhs) noexcept : px( rhs.px )
+    BOOST_SP_CXX20_CONSTEXPR intrusive_ptr(intrusive_ptr && rhs) noexcept : px( rhs.px )
     {
         rhs.px = 0;
     }
 
-    intrusive_ptr & operator=(intrusive_ptr && rhs) noexcept
+    BOOST_SP_CXX20_CONSTEXPR intrusive_ptr & operator=(intrusive_ptr && rhs) noexcept
     {
         this_type( static_cast< intrusive_ptr && >( rhs ) ).swap(*this);
         return *this;
@@ -97,76 +98,76 @@ public:
     template<class U> friend class intrusive_ptr;
 
     template<class U>
-    intrusive_ptr(intrusive_ptr<U> && rhs, typename boost::detail::sp_enable_if_convertible<U,T>::type = boost::detail::sp_empty())
+    BOOST_SP_CXX20_CONSTEXPR intrusive_ptr(intrusive_ptr<U> && rhs, typename boost::detail::sp_enable_if_convertible<U,T>::type = boost::detail::sp_empty())
     : px( rhs.px )
     {
         rhs.px = 0;
     }
 
     template<class U>
-    intrusive_ptr & operator=(intrusive_ptr<U> && rhs) noexcept
+    BOOST_SP_CXX20_CONSTEXPR intrusive_ptr & operator=(intrusive_ptr<U> && rhs) noexcept
     {
         this_type( static_cast< intrusive_ptr<U> && >( rhs ) ).swap(*this);
         return *this;
     }
 
-    intrusive_ptr & operator=(intrusive_ptr const & rhs)
+    BOOST_SP_CXX20_CONSTEXPR intrusive_ptr & operator=(intrusive_ptr const & rhs)
     {
         this_type(rhs).swap(*this);
         return *this;
     }
 
-    intrusive_ptr & operator=(T * rhs)
+    BOOST_SP_CXX20_CONSTEXPR intrusive_ptr & operator=(T * rhs)
     {
         this_type(rhs).swap(*this);
         return *this;
     }
 
-    void reset()
+    BOOST_SP_CXX20_CONSTEXPR void reset()
     {
         this_type().swap( *this );
     }
 
-    void reset( T * rhs )
+    BOOST_SP_CXX20_CONSTEXPR void reset( T * rhs )
     {
         this_type( rhs ).swap( *this );
     }
 
-    void reset( T * rhs, bool add_ref )
+    BOOST_SP_CXX20_CONSTEXPR void reset( T * rhs, bool add_ref )
     {
         this_type( rhs, add_ref ).swap( *this );
     }
 
-    T * get() const noexcept
+    BOOST_SP_CXX20_CONSTEXPR T * get() const noexcept
     {
         return px;
     }
 
-    T * detach() noexcept
+    BOOST_SP_CXX20_CONSTEXPR T * detach() noexcept
     {
         T * ret = px;
         px = 0;
         return ret;
     }
 
-    T & operator*() const BOOST_SP_NOEXCEPT_WITH_ASSERT
+    BOOST_SP_CXX20_CONSTEXPR T & operator*() const BOOST_SP_NOEXCEPT_WITH_ASSERT
     {
         BOOST_ASSERT( px != 0 );
         return *px;
     }
 
-    T * operator->() const BOOST_SP_NOEXCEPT_WITH_ASSERT
+    BOOST_SP_CXX20_CONSTEXPR T * operator->() const BOOST_SP_NOEXCEPT_WITH_ASSERT
     {
         BOOST_ASSERT( px != 0 );
         return px;
     }
 
-    explicit operator bool () const noexcept
+    BOOST_SP_CXX20_CONSTEXPR explicit operator bool () const noexcept
     {
         return px != 0;
     }
 
-    void swap(intrusive_ptr & rhs) noexcept
+    BOOST_SP_CXX20_CONSTEXPR void swap(intrusive_ptr & rhs) noexcept
     {
         T * tmp = px;
         px = rhs.px;
@@ -178,101 +179,101 @@ private:
     T * px;
 };
 
-template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b) noexcept
+template<class T, class U> BOOST_SP_CXX20_CONSTEXPR inline bool operator==(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b) noexcept
 {
     return a.get() == b.get();
 }
 
-template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b) noexcept
+template<class T, class U> BOOST_SP_CXX20_CONSTEXPR inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b) noexcept
 {
     return a.get() != b.get();
 }
 
-template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, U * b) noexcept
+template<class T, class U> BOOST_SP_CXX20_CONSTEXPR inline bool operator==(intrusive_ptr<T> const & a, U * b) noexcept
 {
     return a.get() == b;
 }
 
-template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, U * b) noexcept
+template<class T, class U> BOOST_SP_CXX20_CONSTEXPR inline bool operator!=(intrusive_ptr<T> const & a, U * b) noexcept
 {
     return a.get() != b;
 }
 
-template<class T, class U> inline bool operator==(T * a, intrusive_ptr<U> const & b) noexcept
+template<class T, class U> BOOST_SP_CXX20_CONSTEXPR inline bool operator==(T * a, intrusive_ptr<U> const & b) noexcept
 {
     return a == b.get();
 }
 
-template<class T, class U> inline bool operator!=(T * a, intrusive_ptr<U> const & b) noexcept
+template<class T, class U> BOOST_SP_CXX20_CONSTEXPR inline bool operator!=(T * a, intrusive_ptr<U> const & b) noexcept
 {
     return a != b.get();
 }
 
-template<class T> inline bool operator==( intrusive_ptr<T> const & p, std::nullptr_t ) noexcept
+template<class T> BOOST_SP_CXX20_CONSTEXPR inline bool operator==( intrusive_ptr<T> const & p, std::nullptr_t ) noexcept
 {
     return p.get() == 0;
 }
 
-template<class T> inline bool operator==( std::nullptr_t, intrusive_ptr<T> const & p ) noexcept
+template<class T> BOOST_SP_CXX20_CONSTEXPR inline bool operator==( std::nullptr_t, intrusive_ptr<T> const & p ) noexcept
 {
     return p.get() == 0;
 }
 
-template<class T> inline bool operator!=( intrusive_ptr<T> const & p, std::nullptr_t ) noexcept
+template<class T> BOOST_SP_CXX20_CONSTEXPR inline bool operator!=( intrusive_ptr<T> const & p, std::nullptr_t ) noexcept
 {
     return p.get() != 0;
 }
 
-template<class T> inline bool operator!=( std::nullptr_t, intrusive_ptr<T> const & p ) noexcept
+template<class T> BOOST_SP_CXX20_CONSTEXPR inline bool operator!=( std::nullptr_t, intrusive_ptr<T> const & p ) noexcept
 {
     return p.get() != 0;
 }
 
-template<class T> inline bool operator<(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b) noexcept
+template<class T> BOOST_SP_CXX20_CONSTEXPR inline bool operator<(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b) noexcept
 {
     return std::less<T *>()(a.get(), b.get());
 }
 
-template<class T> void swap(intrusive_ptr<T> & lhs, intrusive_ptr<T> & rhs) noexcept
+template<class T> BOOST_SP_CXX20_CONSTEXPR inline void swap(intrusive_ptr<T> & lhs, intrusive_ptr<T> & rhs) noexcept
 {
     lhs.swap(rhs);
 }
 
 // mem_fn support
 
-template<class T> T * get_pointer(intrusive_ptr<T> const & p) noexcept
+template<class T> BOOST_SP_CXX20_CONSTEXPR inline T * get_pointer(intrusive_ptr<T> const & p) noexcept
 {
     return p.get();
 }
 
 // pointer casts
 
-template<class T, class U> intrusive_ptr<T> static_pointer_cast(intrusive_ptr<U> const & p)
+template<class T, class U> BOOST_SP_CXX20_CONSTEXPR inline intrusive_ptr<T> static_pointer_cast(intrusive_ptr<U> const & p)
 {
     return static_cast<T *>(p.get());
 }
 
-template<class T, class U> intrusive_ptr<T> const_pointer_cast(intrusive_ptr<U> const & p)
+template<class T, class U> BOOST_SP_CXX20_CONSTEXPR inline intrusive_ptr<T> const_pointer_cast(intrusive_ptr<U> const & p)
 {
     return const_cast<T *>(p.get());
 }
 
-template<class T, class U> intrusive_ptr<T> dynamic_pointer_cast(intrusive_ptr<U> const & p)
+template<class T, class U> BOOST_SP_CXX20_CONSTEXPR inline intrusive_ptr<T> dynamic_pointer_cast(intrusive_ptr<U> const & p)
 {
     return dynamic_cast<T *>(p.get());
 }
 
-template<class T, class U> intrusive_ptr<T> static_pointer_cast( intrusive_ptr<U> && p ) noexcept
+template<class T, class U> BOOST_SP_CXX20_CONSTEXPR inline intrusive_ptr<T> static_pointer_cast( intrusive_ptr<U> && p ) noexcept
 {
     return intrusive_ptr<T>( static_cast<T*>( p.detach() ), false );
 }
 
-template<class T, class U> intrusive_ptr<T> const_pointer_cast( intrusive_ptr<U> && p ) noexcept
+template<class T, class U> BOOST_SP_CXX20_CONSTEXPR inline intrusive_ptr<T> const_pointer_cast( intrusive_ptr<U> && p ) noexcept
 {
     return intrusive_ptr<T>( const_cast<T*>( p.detach() ), false );
 }
 
-template<class T, class U> intrusive_ptr<T> dynamic_pointer_cast( intrusive_ptr<U> && p ) noexcept
+template<class T, class U> BOOST_SP_CXX20_CONSTEXPR inline intrusive_ptr<T> dynamic_pointer_cast( intrusive_ptr<U> && p ) noexcept
 {
     T * p2 = dynamic_cast<T*>( p.get() );
 
@@ -285,7 +286,7 @@ template<class T, class U> intrusive_ptr<T> dynamic_pointer_cast( intrusive_ptr<
 
 // operator<<
 
-template<class Y> std::ostream & operator<< (std::ostream & os, intrusive_ptr<Y> const & p)
+template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, intrusive_ptr<Y> const & p)
 {
     os << p.get();
     return os;

include/boost/smart_ptr/shared_ptr.hpp

@@ -775,7 +775,7 @@ template<class T> inline typename shared_ptr<T>::element_type * get_pointer(shar
 
 // operator<<
 
-template<class Y> std::ostream & operator<< (std::ostream & os, shared_ptr<Y> const & p)
+template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, shared_ptr<Y> const & p)
 {
     os << p.get();
     return os;

test/Jamfile

@@ -245,6 +245,7 @@ run atomic_sp_test.cpp ;
 
 run sp_constexpr_test.cpp ;
 run sp_constexpr_test2.cpp ;
+compile ip_constexpr_test.cpp ;
 
 run atomic_sp_constexpr_test.cpp ;
 
@@ -424,3 +425,7 @@ run sp_is_bounded_array_test.cpp ;
 run sp_is_unbounded_array_test.cpp ;
 run sp_type_identity_test.cpp ;
 run sp_type_with_alignment_test.cpp ;
+
+run sp_ostream_test.cpp ;
+run ip_ostream_test.cpp ;
+run lsp_ostream_test.cpp ;

test/ip_constexpr_test.cpp

@@ -0,0 +1,133 @@
+//
+// ip_constexpr_test.cpp
+//
+// Copyright 2025 Mathias Stearn
+//
+// 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
+//
+
+#include <boost/intrusive_ptr.hpp>
+
+#ifndef BOOST_SP_NO_CXX20_CONSTEXPR
+
+struct dummy {
+    // no-ops, so safe on pointers to static constexpr variables
+    friend constexpr void intrusive_ptr_add_ref(const dummy *) {}
+    friend constexpr void intrusive_ptr_release(const dummy *) {}
+};
+static constexpr dummy d;
+
+struct subdummy : dummy {};
+
+// Test that basic operations work at compile time.
+static_assert(bool(boost::intrusive_ptr<const dummy>(&d)));
+static_assert(!bool(boost::intrusive_ptr<dummy>(nullptr)));
+static_assert(!bool(boost::intrusive_ptr<dummy>()));
+static_assert(!bool(boost::intrusive_ptr<dummy>(boost::intrusive_ptr<subdummy>())));
+static_assert(&*boost::intrusive_ptr<const dummy>(&d) == &d);
+static_assert(boost::intrusive_ptr<const dummy>(&d).operator->() == &d);
+static_assert(boost::intrusive_ptr<dummy>() == nullptr);
+static_assert(boost::intrusive_ptr<dummy>() == boost::intrusive_ptr<dummy>(nullptr));
+static_assert(boost::intrusive_ptr<dummy>() != boost::intrusive_ptr<const dummy>(&d));
+static_assert(boost::intrusive_ptr<const dummy>(&d) != nullptr);
+static_assert(boost::intrusive_ptr<const dummy>(&d) == boost::intrusive_ptr<const dummy>(&d));
+static_assert(boost::intrusive_ptr<const dummy>(&d) == boost::intrusive_ptr<const dummy>(&d).get());
+static_assert(boost::intrusive_ptr<const dummy>(&d) == boost::intrusive_ptr<const dummy>(&d).detach());
+static_assert(!(boost::intrusive_ptr<const dummy>(&d) < boost::intrusive_ptr<const dummy>(&d)));
+static_assert(boost::get_pointer(boost::intrusive_ptr<const dummy>(&d)) == &d);
+static_assert(boost::static_pointer_cast<const dummy>( boost::intrusive_ptr<const dummy>(&d)) == &d);
+static_assert(boost::const_pointer_cast<const dummy>( boost::intrusive_ptr<const dummy>(&d)) == &d);
+static_assert(boost::dynamic_pointer_cast<const dummy>( boost::intrusive_ptr<const dummy>(&d)) == &d);
+
+constexpr auto lvalue = boost::intrusive_ptr<const dummy>(&d);
+constexpr auto lvalue_convertible = boost::intrusive_ptr<const subdummy>();
+static_assert(boost::intrusive_ptr<const dummy>(lvalue) == &d);
+static_assert(!boost::intrusive_ptr<const dummy>(lvalue_convertible));
+static_assert(boost::static_pointer_cast<const dummy>(lvalue) == &d);
+static_assert(boost::const_pointer_cast<const dummy>(lvalue) == &d);
+static_assert(boost::dynamic_pointer_cast<const dummy>(lvalue) == &d);
+
+// Works in places that static_assert doesn't, like expressions with
+// non-constexpr variables in constexpr functions.
+template <typename T> constexpr void semi_static_assert(T b) {
+    if (!b)
+        throw "assertion failed"; // Not constexpr so fails compile.
+}
+
+constexpr bool test_swap() {
+    auto p1 = boost::intrusive_ptr<const dummy>(&d);
+    auto p2 = boost::intrusive_ptr<const dummy>();
+    swap(p1, p2);
+    semi_static_assert(!p1 && p2);
+    p1.swap(p2);
+    semi_static_assert(p1 && !p2);
+    return true;
+}
+static_assert(test_swap());
+
+constexpr bool test_reset_assign() {
+    // Test assignments resulting in nullptr
+    {
+        auto p1 = boost::intrusive_ptr<const dummy>(&d);
+        p1.reset();
+        semi_static_assert(!p1);
+    }
+    {
+        auto p1 = boost::intrusive_ptr<const dummy>(&d);
+        p1.reset(nullptr);
+        semi_static_assert(!p1);
+    }
+    {
+        auto p1 = boost::intrusive_ptr<const dummy>(&d);
+        p1 = nullptr;
+        semi_static_assert(!p1);
+    }
+    {
+        auto p1 = boost::intrusive_ptr<const dummy>(&d);
+        p1 = boost::intrusive_ptr<const dummy>();
+        semi_static_assert(!p1);
+    }
+    {
+        auto p1 = boost::intrusive_ptr<const dummy>(&d);
+        p1 = boost::intrusive_ptr<subdummy>();
+        semi_static_assert(!p1);
+    }
+    {
+        auto p1 = boost::intrusive_ptr<const dummy>(&d);
+        p1 = lvalue_convertible;
+        semi_static_assert(!p1);
+    }
+
+    // Test assignments resulting in &d
+    {
+        auto p1 = boost::intrusive_ptr<const dummy>();
+        p1.reset(&d);
+        semi_static_assert(p1 == &d);
+    }
+    {
+        auto p1 = boost::intrusive_ptr<const dummy>();
+        p1.reset(&d, true);
+        semi_static_assert(p1 == &d);
+    }
+    {
+        auto p1 = boost::intrusive_ptr<const dummy>();
+        p1 = boost::intrusive_ptr<const dummy>(&d);
+        semi_static_assert(p1 == &d);
+    }
+    {
+        auto p1 = boost::intrusive_ptr<const dummy>();
+        p1 = lvalue;
+        semi_static_assert(p1 == &d);
+    }
+    {
+        auto p1 = boost::intrusive_ptr<const dummy>();
+        p1 = &d;
+        semi_static_assert(p1 == &d);
+    }
+    return true;
+}
+static_assert(test_reset_assign());
+
+#endif

test/ip_ostream_test.cpp

@@ -0,0 +1,75 @@
+// Copyright 2011, 2025 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/intrusive_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <sstream>
+
+class base
+{
+private:
+
+    int use_count_;
+
+    base(base const &);
+    base & operator=(base const &);
+
+protected:
+
+    base(): use_count_(0)
+    {
+    }
+
+    virtual ~base()
+    {
+    }
+
+public:
+
+    long use_count() const
+    {
+        return use_count_;
+    }
+
+    inline friend void intrusive_ptr_add_ref(base * p)
+    {
+        ++p->use_count_;
+    }
+
+    inline friend void intrusive_ptr_release(base * p)
+    {
+        if(--p->use_count_ == 0) delete p;
+    }
+};
+
+struct X: public base
+{
+};
+
+template<class T> std::string to_string( T const& t )
+{
+    std::ostringstream os;
+    os << t;
+    return os.str();
+}
+
+template<class T> std::wstring to_wstring( T const& t )
+{
+    std::wostringstream os;
+    os << t;
+    return os.str();
+}
+
+int main()
+{
+    boost::intrusive_ptr<X> p1, p2( new X );
+
+    BOOST_TEST_EQ( to_string( p1 ), to_string( p1.get() ) );
+    BOOST_TEST_EQ( to_string( p2 ), to_string( p2.get() ) );
+
+    BOOST_TEST( to_wstring( p1 ) == to_wstring( p1.get() ) );
+    BOOST_TEST( to_wstring( p2 ) == to_wstring( p2.get() ) );
+
+    return boost::report_errors();
+}

test/lsp_ostream_test.cpp

@@ -0,0 +1,34 @@
+// Copyright 2025 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/smart_ptr/local_shared_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <sstream>
+
+template<class T> std::string to_string( T const& t )
+{
+    std::ostringstream os;
+    os << t;
+    return os.str();
+}
+
+template<class T> std::wstring to_wstring( T const& t )
+{
+    std::wostringstream os;
+    os << t;
+    return os.str();
+}
+
+int main()
+{
+    boost::local_shared_ptr<int> p1, p2( new int );
+
+    BOOST_TEST_EQ( to_string( p1 ), to_string( p1.get() ) );
+    BOOST_TEST_EQ( to_string( p2 ), to_string( p2.get() ) );
+
+    BOOST_TEST( to_wstring( p1 ) == to_wstring( p1.get() ) );
+    BOOST_TEST( to_wstring( p2 ) == to_wstring( p2.get() ) );
+
+    return boost::report_errors();
+}

test/sp_ostream_test.cpp

@@ -0,0 +1,34 @@
+// Copyright 2025 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/shared_ptr.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <sstream>
+
+template<class T> std::string to_string( T const& t )
+{
+    std::ostringstream os;
+    os << t;
+    return os.str();
+}
+
+template<class T> std::wstring to_wstring( T const& t )
+{
+    std::wostringstream os;
+    os << t;
+    return os.str();
+}
+
+int main()
+{
+    boost::shared_ptr<int> p1, p2( new int );
+
+    BOOST_TEST_EQ( to_string( p1 ), to_string( p1.get() ) );
+    BOOST_TEST_EQ( to_string( p2 ), to_string( p2.get() ) );
+
+    BOOST_TEST( to_wstring( p1 ) == to_wstring( p1.get() ) );
+    BOOST_TEST( to_wstring( p2 ) == to_wstring( p2.get() ) );
+
+    return boost::report_errors();
+}