Serialization

Add support for modular build structure.

.github/workflows/ci.yml

@@ -18,165 +18,181 @@ jobs:
       matrix:
         include:
           - toolset: gcc-4.8
-            cxxstd: "03,11"
+            cxxstd: "11"
             os: ubuntu-latest
             container: ubuntu:18.04
-            install: g++-4.8-multilib
-            address-model: 32,64
+            install: g++-4.8
           - toolset: gcc-5
-            cxxstd: "03,11,14,1z"
+            cxxstd: "11,14,1z"
             os: ubuntu-latest
             container: ubuntu:18.04
-            install: g++-5-multilib
-            address-model: 32,64
+            install: g++-5
           - toolset: gcc-6
-            cxxstd: "03,11,14,1z"
+            cxxstd: "11,14,1z"
             os: ubuntu-latest
             container: ubuntu:18.04
-            install: g++-6-multilib
-            address-model: 32,64
+            install: g++-6
           - toolset: gcc-7
-            cxxstd: "03,11,14,17"
+            cxxstd: "11,14,17"
             os: ubuntu-latest
             container: ubuntu:18.04
-            install: g++-7-multilib
-            address-model: 32,64
           - toolset: gcc-8
-            cxxstd: "03,11,14,17,2a"
+            cxxstd: "11,14,17,2a"
             os: ubuntu-20.04
-            install: g++-8-multilib
-            address-model: 32,64
+            install: g++-8
           - toolset: gcc-9
-            cxxstd: "03,11,14,17,2a"
+            cxxstd: "11,14,17,2a"
             os: ubuntu-20.04
-            install: g++-9-multilib
-            address-model: 32,64
           - toolset: gcc-10
-            cxxstd: "03,11,14,17,2a"
+            cxxstd: "11,14,17,2a"
             os: ubuntu-20.04
-            install: g++-10-multilib
-            address-model: 32,64
+            install: g++-10
           - toolset: gcc-11
-            cxxstd: "03,11,14,17,20"
-            os: ubuntu-20.04
-            install: g++-11-multilib
-            address-model: 32,64
-          - toolset: gcc-12
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,2a"
             os: ubuntu-22.04
-            install: g++-12-multilib
-            address-model: 32,64
+          - toolset: gcc-12
+            cxxstd: "11,14,17,20,2b"
+            os: ubuntu-22.04
+            install: g++-12
           - toolset: gcc-13
-            cxxstd: "03,11,14,17,20,2b"
-            container: ubuntu:23.04
+            cxxstd: "11,14,17,20,2b"
             os: ubuntu-latest
-            install: g++-13-multilib
-            address-model: 32,64
+            container: ubuntu:24.04
+            install: g++-13
+          - toolset: gcc-14
+            cxxstd: "11,14,17,20,2b"
+            os: ubuntu-latest
+            container: ubuntu:24.04
+            install: g++-14
           - toolset: clang
             compiler: clang++-3.9
-            cxxstd: "03,11,14"
+            cxxstd: "11,14"
             os: ubuntu-latest
             container: ubuntu:18.04
             install: clang-3.9
           - toolset: clang
             compiler: clang++-4.0
-            cxxstd: "03,11,14"
+            cxxstd: "11,14"
             os: ubuntu-latest
             container: ubuntu:18.04
             install: clang-4.0
           - toolset: clang
             compiler: clang++-5.0
-            cxxstd: "03,11,14,1z"
+            cxxstd: "11,14,1z"
             os: ubuntu-latest
             container: ubuntu:18.04
             install: clang-5.0
           - toolset: clang
             compiler: clang++-6.0
-            cxxstd: "03,11,14,17"
+            cxxstd: "11,14,17"
             os: ubuntu-20.04
             install: clang-6.0
           - toolset: clang
             compiler: clang++-7
-            cxxstd: "03,11,14,17"
+            cxxstd: "11,14,17"
             os: ubuntu-20.04
             install: clang-7
           - toolset: clang
             compiler: clang++-8
-            cxxstd: "03,11,14,17"
+            cxxstd: "11,14,17"
             os: ubuntu-20.04
             install: clang-8
           - toolset: clang
             compiler: clang++-9
-            cxxstd: "03,11,14,17,2a"
+            cxxstd: "11,14,17"
             os: ubuntu-20.04
             install: clang-9
           - toolset: clang
             compiler: clang++-10
-            cxxstd: "03,11,14,17,2a"
+            cxxstd: "11,14,17,2a"
             os: ubuntu-20.04
           - toolset: clang
             compiler: clang++-11
-            cxxstd: "03,11,14,17,2a"
+            cxxstd: "11,14,17,2a"
             os: ubuntu-20.04
           - toolset: clang
             compiler: clang++-12
-            cxxstd: "03,11,14,17,20"
+            cxxstd: "11,14,17,20"
             os: ubuntu-20.04
           - toolset: clang
             compiler: clang++-13
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             container: ubuntu:22.04
             os: ubuntu-latest
             install: clang-13
           - toolset: clang
             compiler: clang++-14
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             container: ubuntu:22.04
             os: ubuntu-latest
             install: clang-14
           - toolset: clang
             compiler: clang++-15
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             container: ubuntu:22.04
             os: ubuntu-latest
             install: clang-15
           - toolset: clang
             compiler: clang++-16
-            cxxstd: "03,11,14,17,20,2b"
-            container: ubuntu:23.04
+            cxxstd: "11,14,17,20,2b"
+            container: ubuntu:24.04
             os: ubuntu-latest
             install: clang-16
           - toolset: clang
             compiler: clang++-17
-            cxxstd: "03,11,14,17,20,2b"
-            container: ubuntu:23.10
+            cxxstd: "11,14,17,20,2b"
+            container: ubuntu:24.04
             os: ubuntu-latest
             install: clang-17
           - toolset: clang
-            cxxstd: "03,11,14,17,2a"
-            os: macos-11
+            compiler: clang++-18
+            cxxstd: "11,14,17,20,2b"
+            container: ubuntu:24.04
+            os: ubuntu-latest
+            install: clang-18
           - toolset: clang
-            cxxstd: "03,11,14,17,20,2b"
-            os: macos-12
+            compiler: clang++-19
+            cxxstd: "11,14,17,20,2b"
+            container: ubuntu:24.10
+            os: ubuntu-latest
+            install: clang-19
           - toolset: clang
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             os: macos-13
+          - toolset: clang
+            cxxstd: "11,14,17,20,2b"
+            os: macos-14
+          - toolset: clang
+            cxxstd: "11,14,17,20,2b"
+            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:
-      - 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
@@ -203,6 +219,10 @@ jobs:
           cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
           git submodule update --init tools/boostdep
           python3 tools/boostdep/depinst/depinst.py --git_args "--jobs 3" $LIBRARY
+          cd libs/throw_exception
+          git fetch origin feature/serialization
+          git checkout feature/serialization
+          cd ../..
           ./bootstrap.sh
           ./b2 -d0 headers
 
@@ -211,10 +231,15 @@ jobs:
         run: |
           echo "using ${{matrix.toolset}} : : ${{matrix.compiler}} ;" > ~/user-config.jam
 
+      - name: Download nlohmann/json
+        run: |
+          cd ../boost-root/libs/$LIBRARY
+          python3 scripts/download_nlohmann_json.py
+
       - name: Run tests
         run: |
           cd ../boost-root
-          ./b2 -j3 libs/$LIBRARY/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} ${ADDRMD:+address-model=$ADDRMD} variant=debug,release exception-handling=on,off rtti=on,off link=static,shared visibility=hidden,global
+          ./b2 -j3 libs/$LIBRARY/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} variant=debug,release exception-handling=on,off rtti=on,off link=static,shared visibility=hidden,global
 
   windows:
     strategy:
@@ -222,7 +247,7 @@ jobs:
       matrix:
         include:
           - toolset: msvc-14.0
-            cxxstd: 14,latest
+            cxxstd: "14"
             addrmd: 32,64
             os: windows-2019
           - toolset: msvc-14.2
@@ -234,18 +259,18 @@ jobs:
             addrmd: 32,64
             os: windows-2022
           - toolset: clang-win
-            cxxstd: "14,17,latest"
+            cxxstd: "14,17,20,latest"
             addrmd: 32,64
             os: windows-2022
           - toolset: gcc
-            cxxstd: "03,11,14,17,2a"
+            cxxstd: "11,14,17,2a"
             addrmd: 64
             os: windows-2019
 
     runs-on: ${{matrix.os}}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup Boost
         shell: cmd
@@ -266,9 +291,19 @@ jobs:
           xcopy /s /e /q %GITHUB_WORKSPACE% libs\%LIBRARY%\
           git submodule update --init tools/boostdep
           python tools/boostdep/depinst/depinst.py --git_args "--jobs 3" %LIBRARY%
+          cd libs\throw_exception
+          git fetch origin feature/serialization
+          git checkout feature/serialization
+          cd ..\..
           cmd /c bootstrap
           b2 -d0 headers
 
+      - name: Download nlohmann/json
+        shell: cmd
+        run: |
+          cd ../boost-root/libs/%LIBRARY%
+          python3 scripts/download_nlohmann_json.py
+
       - name: Run tests
         shell: cmd
         run: |

.gitignore

@@ -1,3 +1,4 @@
 /.vscode/ipch/*
 /.vscode/settings.json
 .DS_Store
+/test/nlohmann/

.vscode/tasks.json

@@ -0,0 +1,101 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Download nlohmann/json.hpp",
+            "type": "shell",
+            "command": "python scripts/download_nlohmann_json.py",
+            "options": {
+                "cwd": "${workspaceFolder}"
+            },
+            "problemMatcher": []
+        },
+        {
+            "label": "b2: Run all tests (default)",
+            "type": "shell",
+            "dependsOn": ["Download nlohmann/json.hpp"],
+            "command": "../../b2 test",
+            "options": {
+                "cwd": "${workspaceFolder}"
+            },
+            "group": "test",
+            "problemMatcher": {
+                "base": "$gcc",
+                "fileLocation": ["relative", "${workspaceFolder}"]
+            },
+            "windows": {
+                "command": "..\\..\\b2 test",
+                "problemMatcher": {
+                    "base": "$msCompile",
+                    "fileLocation": ["relative", "${workspaceFolder}"]
+                }
+            }
+        },
+        {
+            "label": "b2: Run all tests (release)",
+            "type": "shell",
+            "dependsOn": ["Download nlohmann/json.hpp"],
+            "command": "../../b2 test variant=release",
+            "options": {
+                "cwd": "${workspaceFolder}"
+            },
+            "group": "test",
+            "problemMatcher": {
+                "base": "$gcc",
+                "fileLocation": ["relative", "${workspaceFolder}"]
+            },
+            "windows": {
+                "command": "..\\..\\b2 test variant=release",
+                "problemMatcher": {
+                    "base": "$msCompile",
+                    "fileLocation": ["relative", "${workspaceFolder}"]
+                }
+            }
+        },
+        {
+            "label": "b2: Run all tests (all configs)",
+            "type": "shell",
+            "dependsOn": ["Download nlohmann/json.hpp"],
+            "command": "../../b2 test exception-handling=on,off rtti=on,off variant=debug,release link=static,shared",
+            "options": {
+                "cwd": "${workspaceFolder}"
+            },
+            "group": "test",
+            "problemMatcher": {
+                "base": "$gcc",
+                "fileLocation": ["relative", "${workspaceFolder}"]
+            },
+            "windows": {
+                "command": "..\\..\\b2 test exception-handling=on,off rtti=on,off variant=debug,release link=static,shared",
+                "problemMatcher": {
+                    "base": "$msCompile",
+                    "fileLocation": ["relative", "${workspaceFolder}"]
+                }
+            }
+        },
+        {
+            "label": "b2: Run test for current editor file",
+            "type": "shell",
+            "dependsOn": ["Download nlohmann/json.hpp"],
+            "command": "../../b2 test ${fileBasenameNoExtension}.test",
+            "options": {
+                "cwd": "${workspaceFolder}"
+            },
+            "group": {
+                "kind": "test",
+                "isDefault": true
+            },
+            "problemMatcher": {
+                "base": "$gcc",
+                "fileLocation": ["relative", "${workspaceFolder}"]
+            },
+            "windows": {
+                "command": "..\\..\\b2 test ${fileBasenameNoExtension}.test",
+                "problemMatcher": {
+                    "base": "$msCompile",
+                    "fileLocation": ["relative", "${workspaceFolder}"]
+                }
+            }
+        }
+    ]
+}

CMakeLists.txt

@@ -1,3 +1,4 @@
+# Generated by `boostdep --cmake exception`
 # Copyright 2020, 2021 Peter Dimov
 # Distributed under the Boost Software License, Version 1.0.
 # https://www.boost.org/LICENSE_1_0.txt
@@ -6,16 +7,13 @@ cmake_minimum_required(VERSION 3.5...3.20)
 
 project(boost_exception VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
 
-add_library(boost_exception STATIC
-  src/clone_current_exception_non_intrusive.cpp
-)
-
+add_library(boost_exception INTERFACE)
 add_library(Boost::exception ALIAS boost_exception)
 
-target_include_directories(boost_exception PUBLIC include)
+target_include_directories(boost_exception INTERFACE include)
 
 target_link_libraries(boost_exception
-  PUBLIC
+  INTERFACE
     Boost::assert
     Boost::config
     Boost::core

build.jam

@@ -0,0 +1,27 @@
+# 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/config//boost_config
+    /boost/core//boost_core
+    /boost/smart_ptr//boost_smart_ptr
+    /boost/throw_exception//boost_throw_exception
+    /boost/tuple//boost_tuple
+    /boost/type_traits//boost_type_traits ;
+
+project /boost/exception
+    ;
+
+explicit
+    [ alias boost_exception : build//boost_exception ]
+    [ alias all : boost_exception example test ]
+    ;
+
+call-if : boost-library exception
+    : install boost_exception
+    ;

build/Jamfile.v2

@@ -5,10 +5,11 @@
 # 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)
 
-project boost/exception
+project
     : source-location ../src
+    : common-requirements <include>../include <library>$(boost_dependencies)
     : requirements <link>static
+    : usage-requirements <define>BOOST_EXCEPTION_NO_LIB=1
     ;
 
-lib boost_exception : clone_current_exception_non_intrusive.cpp ;
-boost-install boost_exception ;
+lib boost_exception : clone_current_exception_non_intrusive.cpp :  <exception-handling>on ;

example/Jamfile

@@ -5,11 +5,13 @@
 # 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)
 
+project : requirements <library>/boost/exception//boost_exception ;
+
 exe example_io : example_io.cpp ;
 obj error_info_1 : error_info_1.cpp ;
 obj error_info_2 : error_info_2.cpp ;
 obj cloning_1 : cloning_1.cpp ;
-obj cloning_2 : cloning_2.cpp : <threading>multi ;
+obj cloning_2 : cloning_2.cpp /boost/thread//boost_thread : <threading>multi ;
 obj info_tuple : info_tuple.cpp ;
 obj enable_error_info : enable_error_info.cpp ;
 obj logging : logging.cpp ;

include/boost/exception/detail/error_info_impl.hpp

@@ -13,6 +13,8 @@
 #include <utility>
 #include <string>
 
+namespace boost { namespace exception_detail { class writer; } }
+
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
 #if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
 #pragma GCC system_header
@@ -38,6 +40,7 @@ boost
 
             virtual std::string name_value_string() const = 0;
             virtual error_info_base * clone() const = 0;
+            virtual void write_to(writer &) const = 0;
 
             virtual
             ~error_info_base() BOOST_NOEXCEPT_OR_NOTHROW
@@ -97,6 +100,7 @@ boost
         error_info & operator=( error_info && x );
 #endif
         std::string name_value_string() const;
+        void write_to(exception_detail::writer &) const;
         value_type v_;
         };
     }

include/boost/exception/detail/requires_cxx11.hpp

@@ -21,4 +21,4 @@ BOOST_PRAGMA_MESSAGE("C++03 support was deprecated in Boost.Exception 1.85 and w
 
 #endif
 
-#endif
+#endif

include/boost/exception/detail/type_info.hpp

@@ -11,7 +11,17 @@
 #include <boost/core/demangle.hpp>
 #include <boost/current_function.hpp>
 #include <string>
-#include <string.h>
+#include <ostream>
+#include <cstring>
+#include <cstddef>
+
+#ifndef BOOST_EXCEPTION_PRETTY_FUNCTION
+#   if defined(_MSC_VER) && !defined(__clang__) && !defined(__GNUC__)
+#       define BOOST_EXCEPTION_PRETTY_FUNCTION __FUNCSIG__
+#   else
+#       define BOOST_EXCEPTION_PRETTY_FUNCTION __PRETTY_FUNCTION__
+#   endif
+#endif
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
 #if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
@@ -73,6 +83,206 @@ boost
                 return a.type_!=b.type_ && strcmp(a.type_->name(), b.type_->name()) < 0;
                 }
             };
+
+        template <int S1, int S2, int I, bool = (S1 >= S2)>
+        struct
+        cpp11_prefix
+            {
+            BOOST_FORCEINLINE static constexpr
+            bool
+            check(char const (&)[S1], char const (&)[S2]) noexcept
+                {
+                return false;
+                }
+            };
+
+        template <int S1, int S2, int I>
+        struct
+        cpp11_prefix<S1, S2, I, true>
+            {
+            BOOST_FORCEINLINE static constexpr
+            bool
+            check(char const (&str)[S1], char const (&prefix)[S2]) noexcept
+                {
+                return str[I] == prefix[I] && cpp11_prefix<S1, S2, I - 1>::check(str, prefix);
+                }
+            };
+
+        template <int S1, int S2>
+        struct
+        cpp11_prefix<S1, S2, 0, true>
+            {
+            BOOST_FORCEINLINE static constexpr
+            bool
+            check(char const (&str)[S1], char const (&prefix)[S2]) noexcept
+                {
+                return str[0] == prefix[0];
+                }
+            };
+
+        template <int S1, int S2>
+        BOOST_FORCEINLINE constexpr
+        int
+        check_prefix(char const (&str)[S1], char const (&prefix)[S2]) noexcept
+            {
+            return cpp11_prefix<S1, S2, S2 - 2>::check(str, prefix) ? S2 - 1 : 0;
+            }
+
+        template <int S1, int S2, int I1, int I2, bool = (S1 >= S2)>
+        struct
+        cpp11_suffix
+            {
+            BOOST_FORCEINLINE static constexpr
+            bool
+            check(char const (&)[S1], char const (&)[S2]) noexcept
+                {
+                return false;
+                }
+            };
+
+        template <int S1, int S2, int I1, int I2>
+        struct
+        cpp11_suffix<S1, S2, I1, I2, true>
+            {
+            BOOST_FORCEINLINE static constexpr
+            bool
+            check(char const (&str)[S1], char const (&suffix)[S2]) noexcept
+                {
+                return str[I1] == suffix[I2] && cpp11_suffix<S1, S2, I1 - 1, I2 - 1>::check(str, suffix);
+                }
+            };
+
+        template <int S1, int S2, int I1>
+        struct
+        cpp11_suffix<S1, S2, I1, 0, true>
+            {
+            BOOST_FORCEINLINE static constexpr
+            bool
+            check(char const (&str)[S1], char const (&suffix)[S2]) noexcept
+                {
+                return str[I1] == suffix[0];
+                }
+            };
+
+        template <int S1, int S2>
+        BOOST_FORCEINLINE constexpr
+        int
+        check_suffix(char const (&str)[S1], char const (&suffix)[S2]) noexcept
+            {
+            return cpp11_suffix<S1, S2, S1 - 2, S2 - 2>::check(str, suffix) ? S1 - S2 : 0;
+            }
+
+        }
+
+    namespace
+    n
+        {
+        struct
+        r
+            {
+            char const * name_not_zero_terminated_at_length;
+            std::size_t length;
+            };
+
+#ifdef _MSC_VER
+#   define BOOST_EXCEPTION_CDECL __cdecl
+#else
+#   define BOOST_EXCEPTION_CDECL
+#endif
+
+        template <class T>
+        BOOST_FORCEINLINE
+        r
+        BOOST_EXCEPTION_CDECL
+        p()
+            {
+#define BOOST_EXCEPTION_P(P) (sizeof(char[1 + exception_detail::check_prefix(BOOST_EXCEPTION_PRETTY_FUNCTION, P)]) - 1)
+            // clang style:
+            std::size_t const p01 = BOOST_EXCEPTION_P("r boost::n::p() [T = ");
+            std::size_t const p02 = BOOST_EXCEPTION_P("r __cdecl boost::n::p(void) [T = ");
+            // old clang style:
+            std::size_t const p03 = BOOST_EXCEPTION_P("boost::n::r boost::n::p() [T = ");
+            std::size_t const p04 = BOOST_EXCEPTION_P("boost::n::r __cdecl boost::n::p(void) [T = ");
+            // gcc style:
+            std::size_t const p05 = BOOST_EXCEPTION_P("boost::n::r boost::n::p() [with T = ");
+            std::size_t const p06 = BOOST_EXCEPTION_P("boost::n::r __cdecl boost::n::p() [with T = ");
+            // msvc style, struct:
+            std::size_t const p07 = BOOST_EXCEPTION_P("struct boost::n::r __cdecl boost::n::p<struct ");
+            // msvc style, class:
+            std::size_t const p08 = BOOST_EXCEPTION_P("struct boost::n::r __cdecl boost::n::p<class ");
+            // msvc style, enum:
+            std::size_t const p09 = BOOST_EXCEPTION_P("struct boost::n::r __cdecl boost::n::p<enum ");
+            // msvc style, built-in type:
+            std::size_t const p10 = BOOST_EXCEPTION_P("struct boost::n::r __cdecl boost::n::p<");
+#undef BOOST_EXCEPTION_P
+
+#define BOOST_EXCEPTION_S(S) (sizeof(char[1 + exception_detail::check_suffix(BOOST_EXCEPTION_PRETTY_FUNCTION, S)]) - 1)
+            // clang/gcc style:
+            std::size_t const s01 = BOOST_EXCEPTION_S("]");
+            // msvc style:
+            std::size_t const s02 = BOOST_EXCEPTION_S(">(void)");
+#undef BOOST_EXCEPTION_S
+
+            char static_assert_unrecognized_pretty_function_format_please_file_github_issue[sizeof(
+                char[
+                    (s01 && (1 == (!!p01 + !!p02 + !!p03 + !!p04 + !!p05 + !!p06)))
+                    ||
+                    (s02 && (1 == (!!p07 + !!p08 + !!p09)))
+                    ||
+                    (s02 && !!p10)
+                ]
+            ) * 2 - 1];
+            (void) static_assert_unrecognized_pretty_function_format_please_file_github_issue;
+
+            if( std::size_t const p = sizeof(char[1 + !!s01 * (p01 + p02 + p03 + p04 + p05 + p06)]) - 1 )
+                return { BOOST_EXCEPTION_PRETTY_FUNCTION + p, s01 - p };
+
+            if( std::size_t const p = sizeof(char[1 + !!s02 * (p07 + p08 + p09)]) - 1 )
+                return { BOOST_EXCEPTION_PRETTY_FUNCTION + p, s02 - p };
+
+            std::size_t const p = sizeof(char[1 + !!s02 * p10]) - 1;
+            return { BOOST_EXCEPTION_PRETTY_FUNCTION + p, s02 - p };
+            }
+
+#undef BOOST_EXCEPTION_CDECL
+        }
+
+    namespace
+    exception_detail
+        {
+        struct
+        pretty_type_name
+            {
+            char const * name_not_zero_terminated_at_length;
+            std::size_t length;
+
+            template <class CharT, class Traits>
+            friend
+            std::basic_ostream<CharT, Traits> &
+            operator<<(std::basic_ostream<CharT, Traits> & os, pretty_type_name const & x)
+                {
+                return os.write(x.name_not_zero_terminated_at_length, x.length);
+                }
+
+            template <std::size_t S>
+            friend
+            char *
+            to_zstr(char (&zstr)[S], pretty_type_name const & x) noexcept
+                {
+                std::size_t n = x.length < S - 1 ? x.length : S - 1;
+                std::memcpy(zstr, x.name_not_zero_terminated_at_length, n);
+                zstr[n] = 0;
+                return zstr;
+                }
+            };
+
+        template <class T>
+        pretty_type_name
+        get_pretty_tag_type_name()
+            {
+            n::r parsed = n::p<T>();
+            return { parsed.name_not_zero_terminated_at_length, parsed.length };
+            }
         }
     }
 

include/boost/exception/detail/writer.hpp

@@ -0,0 +1,114 @@
+//Copyright (c) 2006-2026 Emil Dotchevski and Reverge Studios, Inc.
+
+//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)
+
+#ifndef BOOST_EXCEPTION_DETAIL_WRITER_HPP_INCLUDED
+#define BOOST_EXCEPTION_DETAIL_WRITER_HPP_INCLUDED
+
+#include <boost/exception/detail/type_info.hpp>
+#include <type_traits>
+#include <utility>
+
+namespace
+boost
+    {
+    template <class Tag, class T> class error_info;
+
+    namespace
+    exception_serialization
+        {
+        struct writer_adl {};
+        }
+
+    namespace
+    exception_detail
+        {
+        template <class T>
+        struct first_arg;
+
+        template <class C, class R, class A1, class... A>
+        struct
+        first_arg<R(C::*)(A1, A...)>
+            {
+            using type = A1;
+            };
+
+        template <class C, class R, class A1, class... A>
+        struct
+        first_arg<R(C::*)(A1, A...) const>
+            {
+            using type = A1;
+            };
+
+        class
+        writer:
+            exception_serialization::writer_adl
+            {
+            writer(writer const &) = delete;
+            writer & operator=(writer const &) = delete;
+
+            core::typeinfo const * type_;
+            void * w_;
+
+            bool
+            dispatch_()
+                {
+                return false;
+                }
+
+            template <class F1, class... Fn>
+            bool
+            dispatch_(F1 && f1, Fn && ... fn)
+                {
+                using writer_type = typename std::decay<typename first_arg<decltype(&std::decay<F1>::type::operator())>::type>::type;
+                if (writer_type * w = get<writer_type>())
+                    {
+                    std::forward<F1>(f1)(*w);
+                    return true;
+                    }
+                return dispatch_(std::forward<Fn>(fn)...);
+                }
+
+            protected:
+
+            template <class Writer>
+            explicit
+            writer(Writer * w) noexcept:
+                type_(&BOOST_CORE_TYPEID(Writer)),
+                w_(w)
+                {
+                }
+
+            public:
+
+            template <class Writer>
+            Writer *
+            get() noexcept
+                {
+                return *type_ == BOOST_CORE_TYPEID(Writer) ? static_cast<Writer *>(w_) : nullptr;
+                }
+
+            template <class... Fn>
+            bool
+            dispatch(Fn && ... fn)
+                {
+                return dispatch_(std::forward<Fn>(fn)...);
+                }
+            };
+
+        template <class Writer>
+        struct
+        writer_adaptor:
+            writer
+            {
+            explicit
+            writer_adaptor(Writer & w) noexcept:
+                writer(&w)
+                {
+                }
+            };
+        }
+    }
+
+#endif

include/boost/exception/diagnostic_information.hpp

@@ -205,6 +205,65 @@ boost
 #endif
         return w;
         }
+
+    namespace
+    exception_detail
+        {
+        template <class Writer>
+        void
+        write_diagnostic_information_to_impl_( boost::exception const * be, std::exception const * se, Writer & w )
+            {
+            if( !be && !se )
+                return;
+#ifndef BOOST_NO_RTTI
+            if( !be )
+                be=dynamic_cast<boost::exception const *>(se);
+            if( !se )
+                se=dynamic_cast<std::exception const *>(be);
+#endif
+            if( be )
+                {
+                if( char const * const * f=get_error_info<throw_file>(*be) )
+                    write_nested(w, *f, "throw_file");
+                if( int const * l=get_error_info<throw_line>(*be) )
+                    write_nested(w, *l, "throw_line");
+                if( char const * const * fn=get_error_info<throw_function>(*be) )
+                    write_nested(w, *fn, "throw_function");
+                }
+#ifndef BOOST_NO_RTTI
+            if( be || se )
+                write_nested(w, core::demangle((be?(BOOST_EXCEPTION_DYNAMIC_TYPEID(*be)):(BOOST_EXCEPTION_DYNAMIC_TYPEID(*se))).type_->name()).c_str(), "dynamic_exception_type");
+#endif
+            if( se )
+                if( char const * wh = se->what() )
+                    write_nested(w, wh, "std::exception::what");
+            if( be )
+                if( error_info_container * c = be->data_.get() )
+                    {
+                    writer_adaptor<Writer> wa(w);
+                    c->write_to(wa);
+                    }
+            }
+        }
+
+    template <class T, class Writer>
+    void
+    write_diagnostic_information_to( T const & e, Writer & w )
+        {
+        exception_detail::write_diagnostic_information_to_impl_(exception_detail::get_boost_exception(&e),exception_detail::get_std_exception(&e),w);
+        }
+
+#ifndef BOOST_NO_EXCEPTIONS
+    template <class Writer>
+    void
+    write_current_exception_diagnostic_information_to( Writer & w )
+        {
+        boost::exception const * be=current_exception_cast<boost::exception const>();
+        std::exception const * se=current_exception_cast<std::exception const>();
+        if( be || se )
+            exception_detail::write_diagnostic_information_to_impl_(be,se,w);
+        }
+#endif
     }
 
 #if defined(_MSC_VER) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)

include/boost/exception/info.hpp

@@ -11,7 +11,9 @@
 #include <boost/exception/to_string_stub.hpp>
 #include <boost/exception/detail/error_info_impl.hpp>
 #include <boost/exception/detail/shared_ptr.hpp>
+#include <boost/exception/detail/writer.hpp>
 #include <map>
+#include <type_traits>
 
 #ifndef BOOST_EXCEPTION_ENABLE_WARNINGS
 #if defined(__GNUC__) && __GNUC__*100+__GNUC_MINOR__>301
@@ -28,6 +30,36 @@
 namespace
 boost
     {
+    namespace
+    exception_serialization
+        {
+        template <class Writer, class T, class... Unused>
+        typename std::enable_if<std::is_base_of<exception_detail::writer, Writer>::value>::type
+        serialize(Writer &, T const &, char const *, Unused && ...)
+            {
+            }
+
+        template <class Writer, class Tag, class T>
+        void
+        write(Writer & w, error_info<Tag, T> const & e)
+            {
+            write(w, e.value());
+            }
+        }
+
+    namespace
+    exception_detail
+        {
+        template <class Tag, class T>
+        void
+        serialize_(writer & w, error_info<Tag,T> const & x)
+            {
+            using namespace boost::exception_serialization;
+            char buf[256];
+            serialize(w, x.value(), to_zstr(buf, get_pretty_tag_type_name<Tag>()));
+            }
+        }
+
     template <class Tag,class T>
     inline
     std::string
@@ -53,6 +85,15 @@ boost
         return to_string_stub(*this);
         }
 
+    template <class Tag,class T>
+    inline
+    void
+    error_info<Tag,T>::
+    write_to(exception_detail::writer & w) const
+        {
+        exception_detail::serialize_(w, *this);
+        }
+
     namespace
     exception_detail
         {
@@ -108,6 +149,16 @@ boost
                 return diagnostic_info_str_.c_str();
                 }
 
+            void
+            write_to( writer & w ) const
+                {
+                for( error_info_map::const_iterator i=info_.begin(),end=info_.end(); i!=end; ++i )
+                    {
+                    error_info_base const & x = *i->second;
+                    x.write_to(w);
+                    }
+                }
+
             private:
 
             friend class boost::exception;

include/boost/exception/serialization/nlohmann_writer.hpp

@@ -0,0 +1,43 @@
+//Copyright (c) 2006-2026 Emil Dotchevski and Reverge Studios, Inc.
+
+//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)
+
+#ifndef BOOST_EXCEPTION_SERIALIZATION_NLOHMANN_WRITER_HPP_INCLUDED
+#define BOOST_EXCEPTION_SERIALIZATION_NLOHMANN_WRITER_HPP_INCLUDED
+
+#include <utility>
+
+namespace
+boost
+    {
+    namespace
+    exception_serialization
+        {
+        template <class Json>
+        struct
+        nlohmann_writer
+            {
+            Json & j_;
+
+            template <class T>
+            friend
+            auto
+            write(nlohmann_writer & w, T const & x) -> decltype(to_json(std::declval<Json &>(), x))
+                {
+                to_json(w.j_, x);
+                }
+
+            template <class T>
+            friend
+            void
+            write_nested(nlohmann_writer & w, T const & x, char const * name)
+                {
+                nlohmann_writer nested{w.j_[name]};
+                write(nested, x);
+                }
+            };
+        }
+    }
+
+#endif

scripts/download_nlohmann_json.py

@@ -0,0 +1,33 @@
+"""
+
+    Copyright 2018-2026 Emil Dotchevski and Reverge Studios, Inc.
+
+    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 program downloads the nlohmann/json single header distribution.
+
+    Usage:
+
+        python3 download_nlohmann_json.py
+
+"""
+
+import urllib.request
+import os
+
+url = "https://github.com/nlohmann/json/releases/download/v3.11.3/json.hpp"
+output_dir = os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "test", "nlohmann")
+output_file = os.path.join(output_dir, "json.hpp")
+
+def _main():
+    if os.path.exists(output_file):
+        print(f"{output_file} already exists, skipping download")
+        return
+    os.makedirs(output_dir, exist_ok=True)
+    print(f"Downloading {url}...")
+    urllib.request.urlretrieve(url, output_file)
+    print(f"Saved to {output_file}")
+
+if __name__ == "__main__":
+    _main()

test/Jamfile.v2

@@ -7,6 +7,8 @@
 
 import testing ;
 
+project : requirements <library>/boost/exception//boost_exception ;
+
 #to_string
 
 run is_output_streamable_test.cpp ;
@@ -22,7 +24,7 @@ run 2-throw_exception_no_exceptions_test.cpp : : : <exception-handling>off ;
 run 3-throw_exception_no_integration_test.cpp : : : <exception-handling>on ;
 run 4-throw_exception_no_both_test.cpp : : : <exception-handling>off ;
 run cloning_test.cpp : : : <exception-handling>on ;
-run copy_exception_test.cpp ../../thread/src/tss_null.cpp /boost//thread : : : <threading>multi <exception-handling>on ;
+run copy_exception_test.cpp ../../thread/src/tss_null.cpp /boost/thread//boost_thread : : : <threading>multi <exception-handling>on ;
 run copy_exception_no_exceptions_test.cpp : : : <exception-handling>off <rtti>on ;
 run unknown_exception_test.cpp : : : <exception-handling>on ;
 run exception_test.cpp : : : <exception-handling>on ;
@@ -39,8 +41,9 @@ run refcount_ptr_test.cpp ;
 run current_exception_cast_test.cpp : : : <exception-handling>on ;
 run no_exceptions_test.cpp : : : <exception-handling>off ;
 run errinfos_test.cpp : : : <exception-handling>on ;
-run exception_ptr_test.cpp/<define>BOOST_ENABLE_NON_INTRUSIVE_EXCEPTION_PTR ../../thread/src/tss_null.cpp /boost/exception /boost//thread : : : <threading>multi <exception-handling>on : non_intrusive_exception_ptr_test ;
-run exception_ptr_test.cpp ../../thread/src/tss_null.cpp /boost//thread : : : <threading>multi <exception-handling>on ;
+run nlohmann_test.cpp : : : <exception-handling>on ;
+run exception_ptr_test.cpp/<define>BOOST_ENABLE_NON_INTRUSIVE_EXCEPTION_PTR ../../thread/src/tss_null.cpp /boost/exception//boost_exception /boost/thread//boost_thread : : : <threading>multi <exception-handling>on : non_intrusive_exception_ptr_test ;
+run exception_ptr_test.cpp ../../thread/src/tss_null.cpp /boost/thread//boost_thread : : : <threading>multi <exception-handling>on ;
 run exception_ptr_test2.cpp ;
 
 lib visibility_test_lib : visibility_test_lib.cpp : <visibility>hidden <exception-handling>on ;

test/copy_exception_test.cpp

@@ -12,7 +12,7 @@
 #include <boost/exception_ptr.hpp>
 #include <boost/exception/get_error_info.hpp>
 #include <boost/thread.hpp>
-#include <boost/detail/atomic_count.hpp>
+#include <boost/smart_ptr/detail/atomic_count.hpp>
 #include <boost/detail/lightweight_test.hpp>
 
 typedef boost::error_info<struct tag_answer,int> answer;

test/diagnostic_information_test.cpp

@@ -13,6 +13,7 @@
 #include <boost/exception/info.hpp>
 #include <boost/detail/lightweight_test.hpp>
 #include <boost/detail/workaround.hpp>
+#include <iostream>
 
 #if BOOST_WORKAROUND(BOOST_CODEGEARC, BOOST_TESTED_AT(0x610))
 struct test_tag1 {};
@@ -141,9 +142,11 @@ main()
     catch(
     error1 & x )
         {
-        std::string di1=boost::diagnostic_information(x);
+        std::string di1 = diagnostic_information(x);
+        std::cout << __LINE__ << " ------------------\n" << di1;
         x << tagged_int1(2) << tagged_int2(2);
         std::string di2 = diagnostic_information(x);
+        std::cout << "\n" << di2 << std::endl;
         test1(di1,di2);
         }
     try
@@ -155,9 +158,11 @@ main()
     catch(
     error1 & x )
         {
-        std::string di1=boost::current_exception_diagnostic_information();
+        std::string di1 = current_exception_diagnostic_information();
+        std::cout << __LINE__ << " ------------------\n" << di1;
         x << tagged_int1(2) << tagged_int2(2);
         std::string di2 = current_exception_diagnostic_information();
+        std::cout << "\n" << di2 << std::endl;
         test1(di1,di2);
         }
     try
@@ -170,8 +175,10 @@ main()
     error2 & x )
         {
         std::string di1 = diagnostic_information(x);
+        std::cout << __LINE__ << " ------------------\n" << di1;
         x << tagged_int1(2) << tagged_int2(2);
         std::string di2 = diagnostic_information(x);
+        std::cout << "\n" << di2 << std::endl;
         test2(di1,di2);
         }
     try
@@ -184,23 +191,27 @@ main()
     error2 & x )
         {
         std::string di1 = current_exception_diagnostic_information();
-        BOOST_TEST(di1==boost::diagnostic_information_what(x));
+        std::cout << __LINE__ << " ------------------\n" << di1;
+        BOOST_TEST(di1 == diagnostic_information_what(x));
         x << tagged_int1(2) << tagged_int2(2);
         std::string di2 = current_exception_diagnostic_information();
-        BOOST_TEST(di2==boost::diagnostic_information_what(x));
+        std::cout << "\n" << di2 << std::endl;
+        BOOST_TEST(di2 == diagnostic_information_what(x));
         test2(di1,di2);
         }
     try
         {
         error3 x;
-        std::string di=diagnostic_information(x);
+        std::string di = diagnostic_information(x);
+        std::cout << __LINE__ << " ------------------\n" << di << std::endl;
         test3(di);
         throw x;
         }
     catch(
     ... )
         {
-        std::string di=current_exception_diagnostic_information();
+        std::string di = current_exception_diagnostic_information();
+        std::cout << __LINE__ << " ------------------\n" << di << std::endl;
         test3(di);
         }
     try
@@ -210,9 +221,10 @@ main()
     catch(
     error4 & x )
         {
-        std::string di1=boost::diagnostic_information(x);
-        std::string wh1=x.what();
-        BOOST_TEST(wh1==di1);
+        std::string di1 = diagnostic_information(x);
+        std::cout << __LINE__ << " ------------------\n" << di1 << std::endl;
+        std::string wh1 = x.what();
+        BOOST_TEST(wh1 == di1);
         }
     try
         {
@@ -222,13 +234,15 @@ main()
     catch(
     error4 & x )
         {
-        std::string di1=boost::diagnostic_information(x);
-        std::string wh1=x.what();
-        BOOST_TEST(wh1==di1);
+        std::string di1 = diagnostic_information(x);
+        std::cout << __LINE__ << " ------------------\n" << di1;
+        std::string wh1 = x.what();
+        BOOST_TEST(wh1 == di1);
         x << tagged_int1(2) << tagged_int2(2);
         std::string di2 = diagnostic_information(x);
-        std::string wh2=x.what();
-        BOOST_TEST(wh2==di2);
+        std::cout << "\n" << di2 << std::endl;
+        std::string wh2 = x.what();
+        BOOST_TEST(wh2 == di2);
         test4(di1,di2);
         }
     try
@@ -239,13 +253,15 @@ main()
     catch(
     error4 & x )
         {
-        std::string di1=boost::current_exception_diagnostic_information();
-        std::string wh1=x.what();
-        BOOST_TEST(wh1==di1);
+        std::string di1 = current_exception_diagnostic_information();
+        std::cout << __LINE__ << " ------------------\n" << di1;
+        std::string wh1 = x.what();
+        BOOST_TEST(wh1 == di1);
         x << tagged_int1(2) << tagged_int2(2);
         std::string di2 = current_exception_diagnostic_information();
-        std::string wh2=x.what();
-        BOOST_TEST(wh2==di2);
+        std::cout << "\n" << di2 << std::endl;
+        std::string wh2 = x.what();
+        BOOST_TEST(wh2 == di2);
         test4(di1,di2);
         }
     return boost::report_errors();

test/exception_ptr_test.cpp

@@ -16,7 +16,7 @@
 #include <boost/function.hpp>
 #include <boost/bind.hpp>
 #include <boost/thread.hpp>
-#include <boost/detail/atomic_count.hpp>
+#include <boost/smart_ptr/detail/atomic_count.hpp>
 #include <boost/detail/lightweight_test.hpp>
 #include <iostream>
 

test/nlohmann_test.cpp

@@ -0,0 +1,148 @@
+//Copyright (c) 2006-2026 Emil Dotchevski and Reverge Studios, Inc.
+
+//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/config.hpp>
+
+#if defined( BOOST_NO_EXCEPTIONS )
+#   error This program requires exception handling.
+#endif
+
+#include <boost/exception/diagnostic_information.hpp>
+#include <boost/exception/serialization/nlohmann_writer.hpp>
+#include <boost/throw_exception.hpp>
+
+#include "nlohmann/json.hpp"
+#include <boost/detail/lightweight_test.hpp>
+#include <iomanip>
+#include <iostream>
+#include <exception>
+
+using output_writer = boost::exception_serialization::nlohmann_writer<nlohmann::ordered_json>;
+
+namespace boost { namespace exception_serialization {
+
+template <class Handle, class E>
+void
+serialize(Handle & h, E const & e, char const * name)
+    {
+    h.dispatch(
+        [&](nlohmann_writer<nlohmann::json> & w) { write_nested(w, e, name); },
+        [&](nlohmann_writer<nlohmann::ordered_json> & w) { write_nested(w, e, name); }
+    );
+    }
+
+} }
+
+struct my_error_tag1;
+struct my_error_tag2;
+
+typedef boost::error_info<my_error_tag1, int> my_error1;
+typedef boost::error_info<my_error_tag2, std::string> my_error2;
+
+struct
+my_info
+    {
+    int code;
+    char const * message;
+
+    template <class Json>
+    friend
+    void
+    to_json(Json & j, my_info const & e)
+        {
+        j["code"] = e.code;
+        j["message"] = e.message;
+        }
+    };
+
+struct my_info_tag;
+typedef boost::error_info<my_info_tag, my_info> my_error3;
+
+struct
+test_exception:
+    virtual boost::exception,
+    virtual std::exception
+    {
+    char const *
+    what() const noexcept override
+        {
+        return "test_exception::what";
+        }
+    };
+
+void
+check_output(nlohmann::ordered_json const & j, bool has_source_location)
+    {
+    if( has_source_location )
+        {
+        BOOST_TEST(j.contains("throw_file"));
+        BOOST_TEST(j.contains("throw_line"));
+        BOOST_TEST(j.contains("throw_function"));
+        }
+#ifndef BOOST_NO_RTTI
+    BOOST_TEST(j.contains("dynamic_exception_type"));
+#endif
+    BOOST_TEST(j.contains("std::exception::what"));
+    BOOST_TEST_EQ(j["std::exception::what"].get<std::string>(), "test_exception::what");
+
+    BOOST_TEST(j.contains("my_error_tag1"));
+    BOOST_TEST_EQ(j["my_error_tag1"].get<int>(), 42);
+
+    BOOST_TEST(j.contains("my_error_tag2"));
+    BOOST_TEST_EQ(j["my_error_tag2"].get<std::string>(), "hello");
+
+    BOOST_TEST(j.contains("my_info_tag"));
+    auto const & mij = j["my_info_tag"];
+    BOOST_TEST_EQ(mij["code"].get<int>(), 1);
+    BOOST_TEST_EQ(mij["message"].get<std::string>(), "error one");
+    }
+
+int
+main()
+    {
+        {
+        std::cout << "Testing write_diagnostic_information_to:\n";
+        nlohmann::ordered_json j;
+        try
+            {
+            test_exception e;
+            e <<
+                my_error1(42) <<
+                my_error2("hello") <<
+                my_error3({1, "error one"});
+            BOOST_THROW_EXCEPTION(e);
+            }
+        catch( test_exception & e )
+            {
+            output_writer w{j};
+            boost::write_diagnostic_information_to(e, w);
+            }
+        std::cout << std::setw(2) << j << std::endl;
+        check_output(j, true);
+        }
+
+        {
+        std::cout << "\nTesting write_current_exception_diagnostic_information_to:\n";
+        nlohmann::ordered_json j;
+        try
+            {
+            test_exception e;
+            e <<
+                my_error1(42) <<
+                my_error2("hello") <<
+                my_error3({1, "error one"});
+            BOOST_THROW_EXCEPTION(e);
+            }
+        catch( ... )
+            {
+            output_writer w{j};
+            boost::write_current_exception_diagnostic_information_to(w);
+            }
+        std::cout << std::setw(2) << j << std::endl;
+        check_output(j, true);
+        }
+
+    return boost::report_errors();
+    }