diff --git a/.appveyor.yml b/.appveyor.yml
index c080596e..7ffc2fc6 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -31,25 +31,6 @@ environment:
     B2_VARIANT: debug,release
 
   matrix:
-    - FLAVOR: Visual Studio 2008
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      B2_TOOLSET: msvc-9.0
-      B2_ADDRESS_MODEL: 32 # No 64bit support
-
-    - FLAVOR: Visual Studio 2010
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      B2_TOOLSET: msvc-10.0
-      B2_ADDRESS_MODEL: 32 # No 64bit support
-
-    - FLAVOR: Visual Studio 2012
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      B2_TOOLSET: msvc-11.0
-      B2_ADDRESS_MODEL: 32 # No 64bit support
-
-    - FLAVOR: Visual Studio 2013
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      B2_TOOLSET: msvc-12.0
-
     - FLAVOR: Visual Studio 2015
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       B2_TOOLSET: msvc-14.0
@@ -69,13 +50,6 @@ environment:
       B2_CXXSTD: latest
       B2_TOOLSET: msvc-14.1
 
-    - FLAVOR: cygwin (32-bit, C++03)
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      ADDPATH: C:\cygwin\bin;
-      B2_ADDRESS_MODEL: 32
-      B2_CXXSTD: 03
-      B2_TOOLSET: gcc
-
     - FLAVOR: cygwin (32-bit, C++11)
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
       ADDPATH: C:\cygwin\bin;
@@ -97,15 +71,6 @@ environment:
       B2_CXXSTD: 1z
       B2_TOOLSET: gcc
 
-    - FLAVOR: cygwin (64-bit, latest, C++03)
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
-      ADDPATH: C:\cygwin64\bin;
-      B2_ADDRESS_MODEL: 64
-      B2_CXXSTD: 03
-      B2_TOOLSET: gcc
-      B2_FLAGS: "include=libs/unordered/test/unordered include=libs/unordered/test/exception"
-      B2_VARIANT: release
-
     - FLAVOR: cygwin (64-bit, latest, C++11)
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2022
       ADDPATH: C:\cygwin64\bin;
@@ -133,13 +98,6 @@ environment:
       B2_FLAGS: "include=libs/unordered/test/unordered include=libs/unordered/test/exception"
       B2_VARIANT: release
 
-    - FLAVOR: mingw-w64, 32 bit, C++03
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      ADDPATH: C:\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin;
-      B2_CXXSTD: 03
-      B2_TOOLSET: gcc
-      B2_ADDRESS_MODEL: 32
-
     - FLAVOR: mingw-w64, 32 bit, C++11
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       ADDPATH: C:\mingw-w64\i686-8.1.0-posix-dwarf-rt_v6-rev0\mingw32\bin;
@@ -168,13 +126,6 @@ environment:
       B2_TOOLSET: gcc
       B2_ADDRESS_MODEL: 32
 
-    - FLAVOR: mingw-w64, 64 bit, C++03
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      ADDPATH: C:\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin;
-      B2_CXXSTD: 03
-      B2_TOOLSET: gcc
-      B2_ADDRESS_MODEL: 64
-
     - FLAVOR: mingw-w64, 64 bit, C++11
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       ADDPATH: C:\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin;
diff --git a/.drone.jsonnet b/.drone.jsonnet
index 7e3e7115..7386d337 100644
--- a/.drone.jsonnet
+++ b/.drone.jsonnet
@@ -100,40 +100,16 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
 };
 
 [
-    linux_pipeline(
-        "Linux 14.04 GCC 4.4 32/64",
-        "cppalliance/droneubuntu1404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-4.4', CXXSTD: '98,0x', ADDRMD: '32,64' },
-        "g++-4.4-multilib",
-        [ "ppa:ubuntu-toolchain-r/test" ],
-    ),
-
-    linux_pipeline(
-        "Linux 14.04 GCC 4.6 32/64",
-        "cppalliance/droneubuntu1404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-4.6', CXXSTD: '98,0x', ADDRMD: '32,64' },
-        "g++-4.6-multilib",
-        [ "ppa:ubuntu-toolchain-r/test" ],
-    ),
-
-    linux_pipeline(
-        "Linux 14.04 GCC 4.7 32/64",
-        "cppalliance/droneubuntu1404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-4.7', CXXSTD: '98,0x', ADDRMD: '32,64' },
-        "g++-4.7-multilib",
-        [ "ppa:ubuntu-toolchain-r/test" ],
-    ),
-
     linux_pipeline(
         "Linux 14.04 GCC 4.8* 32/64",
         "cppalliance/droneubuntu1404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '11', ADDRMD: '32,64' },
     ),
 
     linux_pipeline(
         "Linux 14.04 GCC 4.9 32/64",
         "cppalliance/droneubuntu1404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-4.9', CXXSTD: '03,11', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++-4.9', CXXSTD: '11', ADDRMD: '32,64' },
         "g++-4.9-multilib",
         [ "ppa:ubuntu-toolchain-r/test" ],
     ),
@@ -141,26 +117,26 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     linux_pipeline(
         "Linux 16.04 GCC 5* 32/64",
         "cppalliance/droneubuntu1604:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11,14', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '11,14', ADDRMD: '32,64' },
     ),
 
     linux_pipeline(
         "Linux 18.04 GCC 6 32/64",
         "cppalliance/droneubuntu1804:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-6', CXXSTD: '03,11,14', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++-6', CXXSTD: '11,14', ADDRMD: '32,64' },
         "g++-6-multilib",
     ),
 
     linux_pipeline(
         "Linux 18.04 GCC 7* 32/64",
         "cppalliance/droneubuntu1804:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11,14,17', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '11,14,17', ADDRMD: '32,64' },
     ),
 
     linux_pipeline(
-        "Linux 18.04 GCC 8 32/64 (03,11)",
+        "Linux 18.04 GCC 8 32/64 (11)",
         "cppalliance/droneubuntu1804:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-8', CXXSTD: '03,11', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++-8', CXXSTD: '11', ADDRMD: '32,64' },
         "g++-8-multilib",
     ),
 
@@ -172,9 +148,9 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 20.04 GCC 9* 32/64 (03,11,14)",
+        "Linux 20.04 GCC 9* 32/64 (11,14)",
         "cppalliance/droneubuntu2004:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11,14', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '11,14', ADDRMD: '32,64' },
     ),
 
     linux_pipeline(
@@ -186,14 +162,14 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     linux_pipeline(
         "Linux 20.04 GCC 9* ARM64",
         "cppalliance/droneubuntu2004:multiarch",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11,14,17,2a' },
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '11,14,17,2a' },
         arch="arm64",
     ),
 
     linux_pipeline(
-        "Linux 20.04 GCC 9* S390x (03,11,14)",
+        "Linux 20.04 GCC 9* S390x (11,14)",
         "cppalliance/droneubuntu2004:multiarch",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11,14' },
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '11,14' },
         arch="s390x",
     ),
 
@@ -205,9 +181,9 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 20.04 GCC 10 32/64 (03,11,14)",
+        "Linux 20.04 GCC 10 32/64 (11,14)",
         "cppalliance/droneubuntu2004:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-10', CXXSTD: '03,11,14', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++-10', CXXSTD: '11,14', ADDRMD: '32,64' },
         "g++-10-multilib",
     ),
 
@@ -219,9 +195,9 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 22.04 GCC 11* 32/64 (03,11,14)",
+        "Linux 22.04 GCC 11* 32/64 (11,14)",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11,14', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '11,14', ADDRMD: '32,64' },
     ),
 
     linux_pipeline(
@@ -231,9 +207,9 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 22.04 GCC 12 32 ASAN (03,11,14)",
+        "Linux 22.04 GCC 12 32 ASAN (11,14)",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-12', CXXSTD: '03,11', ADDRMD: '32' } + asan,
+        { TOOLSET: 'gcc', COMPILER: 'g++-12', CXXSTD: '11', ADDRMD: '32' } + asan,
         "g++-12-multilib",
     ),
 
@@ -266,9 +242,9 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 22.04 GCC 12 64 ASAN (03,11,14)",
+        "Linux 22.04 GCC 12 64 ASAN (11,14)",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-12', CXXSTD: '03,11,14', ADDRMD: '64' } + asan,
+        { TOOLSET: 'gcc', COMPILER: 'g++-12', CXXSTD: '11,14', ADDRMD: '64' } + asan,
         "g++-12-multilib",
     ),
 
@@ -301,9 +277,9 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 23.04 GCC 13 32/64 (03,11,14)",
+        "Linux 23.04 GCC 13 32/64 (11,14)",
         "cppalliance/droneubuntu2304:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-13', CXXSTD: '03,11,14', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++-13', CXXSTD: '11,14', ADDRMD: '32,64' },
         "g++-13 g++-13-multilib",
     ),
 
@@ -317,112 +293,112 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     linux_pipeline(
         "Linux 16.04 Clang 3.5",
         "cppalliance/droneubuntu1604:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-3.5', CXXSTD: '03,11' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-3.5', CXXSTD: '11' },
         "clang-3.5",
     ),
 
     linux_pipeline(
         "Linux 16.04 Clang 3.6",
         "cppalliance/droneubuntu1604:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-3.6', CXXSTD: '03,11,14' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-3.6', CXXSTD: '11,14' },
         "clang-3.6",
     ),
 
     linux_pipeline(
         "Linux 16.04 Clang 3.7",
         "cppalliance/droneubuntu1604:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-3.7', CXXSTD: '03,11,14' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-3.7', CXXSTD: '11,14' },
         "clang-3.7",
     ),
 
     linux_pipeline(
         "Linux 16.04 Clang 3.8",
         "cppalliance/droneubuntu1604:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-3.8', CXXSTD: '03,11,14' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-3.8', CXXSTD: '11,14' },
         "clang-3.8",
     ),
 
     linux_pipeline(
         "Linux 18.04 Clang 3.9",
         "cppalliance/droneubuntu1804:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-3.9', CXXSTD: '03,11,14' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-3.9', CXXSTD: '11,14' },
         "clang-3.9",
     ),
 
     linux_pipeline(
         "Linux 18.04 Clang 4.0",
         "cppalliance/droneubuntu1804:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-4.0', CXXSTD: '03,11,14' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-4.0', CXXSTD: '11,14' },
         "clang-4.0",
     ),
 
     linux_pipeline(
         "Linux 18.04 Clang 5.0",
         "cppalliance/droneubuntu1804:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-5.0', CXXSTD: '03,11,14,1z' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-5.0', CXXSTD: '11,14,1z' },
         "clang-5.0",
     ),
 
     linux_pipeline(
         "Linux 18.04 Clang 6.0",
         "cppalliance/droneubuntu1804:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-6.0', CXXSTD: '03,11,14,17' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-6.0', CXXSTD: '11,14,17' },
         "clang-6.0",
     ),
 
     linux_pipeline(
         "Linux 20.04 Clang 7",
         "cppalliance/droneubuntu2004:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-7', CXXSTD: '03,11,14,17' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-7', CXXSTD: '11,14,17' },
         "clang-7",
     ),
 
     linux_pipeline(
         "Linux 20.04 Clang 8",
         "cppalliance/droneubuntu2004:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-8', CXXSTD: '03,11,14,17' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-8', CXXSTD: '11,14,17' },
         "clang-8",
     ),
 
     linux_pipeline(
         "Linux 20.04 Clang 9",
         "cppalliance/droneubuntu2004:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-9', CXXSTD: '03,11,14,17,2a' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-9', CXXSTD: '11,14,17,2a' },
         "clang-9",
     ),
 
     linux_pipeline(
         "Linux 20.04 Clang 10",
         "cppalliance/droneubuntu2004:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-10', CXXSTD: '03,11,14,17,2a' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-10', CXXSTD: '11,14,17,2a' },
         "clang-10",
     ),
 
     linux_pipeline(
         "Linux 20.04 Clang 11",
         "cppalliance/droneubuntu2004:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-11', CXXSTD: '03,11,14,17,2a' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-11', CXXSTD: '11,14,17,2a' },
         "clang-11",
     ),
 
     linux_pipeline(
         "Linux 20.04 Clang 12",
         "cppalliance/droneubuntu2004:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-12', CXXSTD: '03,11,14,17,2a' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-12', CXXSTD: '11,14,17,2a' },
         "clang-12",
     ),
 
     linux_pipeline(
         "Linux 22.04 Clang 13",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-13', CXXSTD: '03,11,14,17,20' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-13', CXXSTD: '11,14,17,20' },
         "clang-13",
     ),
 
     linux_pipeline(
-        "Linux 22.04 Clang 14 UBSAN (03,11,14)",
+        "Linux 22.04 Clang 14 UBSAN (11,14)",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-14', CXXSTD: '03,11,14' } + ubsan,
+        { TOOLSET: 'clang', COMPILER: 'clang++-14', CXXSTD: '11,14' } + ubsan,
         "clang-14",
     ),
 
@@ -434,9 +410,9 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     ),
 
     linux_pipeline(
-        "Linux 22.04 Clang 14 ASAN (03,11,14)",
+        "Linux 22.04 Clang 14 ASAN (11,14)",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-14', CXXSTD: '03,11,14' } + asan,
+        { TOOLSET: 'clang', COMPILER: 'clang++-14', CXXSTD: '11,14' } + asan,
         "clang-14",
     ),
 
@@ -457,14 +433,14 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     linux_pipeline(
         "Linux 22.04 Clang 15",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-15', CXXSTD: '03,11,14,17,20,2b' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-15', CXXSTD: '11,14,17,20,2b' },
         "clang-15",
         ["deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main"],
     ),
 
     macos_pipeline(
-        "MacOS 10.15 Xcode 12.2 UBSAN (03,11)",
-        { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '03,11' } + ubsan,
+        "MacOS 10.15 Xcode 12.2 UBSAN (11)",
+        { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '11' } + ubsan,
     ),
 
     macos_pipeline(
@@ -479,7 +455,7 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
 
     macos_pipeline(
         "MacOS 12.4 Xcode 13.4.1 ASAN",
-        { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '03,11,14,1z' } + asan,
+        { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '11,14,1z' } + asan,
         xcode_version = "13.4.1", osx_version = "monterey", arch = "arm64",
     ),
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b9c2ef08..19fd945a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -52,65 +52,65 @@ jobs:
       matrix:
         include:
           # Linux, gcc
-          - { compiler: gcc-7,     cxxstd: '03,11,14,17',    os: 'ubuntu-20.04', install: 'g++-7' }
-          - { compiler: gcc-8,     cxxstd: '03,11,14,17',    os: 'ubuntu-20.04', install: 'g++-8' }
-          - { compiler: gcc-9,     cxxstd: '03,11,14,17',    os: 'ubuntu-22.04', install: 'g++-9' }
-          - { compiler: gcc-10,    cxxstd: '03,11,14,17,20', os: 'ubuntu-22.04', install: 'g++-10' }
-          - { compiler: gcc-11,    cxxstd: '03,11,14,17,20', os: 'ubuntu-22.04', install: 'g++-11' }
-          - { name: "gcc-12 w/ sanitizers (03,11)", sanitize: yes,
-              compiler: gcc-12,    cxxstd: '03,11',          os: 'ubuntu-22.04', ccache_key: "san1" }
+          - { compiler: gcc-7,     cxxstd: '11,14,17',    os: 'ubuntu-20.04', install: 'g++-7' }
+          - { compiler: gcc-8,     cxxstd: '11,14,17',    os: 'ubuntu-20.04', install: 'g++-8' }
+          - { compiler: gcc-9,     cxxstd: '11,14,17',    os: 'ubuntu-22.04', install: 'g++-9' }
+          - { compiler: gcc-10,    cxxstd: '11,14,17,20', os: 'ubuntu-22.04', install: 'g++-10' }
+          - { compiler: gcc-11,    cxxstd: '11,14,17,20', os: 'ubuntu-22.04', install: 'g++-11' }
+          - { name: "gcc-12 w/ sanitizers (11)", sanitize: yes,
+              compiler: gcc-12,    cxxstd: '11',          os: 'ubuntu-22.04', ccache_key: "san1" }
           - { name: "gcc-12 w/ sanitizers (14)", sanitize: yes,
-              compiler: gcc-12,    cxxstd: '14',             os: 'ubuntu-22.04', ccache_key: "san1" }
+              compiler: gcc-12,    cxxstd: '14',          os: 'ubuntu-22.04', ccache_key: "san1" }
           - { name: "gcc-12 w/ sanitizers (17)", sanitize: yes,
-              compiler: gcc-12,    cxxstd: '17',             os: 'ubuntu-22.04', ccache_key: "san2" }
+              compiler: gcc-12,    cxxstd: '17',          os: 'ubuntu-22.04', ccache_key: "san2" }
           - { name: "gcc-12 w/ sanitizers (20)", sanitize: yes,
-              compiler: gcc-12,    cxxstd: '20',             os: 'ubuntu-22.04', ccache_key: "san2" }
+              compiler: gcc-12,    cxxstd: '20',          os: 'ubuntu-22.04', ccache_key: "san2" }
           - { name: "gcc-12 w/ sanitizers (2b)", sanitize: yes,
-              compiler: gcc-12,    cxxstd: '2b',             os: 'ubuntu-22.04', ccache_key: "san2" }
+              compiler: gcc-12,    cxxstd: '2b',          os: 'ubuntu-22.04', ccache_key: "san2" }
           - { name: Collect coverage, coverage: yes,
-              compiler: gcc-12,     cxxstd: '03,20',          os: 'ubuntu-22.04', install: 'g++-12-multilib', address-model: '32,64', ccache_key: "cov" }
+              compiler: gcc-12,    cxxstd: '20',          os: 'ubuntu-22.04', install: 'g++-12-multilib', address-model: '32,64', ccache_key: "cov" }
 
           - { name: "cfoa tsan (gcc-12)", cxxstd: '11,14,17,20,2b', os: 'ubuntu-22.04', compiler: gcc-12,
               targets: 'libs/unordered/test//cfoa_tests', thread-sanitize: yes, ccache_key: "tsan" }
 
           # Linux, clang, libc++
-          - { compiler: clang-7,   cxxstd: '03,11,14,17',       os: 'ubuntu-20.04', stdlib: libc++, install: 'clang-7 libc++-7-dev libc++abi-7-dev' }
-          - { compiler: clang-10,  cxxstd: '03,11,14,17,20',    os: 'ubuntu-20.04', stdlib: libc++, install: 'clang-10 libc++-10-dev libc++abi-10-dev' }
-          - { compiler: clang-11,  cxxstd: '03,11,14,17,20',    os: 'ubuntu-22.04', stdlib: libc++, install: 'clang-11 libc++-11-dev libc++abi-11-dev' }
+          - { compiler: clang-7,    cxxstd: '11,14,17',    os: 'ubuntu-20.04', stdlib: libc++, install: 'clang-7 libc++-7-dev libc++abi-7-dev' }
+          - { compiler: clang-10,   cxxstd: '11,14,17,20', os: 'ubuntu-20.04', stdlib: libc++, install: 'clang-10 libc++-10-dev libc++abi-10-dev' }
+          - { compiler: clang-11,   cxxstd: '11,14,17,20', os: 'ubuntu-22.04', stdlib: libc++, install: 'clang-11 libc++-11-dev libc++abi-11-dev' }
           # clang-12 doesn't work on 'ubuntu-22.04', the linker can't find -lunwind for some reason
-          - { name: "clang-12 w/ sanitizers (03,11,14)", sanitize: yes,
-              compiler: clang-12,  cxxstd: '03,11,14',          os: 'ubuntu-20.04', stdlib: libc++, install: 'clang-12 libc++-12-dev libc++abi-12-dev', ccache_key: "san1" }
+          - { name: "clang-12 w/ sanitizers (11,14)", sanitize: yes,
+              compiler: clang-12,   cxxstd: '11,14',       os: 'ubuntu-20.04', stdlib: libc++, install: 'clang-12 libc++-12-dev libc++abi-12-dev', ccache_key: "san1" }
           - { name: "clang-12 w/ sanitizers (17)", sanitize: yes,
-              compiler: clang-12,  cxxstd: '17',          os: 'ubuntu-20.04', stdlib: libc++, install: 'clang-12 libc++-12-dev libc++abi-12-dev', ccache_key: "san2" }
+              compiler: clang-12,   cxxstd: '17',          os: 'ubuntu-20.04', stdlib: libc++, install: 'clang-12 libc++-12-dev libc++abi-12-dev', ccache_key: "san2" }
           - { name: "clang-12 w/ sanitizers (20)", sanitize: yes,
-              compiler: clang-12,  cxxstd: '20',          os: 'ubuntu-20.04', stdlib: libc++, install: 'clang-12 libc++-12-dev libc++abi-12-dev', ccache_key: "san2" }
+              compiler: clang-12,   cxxstd: '20',          os: 'ubuntu-20.04', stdlib: libc++, install: 'clang-12 libc++-12-dev libc++abi-12-dev', ccache_key: "san2" }
           - { name: "clang-12 w/ sanitizers (2b)", sanitize: yes,
-              compiler: clang-12,  cxxstd: '2b',          os: 'ubuntu-20.04', stdlib: libc++, install: 'clang-12 libc++-12-dev libc++abi-12-dev', ccache_key: "san2" }
-          - { compiler: 'clang-13',  cxxstd: '03,11,14', os: 'ubuntu-22.04', stdlib: libc++, install: 'clang-13 libc++-13-dev libc++abi-13-dev' }
-          - { compiler: 'clang-13',  cxxstd: '17,20,2b', os: 'ubuntu-22.04', stdlib: libc++, install: 'clang-13 libc++-13-dev libc++abi-13-dev' }
+              compiler: clang-12,   cxxstd: '2b',          os: 'ubuntu-20.04', stdlib: libc++, install: 'clang-12 libc++-12-dev libc++abi-12-dev', ccache_key: "san2" }
+          - { compiler: 'clang-13', cxxstd: '11,14',       os: 'ubuntu-22.04', stdlib: libc++, install: 'clang-13 libc++-13-dev libc++abi-13-dev' }
+          - { compiler: 'clang-13', cxxstd: '17,20,2b',    os: 'ubuntu-22.04', stdlib: libc++, install: 'clang-13 libc++-13-dev libc++abi-13-dev' }
 
           # not using libc++ because of https://github.com/llvm/llvm-project/issues/52771
-          - { name: "clang-14 w/ sanitizers (03,11,14)", sanitize: yes,
-              compiler: clang-14,  cxxstd: '03,11,14',          os: 'ubuntu-22.04', ccache_key: "san1" }
+          - { name: "clang-14 w/ sanitizers (11,14)", sanitize: yes,
+              compiler: clang-14,  cxxstd: '11,14', os: 'ubuntu-22.04', ccache_key: "san1" }
           - { name: "clang-14 w/ sanitizers (17)", sanitize: yes,
-              compiler: clang-14,  cxxstd: '17',          os: 'ubuntu-22.04', ccache_key: "san2" }
+              compiler: clang-14,  cxxstd: '17',    os: 'ubuntu-22.04', ccache_key: "san2" }
           - { name: "clang-14 w/ sanitizers (20)", sanitize: yes,
-              compiler: clang-14,  cxxstd: '20',          os: 'ubuntu-22.04', ccache_key: "san2" }
+              compiler: clang-14,  cxxstd: '20',    os: 'ubuntu-22.04', ccache_key: "san2" }
           - { name: "clang-14 w/ sanitizers (2b)", sanitize: yes,
-              compiler: clang-14,  cxxstd: '2b',          os: 'ubuntu-22.04', ccache_key: "san2" }
+              compiler: clang-14,  cxxstd: '2b',    os: 'ubuntu-22.04', ccache_key: "san2" }
 
           - { name: "cfoa tsan (clang-14)", cxxstd: '11,14,17,20,2b', os: 'ubuntu-22.04', compiler: clang-14,
               targets: 'libs/unordered/test//cfoa_tests', thread-sanitize: yes, 
               stdlib: libc++, install: 'clang-14 libc++-14-dev libc++abi-14-dev', ccache_key: "tsan" }
 
-          - { compiler: 'clang-15',  cxxstd: '03,11,14', os: 'ubuntu-22.04', stdlib: libc++, install: 'clang-15 libc++-15-dev libc++abi-15-dev' }
-          - { compiler: 'clang-15',  cxxstd: '17,20,2b', os: 'ubuntu-22.04', stdlib: libc++, install: 'clang-15 libc++-15-dev libc++abi-15-dev' }
+          - { compiler: 'clang-15', cxxstd: '11,14',    os: 'ubuntu-22.04', stdlib: libc++, install: 'clang-15 libc++-15-dev libc++abi-15-dev' }
+          - { compiler: 'clang-15', cxxstd: '17,20,2b', os: 'ubuntu-22.04', stdlib: libc++, install: 'clang-15 libc++-15-dev libc++abi-15-dev' }
 
           # OSX, clang
-          - { compiler: clang,     cxxstd: '03,11,14,17,2a',    os: 'macos-11' }
-          - { compiler: clang,     cxxstd: '03,11,14,17,2a',    os: 'macos-12', sanitize: yes, ccache_key: "san1" }
-          - { compiler: clang,     cxxstd: '11,14,17,2a',       os: 'macos-12', thread-sanitize: yes, targets: 'libs/unordered/test//cfoa_tests', ccache_key: "tsan" }
-          - { compiler: clang,     cxxstd: '03,11,14,17,20,2b', os: 'macos-13' }
+          - { compiler: clang, cxxstd: '11,14,17,2a',    os: 'macos-11' }
+          - { compiler: clang, cxxstd: '11,14,17,2a',    os: 'macos-12', sanitize: yes, ccache_key: "san1" }
+          - { compiler: clang, cxxstd: '11,14,17,2a',    os: 'macos-12', thread-sanitize: yes, targets: 'libs/unordered/test//cfoa_tests', ccache_key: "tsan" }
+          - { compiler: clang, cxxstd: '11,14,17,20,2b', os: 'macos-13' }
 
     timeout-minutes: 360
     # posix (gcc-12 w/ sanitizers is taking longer than 210 minutes
@@ -266,7 +266,7 @@ jobs:
           - { toolset: msvc-14.3, cxxstd: '14',              addrmd: '64',    os: 'windows-2022', variant: 'debug', defines: '_ALLOW_RTCc_IN_STL', cxxflags: '/RTCc'              }
           - { toolset: msvc-14.3, cxxstd: '14',              addrmd: '32',    os: 'windows-2022', variant: 'debug', defines: '_ALLOW_RTCc_IN_STL', cxxflags: '"/RTCc /arch:IA32"' }
           - { toolset: clang-win, cxxstd: '14,17,latest',    addrmd: '32,64', os: 'windows-2022', variant: 'debug,release' }
-          - { toolset: gcc,       cxxstd: '03,11,14,17,2a',  addrmd: '64',    os: 'windows-2019', variant: 'debug,release' }
+          - { toolset: gcc,       cxxstd: '11,14,17,2a',     addrmd: '64',    os: 'windows-2019', variant: 'debug,release' }
 
     needs: [runner-selection]
     runs-on: ${{ fromJSON(needs.runner-selection.outputs.labelmatrix)[matrix.os] }}
@@ -323,8 +323,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - { sys: MINGW32, compiler: gcc, cxxstd: '03,11,17,20' }
-          - { sys: MINGW64, compiler: gcc, cxxstd: '03,11,17,20' }
+          - { sys: MINGW32, compiler: gcc, cxxstd: '11,17,20' }
+          - { sys: MINGW64, compiler: gcc, cxxstd: '11,17,20' }
 
     needs: [runner-selection]
     runs-on: ${{ fromJSON(needs.runner-selection.outputs.labelmatrix)['windows-latest'] }}
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index 3a2edc4a..929d59a4 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -20,20 +20,6 @@ local msvc-flags = /wd4494 ;
 
 project
     : requirements
-        [ requires cxx11_rvalue_references
-                   cxx11_auto_declarations
-                   cxx11_nullptr
-                   cxx11_defaulted_functions
-                   cxx11_final
-                   cxx11_hdr_initializer_list
-                   cxx11_static_assert
-                   cxx11_smart_ptr
-                   cxx11_constexpr
-                   cxx11_noexcept
-                   cxx11_decltype
-                   cxx11_thread_local
-        ]
-
         <warnings>pedantic
         <toolset>intel:<warnings>on