diff --git a/.drone.jsonnet b/.drone.jsonnet
index e6a63b9..19ae94c 100644
--- a/.drone.jsonnet
+++ b/.drone.jsonnet
@@ -98,40 +98,16 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
 };
 
 [
-    linux_pipeline(
-        "Linux 14.04 GCC 4.4",
-        "cppalliance/droneubuntu1404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-4.4', CXXSTD: '98,0x' },
-        "g++-4.4",
-        [ "ppa:ubuntu-toolchain-r/test" ],
-    ),
-
-    linux_pipeline(
-        "Linux 14.04 GCC 4.6",
-        "cppalliance/droneubuntu1404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-4.6', CXXSTD: '98,0x' },
-        "g++-4.6",
-        [ "ppa:ubuntu-toolchain-r/test" ],
-    ),
-
-    linux_pipeline(
-        "Linux 14.04 GCC 4.7",
-        "cppalliance/droneubuntu1404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-4.7', CXXSTD: '98,0x' },
-        "g++-4.7",
-        [ "ppa:ubuntu-toolchain-r/test" ],
-    ),
-
     linux_pipeline(
         "Linux 14.04 GCC 4.8*",
         "cppalliance/droneubuntu1404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11' },
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '11' },
     ),
 
     linux_pipeline(
         "Linux 14.04 GCC 4.9",
         "cppalliance/droneubuntu1404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-4.9', CXXSTD: '03,11' },
+        { TOOLSET: 'gcc', COMPILER: 'g++-4.9', CXXSTD: '11' },
         "g++-4.9",
         [ "ppa:ubuntu-toolchain-r/test" ],
     ),
@@ -139,277 +115,277 @@ local windows_pipeline(name, image, environment, arch = "amd64") =
     linux_pipeline(
         "Linux 16.04 GCC 5*",
         "cppalliance/droneubuntu1604:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11,14' },
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '11,14' },
     ),
 
     linux_pipeline(
         "Linux 18.04 GCC 6",
         "cppalliance/droneubuntu1804:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-6', CXXSTD: '03,11,14' },
+        { TOOLSET: 'gcc', COMPILER: 'g++-6', CXXSTD: '11,14' },
         "g++-6",
     ),
 
     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",
         "cppalliance/droneubuntu1804:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-8', CXXSTD: '03,11,14,17', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++-8', CXXSTD: '11,14,17', ADDRMD: '32,64' },
         "g++-8-multilib",
     ),
 
     linux_pipeline(
         "Linux 20.04 GCC 9* 32/64",
         "cppalliance/droneubuntu2004:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11,14,17,2a', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '11,14,17,2a', ADDRMD: '32,64' },
     ),
 
     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",
         "cppalliance/droneubuntu2004:multiarch",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11,14,17,2a' },
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '11,14,17,2a' },
         arch="s390x",
     ),
 
     linux_pipeline(
         "Linux 20.04 GCC 10 32/64",
         "cppalliance/droneubuntu2004:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-10', CXXSTD: '03,11,14,17,20', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++-10', CXXSTD: '11,14,17,20', ADDRMD: '32,64' },
         "g++-10-multilib",
     ),
 
     linux_pipeline(
         "Linux 22.04 GCC 11* 32/64",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '03,11,14,17,2a', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++', CXXSTD: '11,14,17,2a', ADDRMD: '32,64' },
     ),
 
     linux_pipeline(
         "Linux 22.04 GCC 12 32/64",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-12', CXXSTD: '03,11,14,17,20,2b', ADDRMD: '32,64' },
+        { TOOLSET: 'gcc', COMPILER: 'g++-12', CXXSTD: '11,14,17,20,2b', ADDRMD: '32,64' },
         "g++-12-multilib",
     ),
 
     linux_pipeline(
         "Linux 23.04 GCC 13 32 ASAN",
         "cppalliance/droneubuntu2304:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-13', CXXSTD: '03,11,14,17,20,2b', ADDRMD: '32' } + asan,
+        { 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",
         "cppalliance/droneubuntu2304:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-13', CXXSTD: '03,11,14,17,20,2b', ADDRMD: '32' } + ubsan,
+        { 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",
         "cppalliance/droneubuntu2304:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-13', CXXSTD: '03,11,14,17,20,2b', ADDRMD: '64' } + ubsan,
+        { TOOLSET: 'gcc', COMPILER: 'g++-13', CXXSTD: '11,14,17,20,2b', ADDRMD: '64' } + ubsan,
         "g++-13-multilib",
     ),
 
     linux_pipeline(
         "Linux 24.04 GCC 14 UBSAN",
         "cppalliance/droneubuntu2404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-14', CXXSTD: '03,11,14,17,20,2b' } + ubsan,
+        { TOOLSET: 'gcc', COMPILER: 'g++-14', CXXSTD: '11,14,17,20,2b' } + ubsan,
         "g++-14-multilib",
     ),
 
     linux_pipeline(
         "Linux 24.04 GCC 14 ASAN",
         "cppalliance/droneubuntu2404:1",
-        { TOOLSET: 'gcc', COMPILER: 'g++-14', CXXSTD: '03,11,14,17,20,2b' } + asan,
+        { TOOLSET: 'gcc', COMPILER: 'g++-14', CXXSTD: '11,14,17,20,2b' } + asan,
         "g++-14-multilib",
     ),
 
     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' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-5.0', CXXSTD: '11,14' },
         "clang-5.0",
     ),
 
     linux_pipeline(
         "Linux 20.04 Clang 6.0",
         "cppalliance/droneubuntu2004:1",
-        { 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: '03,11,14,17,20' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-12', CXXSTD: '11,14,17,20' },
         "clang-12",
     ),
 
     linux_pipeline(
         "Linux 22.04 Clang 13",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-13', CXXSTD: '03,11,14,17,20,2b' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-13', CXXSTD: '11,14,17,20,2b' },
         "clang-13",
     ),
 
     linux_pipeline(
         "Linux 22.04 Clang 14",
         "cppalliance/droneubuntu2204:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-14', CXXSTD: '03,11,14,17,20,2b' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-14', CXXSTD: '11,14,17,20,2b' },
         "clang-14",
     ),
 
     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",
     ),
 
     linux_pipeline(
         "Linux 23.04 Clang 16",
         "cppalliance/droneubuntu2304:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-16', CXXSTD: '03,11,14,17,20,2b' },
+        { TOOLSET: 'clang', COMPILER: 'clang++-16', CXXSTD: '11,14,17,20,2b' },
         "clang-16",
     ),
 
     linux_pipeline(
         "Linux 23.10 Clang 17 UBSAN",
         "cppalliance/droneubuntu2310:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-17', CXXSTD: '03,11,14,17,20,2b' } + ubsan,
+        { TOOLSET: 'clang', COMPILER: 'clang++-17', CXXSTD: '11,14,17,20,2b' } + ubsan,
         "clang-17",
     ),
 
     linux_pipeline(
         "Linux 23.10 Clang 17 ASAN",
         "cppalliance/droneubuntu2310:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-17', CXXSTD: '03,11,14,17,20,2b' } + asan,
+        { TOOLSET: 'clang', COMPILER: 'clang++-17', CXXSTD: '11,14,17,20,2b' } + asan,
         "clang-17",
     ),
 
     linux_pipeline(
         "Linux 24.04 Clang 18 UBSAN",
         "cppalliance/droneubuntu2404:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-18', CXXSTD: '03,11,14,17,20,2b' } + ubsan,
+        { TOOLSET: 'clang', COMPILER: 'clang++-18', CXXSTD: '11,14,17,20,2b' } + ubsan,
         "clang-18",
     ),
 
     linux_pipeline(
         "Linux 24.04 Clang 18 ASAN",
         "cppalliance/droneubuntu2404:1",
-        { TOOLSET: 'clang', COMPILER: 'clang++-18', CXXSTD: '03,11,14,17,20,2b' } + asan,
+        { TOOLSET: 'clang', COMPILER: 'clang++-18', CXXSTD: '11,14,17,20,2b' } + asan,
         "clang-18",
     ),
 
     macos_pipeline(
         "MacOS 10.15 Xcode 12.2 UBSAN",
-        { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '03,11,14,1z' } + ubsan,
+        { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '11,14,1z' } + ubsan,
     ),
 
     macos_pipeline(
         "MacOS 10.15 Xcode 12.2 ASAN",
-        { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '03,11,14,1z' } + asan,
+        { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '11,14,1z' } + asan,
     ),
 
     macos_pipeline(
         "MacOS 12.4 Xcode 13.4.1 UBSAN",
-        { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '03,11,14,17,20,2b' } + ubsan,
+        { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '11,14,17,20,2b' } + ubsan,
         xcode_version = "13.4.1", osx_version = "monterey", arch = "arm64",
     ),
 
     macos_pipeline(
         "MacOS 12.4 Xcode 13.4.1 ASAN",
-        { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '03,11,14,17,20,2b' } + asan,
+        { TOOLSET: 'clang', COMPILER: 'clang++', CXXSTD: '11,14,17,20,2b' } + asan,
         xcode_version = "13.4.1", osx_version = "monterey", arch = "arm64",
     ),
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a97f6ce..0c074ef 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,160 +18,160 @@ 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
           - 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
           - 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
           - 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
           - 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
           - toolset: gcc-11
-            cxxstd: "03,11,14,17,20"
+            cxxstd: "11,14,17,20"
             os: ubuntu-22.04
             install: g++-11-multilib
             address-model: 32,64
           - toolset: gcc-12
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             os: ubuntu-22.04
             install: g++-12-multilib
             address-model: 32,64
           - toolset: gcc-13
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             os: ubuntu-latest
             container: ubuntu:23.04
             install: g++-13-multilib
             address-model: 32,64
           - toolset: gcc-14
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             os: ubuntu-latest
             container: ubuntu:24.04
             install: g++-14-multilib
             address-model: 32,64
           - 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: "11,14,17,2a"
             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"
+            cxxstd: "11,14,17,20,2b"
             container: ubuntu:23.04
             os: ubuntu-latest
             install: clang-16
           - toolset: clang
             compiler: clang++-17
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             container: ubuntu:23.10
             os: ubuntu-latest
             install: clang-17
           - toolset: clang
             compiler: clang++-18
-            cxxstd: "03,11,14,17,20,2b"
+            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"
+            cxxstd: "11,14,17,20,2b"
             os: macos-12
           - toolset: clang
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             os: macos-13
           - toolset: clang
-            cxxstd: "03,11,14,17,20,2b"
+            cxxstd: "11,14,17,20,2b"
             os: macos-14
 
     runs-on: ${{matrix.os}}
@@ -254,7 +254,7 @@ jobs:
             addrmd: 32,64
             os: windows-2022
           - toolset: gcc
-            cxxstd: "03,11,14,17,2a"
+            cxxstd: "11,14,17,2a"
             addrmd: 64
             os: windows-2019
 
diff --git a/appveyor.yml b/appveyor.yml
index dce3c64..1822405 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -14,18 +14,6 @@ branches:
 
 environment:
   matrix:
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      TOOLSET: msvc-9.0
-      ADDRMD: 32
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      TOOLSET: msvc-10.0
-      ADDRMD: 32
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      TOOLSET: msvc-11.0
-      ADDRMD: 32
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      TOOLSET: msvc-12.0
-      ADDRMD: 32,64
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       TOOLSET: msvc-14.0
       ADDRMD: 32,64
@@ -40,19 +28,19 @@ environment:
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\cygwin\bin;
       TOOLSET: gcc
-      CXXSTD: 03,11,14,1z
+      CXXSTD: 11,14,1z
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\cygwin64\bin;
       TOOLSET: gcc
-      CXXSTD: 03,11,14,1z
+      CXXSTD: 11,14,1z
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\mingw\bin;
       TOOLSET: gcc
-      CXXSTD: 03,11,14,1z
+      CXXSTD: 11,14,1z
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
       ADDPATH: C:\mingw-w64\x86_64-7.2.0-posix-seh-rt_v5-rev1\mingw64\bin;
       TOOLSET: gcc
-      CXXSTD: 03,11,14,1z
+      CXXSTD: 11,14,1z
 
 install:
   - set BOOST_BRANCH=develop