Latest examples depends on range support: C++20 or later required for…

… this project

.github/workflows/ci_tests.yml

@@ -32,17 +32,9 @@ jobs:
           - { id: ubuntu-gcc-dynamic, platform: ubuntu, cc: gcc, cpp: g++, cmake_args: "-DBUILD_SHARED_LIBS=on"}
           - { id: ubuntu-clang-static, platform: ubuntu, cc: clang, cpp: clang++, cmake_args: ""}
           - { id: ubuntu-clang-dynamic, platform: ubuntu, cc: clang, cpp: clang++, cmake_args: "-DBUILD_SHARED_LIBS=on"}
-          # C++98 not supported for Beman.Example. 
-          - { id: ubuntu-gcc-static-cxx11, platform: ubuntu, cc: gcc, cpp: g++, cmake_args: "-DCMAKE_CXX_STANDARD=11 -DCMAKE_CXX_STANDARD_REQUIRED=on"}
-          - { id: ubuntu-gcc-static-cxx14, platform: ubuntu, cc: gcc, cpp: g++, cmake_args: "-DCMAKE_CXX_STANDARD=14 -DCMAKE_CXX_STANDARD_REQUIRED=on"}
-          - { id: ubuntu-gcc-static-cxx17, platform: ubuntu, cc: gcc, cpp: g++, cmake_args: "-DCMAKE_CXX_STANDARD=17 -DCMAKE_CXX_STANDARD_REQUIRED=on"}
           - { id: ubuntu-gcc-static-cxx20, platform: ubuntu, cc: gcc, cpp: g++, cmake_args: "-DCMAKE_CXX_STANDARD=20 -DCMAKE_CXX_STANDARD_REQUIRED=on"}
           - { id: ubuntu-gcc-static-cxx23, platform: ubuntu, cc: gcc, cpp: g++, cmake_args: "-DCMAKE_CXX_STANDARD=23 -DCMAKE_CXX_STANDARD_REQUIRED=on"}
           - { id: ubuntu-gcc-static-cxx26, platform: ubuntu, cc: gcc, cpp: g++, cmake_args: "-DCMAKE_CXX_STANDARD=26 -DCMAKE_CXX_STANDARD_REQUIRED=on"}
-          # C++98 not supported for Beman.Example. 
-          - { id: ubuntu-clang-static-cxx11, platform: ubuntu, cc: clang, cpp: clang++, cmake_args: "-DCMAKE_CXX_STANDARD=11 -DCMAKE_CXX_STANDARD_REQUIRED=on"}
-          - { id: ubuntu-clang-static-cxx14, platform: ubuntu, cc: clang, cpp: clang++, cmake_args: "-DCMAKE_CXX_STANDARD=14 -DCMAKE_CXX_STANDARD_REQUIRED=on"}
-          - { id: ubuntu-clang-static-cxx17, platform: ubuntu, cc: clang, cpp: clang++, cmake_args: "-DCMAKE_CXX_STANDARD=17 -DCMAKE_CXX_STANDARD_REQUIRED=on"}
           - { id: ubuntu-clang-static-cxx20, platform: ubuntu, cc: clang, cpp: clang++, cmake_args: "-DCMAKE_CXX_STANDARD=20 -DCMAKE_CXX_STANDARD_REQUIRED=on"}
           - { id: ubuntu-clang-static-cxx23, platform: ubuntu, cc: clang, cpp: clang++, cmake_args: "-DCMAKE_CXX_STANDARD=23 -DCMAKE_CXX_STANDARD_REQUIRED=on"}
           - { id: ubuntu-clang-static-cxx26, platform: ubuntu, cc: clang, cpp: clang++, cmake_args: "-DCMAKE_CXX_STANDARD=26 -DCMAKE_CXX_STANDARD_REQUIRED=on"}

README.md

@@ -133,7 +133,7 @@ apt-get install                           \
 This project strives to be as normal and simple a CMake project as possible. This build workflow in particular will work, producing a static `libBeman.Example.a` library, ready to package with its headers:
 
 ```shell
-cmake -B build -S .
+cmake -B build -S . -DCMAKE_CXX_STANDARD=20
 cmake --build build
 ctest --test-dir build
 cmake --install build --prefix /opt/Beman.Example
@@ -144,7 +144,7 @@ cmake --install build --prefix /opt/Beman.Example
 
 ```shell
 # Configure example.
-$ cmake -B build -S .
+$ cmake -B build -S . -DCMAKE_CXX_STANDARD=20
 -- The CXX compiler identification is GNU 13.2.0
 -- Detecting CXX compiler ABI info
 -- Detecting CXX compiler ABI info - done