Some modifications for Beman standard conformance

.gitmodules

@@ -1,6 +1,3 @@
 [submodule "papers/wg21"]
 	path = papers/P2988/wg21
 	url = https://github.com/mpark/wg21.git
-[submodule "extern/googletest"]
-	path = extern/googletest
-	url = https://github.com/google/googletest.git

CMakeLists.txt

@@ -2,12 +2,14 @@ cmake_minimum_required(VERSION 3.10)
 
 project(beman_iter_interface VERSION 0.0.0 LANGUAGES CXX)
 
+include(FetchContent)
+
 enable_testing()
 
 set(TARGETS_EXPORT_NAME ${CMAKE_PROJECT_NAME}Targets)
 
 add_subdirectory(extern)
-add_subdirectory(src)
+add_subdirectory(src/beman/iterator_interface26)
 add_subdirectory(examples)
 
 include(GNUInstallDirs)

examples/CMakeLists.txt

@@ -1,5 +1,3 @@
-set(BEMAN_ITERATOR_LIBRARY "beman_iterator")
-
 include(GNUInstallDirs)
 
 # List of all buildable examples.
@@ -19,7 +17,7 @@ foreach(EXAMPLE ${EXAMPLES})
   )
 
   # Link example with the library.
-  target_link_libraries(${EXAMPLE} "${BEMAN_ITERATOR_LIBRARY}")
+  target_link_libraries(${EXAMPLE} beman.iterator_interface26)
 
   # Install .
   install(

examples/sample.cpp

@@ -1,4 +1,4 @@
-#include <Beman/iterator/iterator_interface.hpp>
+#include <beman/iterator_interface26/iterator_interface.hpp>
 #include <iostream>
 
 int main() {

extern/CMakeLists.txt

@@ -1 +1,15 @@
-add_subdirectory(googletest EXCLUDE_FROM_ALL)
+if(BUILD_TESTING)
+    # Fetch GoogleTest
+    FetchContent_Declare(
+        googletest
+        GIT_REPOSITORY https://github.com/google/googletest.git
+        GIT_TAG
+            f8d7d77c06936315286eb55f8de22cd23c188571 # release-1.14.0
+        EXCLUDE_FROM_ALL
+    )
+    block()
+        set(INSTALL_GTEST OFF) # Disable GoogleTest installation
+        set(BUILD_TESTING OFF) # Disable GoogleTest tests
+        FetchContent_MakeAvailable(googletest)
+    endblock()
+endif()

src/Beman/iterator/iterator_interface.hpp → include/beman/iterator_interface26/iterator_interface.hpp

@@ -6,8 +6,8 @@
 #include <type_traits>
 #include <iterator>
 
-namespace Beman {
-namespace iterator {
+namespace beman {
+namespace iterator_interface26 {
 
 using std::conditional_t;
 using std::convertible_to;

src/beman/iterator_interface26/CMakeLists.txt

@@ -0,0 +1,50 @@
+add_library(beman.iterator_interface26)
+add_library(beman::iterator_interface26 ALIAS beman.iterator_interface26)
+
+target_sources(
+  beman.iterator_interface26
+  PRIVATE
+  iterator_interface.cpp
+)
+
+include(GNUInstallDirs)
+include_directories(${CMAKE_CURRENT_SOURCE_DIR})
+
+target_include_directories(beman.iterator_interface26 PUBLIC
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../../../include>
+  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/${CMAKE_LOWER_PROJECT_NAME}>  # <prefix>/include/scratch
+)
+
+install(
+  TARGETS beman.iterator_interface26
+  EXPORT ${TARGETS_EXPORT_NAME}1
+  DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
+
+string(TOLOWER ${CMAKE_PROJECT_NAME} CMAKE_LOWER_PROJECT_NAME)
+
+install(
+  DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/
+  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${CMAKE_LOWER_PROJECT_NAME}
+  FILES_MATCHING PATTERN "*.hpp"
+)
+
+target_link_libraries(beman.iterator_interface26)
+
+## Tests
+if(BUILD_TESTING)
+    add_executable(iterator_interface_test "")
+
+    target_sources(
+      iterator_interface_test
+      PRIVATE
+      iterator_interface.t.cpp
+    )
+
+    target_link_libraries(iterator_interface_test beman.iterator_interface26)
+    target_link_libraries(iterator_interface_test GTest::gtest)
+    target_link_libraries(iterator_interface_test GTest::gtest_main)
+
+    include(GoogleTest)
+    gtest_discover_tests(iterator_interface_test)
+endif()

src/beman/iterator_interface26/iterator_interface.cpp

@@ -0,0 +1 @@
+#include <beman/iterator_interface26/iterator_interface.hpp>

src/Beman/iterator/iterator_interface.t.cpp → src/beman/iterator_interface26/iterator_interface.t.cpp

@@ -1,13 +1,13 @@
 // iterator_interface.t.cpp                                           -*-C++-*-
-#include <Beman/iterator/iterator_interface.hpp>
-#include <Beman/iterator/iterator_interface.hpp>
+#include <beman/iterator_interface26/iterator_interface.hpp>
+#include <beman/iterator_interface26/iterator_interface.hpp>
 
 #include <gtest/gtest.h>
 
 #include <ranges>
 
-namespace Beman {
-namespace iterator {
+namespace beman {
+namespace iterator_interface26 {
 
 namespace {} // namespace