Get the basic file framework up

01_foundation/CMakeLists.txt

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+add_executable(01_main main.cpp)

01_foundation/main.cpp

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+#include <iostream>
+int main() {
+  std::cout << "Hello World\n";
+}

02_foundation/CMakeLists.txt

@@ -0,0 +1 @@
+add_executable(02_main main.cpp)

02_foundation/main.cpp

@@ -0,0 +1,4 @@
+#include <iostream>
+int main() {
+  std::cout << "Hello World\n";
+}

11_intermediate/CMakeLists.txt

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+add_executable(11_main main.cpp)

11_intermediate/main.cpp

@@ -0,0 +1,4 @@
+#include <iostream>
+int main() {
+  std::cout << "Hello World\n";
+}

CMakeLists.txt

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+if (NOT APPLE AND NOT WIN32)
+    set(CMAKE_TOOLCHAIN_FILE toolchains/linux_clang_11.cmake)
+endif ()
+
+cmake_minimum_required(VERSION 3.10)
+project(modern_cpp C CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS NO)
+
+include_directories(include)
+
+add_subdirectory(01_foundation)
+add_subdirectory(02_foundation)
+add_subdirectory(11_intermediate)

toolchains/linux_clang_11.cmake

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+SET(CMAKE_C_COMPILER clang-11)
+SET(CMAKE_CXX_COMPILER clang++-11)