some code experiments

tmp/CMakeLists.txt

@@ -0,0 +1,23 @@
+cmake_minimum_required(VERSION 3.0)
+
+set(CMAKE_CXX_STANDARD          17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS        OFF)
+
+set(CMAKE_OSX_DEPLOYMENT_TARGET "10.14")
+
+
+project(main)
+
+set(PROJECT_NAME main)
+
+include_directories(${CMAKE_SOURCE_DIR}})
+
+set(SOURCE
+	main.cpp)
+
+add_executable(${PROJECT_NAME} ${SOURCE})
+
+target_link_libraries(${PROJECT_NAME} stdc++ m)
+
+target_compile_options(main PRIVATE -g)