使用Cmake创建一个head only的库（未完待续）

In the CMake script you provided, the second parameter of the add_library() function is an empty string "". This is a common pattern used in CMake to create an "interface-only" library or a header-only library.

以下是示例

add_library(conversion "")

target_sources(conversion
  PRIVATE
    ${CMAKE_CURRENT_LIST_DIR}/conversion.cpp
  PUBLIC
    ${CMAKE_CURRENT_LIST_DIR}/conversion.hpp
  )

target_include_directories(conversion
  PUBLIC
  	${CMAKE_CURRENT_LIST_DIR}
  )

该项目的目录结构:

.
├── CMakeLists.txt
├── external
│    ├── CMakeLists.txt
│    ├── conversion.cpp
│    ├── conversion.hpp
│    └── README.md
├── src
│    ├── CMakeLists.txt
│    ├── evolution
│    │    ├── CMakeLists.txt
│    │    ├── evolution.cpp
│    │    └── evolution.hpp
│    ├── initial
│    │    ├── CMakeLists.txt
│    │    ├── initial.cpp
│    │    └── initial.hpp
│    ├── io
│    │    ├── CMakeLists.txt
│    │    ├── io.cpp
│    │    └── io.hpp
│    ├── main.cpp
│    └── parser
│        ├── CMakeLists.txt
│        ├── parser.cpp
│        └── parser.hpp
└── tests
    ├── catch.hpp
    ├── CMakeLists.txt
    └── test.cpp