Merge pull request gabrielkim13#1 from tonuonu/main

make CMake happy if this project is used as a subproject of others

Author: gabrielkim13

CMakeLists.txt

@@ -48,4 +48,11 @@ add_library(
         src/operations/string/substr.cpp
 )
 
+target_include_directories(
+  ${PROJECT_NAME}
+  PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/src/>
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/lib/json/include/nlohmann/>
+)
+
 add_subdirectory(test)