add version string

Author: facontidavide

CMakeLists.txt

@@ -1,5 +1,6 @@
 cmake_minimum_required(VERSION 3.16.3) # version on Ubuntu Focal
-project(behaviortree_cpp)
+
+project(behaviortree_cpp VERSION 4.1.1)
 
 set(CMAKE_CONFIG_PATH ${CMAKE_MODULE_PATH}  "${CMAKE_CURRENT_LIST_DIR}/cmake")
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CONFIG_PATH}")
@@ -175,6 +176,7 @@ target_include_directories(${BTCPP_LIBRARY}
     )
 
 target_compile_definitions(${BTCPP_LIBRARY} PRIVATE $<$<CONFIG:Debug>:TINYXML2_DEBUG>)
+target_compile_definitions(${BTCPP_LIBRARY} PUBLIC BTCPP_LIBRARY_VERSION="${CMAKE_PROJECT_VERSION}")
 
 if(MSVC)
 else()

include/behaviortree_cpp/behavior_tree.h

@@ -90,4 +90,11 @@ inline NodeType getType()
   // clang-format on
 }
 
+
+inline const char* LibraryVersionString() {
+  return BTCPP_LIBRARY_VERSION;
+}
+
+int LibraryVersionNumber();
+
 }   // namespace BT

src/behavior_tree.cpp

@@ -111,4 +111,15 @@ void buildSerializedStatusSnapshot(TreeNode* root_node,
   applyRecursiveVisitor(root_node, visitor);
 }
 
+int LibraryVersionNumber() {
+  static int number = -1;
+  if(number == -1) {
+    auto const parts = splitString(BTCPP_LIBRARY_VERSION, '.');
+    number = std::stoi( std::string(parts[0]) ) * 10000 +
+             std::stoi( std::string(parts[1]) ) * 100 +
+             std::stoi( std::string(parts[2]));
+  }
+  return number;
+}
+
 }   // namespace BT