Provide library version in API (#586)

This fixes #582.

include/cosim/lib_info.hpp

@@ -22,5 +22,18 @@ namespace cosim
 constexpr const char* library_short_name = "libcosim";
 
 
+/// Software version
+struct version
+{
+    int major = 0;
+    int minor = 0;
+    int patch = 0;
+};
+
+
+/// Returns the version of the libcosim library.
+version library_version();
+
+
 } // namespace cosim
 #endif // header guard

src/CMakeLists.txt

@@ -97,6 +97,9 @@ set(sources
     "cosim/utility/uuid.cpp"
     "cosim/utility/zip.cpp"
 )
+set(generatedSources
+    "cosim/lib_info.cpp"
+)
 
 if(LIBCOSIM_WITH_FMUPROXY)
     list(APPEND publicHeaders
@@ -126,7 +129,19 @@ set(publicHeadersFull)
 foreach(h IN LISTS publicHeaders)
     list(APPEND publicHeadersFull "${publicHeaderDir}/${h}")
 endforeach()
-set(allSources ${publicHeadersFull} ${privateHeaders} ${generatedHeaders} ${sources})
+
+set(generatedSourcesFull)
+foreach(src IN LISTS generatedSources)
+    set(tgt "${CMAKE_CURRENT_BINARY_DIR}/${src}")
+    configure_file(
+        "${CMAKE_CURRENT_SOURCE_DIR}/${src}.in"
+        "${tgt}"
+        @ONLY
+    )
+    list(APPEND generatedSourcesFull "${tgt}")
+endforeach()
+
+set(allSources ${publicHeadersFull} ${privateHeaders} ${generatedHeaders} ${sources} ${generatedSourcesFull})
 
 add_custom_command(
     OUTPUT osp_system_structure_schema.hpp

src/cosim/lib_info.cpp.in

@@ -0,0 +1,16 @@
+#include "cosim/lib_info.hpp"
+
+
+namespace cosim
+{
+
+
+version library_version()
+{
+    // clang-format off
+    return { @PROJECT_VERSION_MAJOR@, @PROJECT_VERSION_MINOR@, @PROJECT_VERSION_PATCH@ };
+    // clang-format on
+}
+
+
+} // namespace cosim