fix(headers): moved all headers to fourdst/

src/composition/meson.build

@@ -1,12 +1,26 @@
-# Define the library
-composition_sources = files(
-  'private/composition.cpp',
+required_headers = [
+    'fourdst/composition/atomicSpecies.h',
+    'fourdst/composition/species.h',
+    'fourdst/composition/composition.h'
+]
+
+foreach h : required_headers
+    if not cpp.has_header(h, include_directories: include_directories('include'))
+        error('libcomposition requires the header file ' + h + ' to be present in the fourdst/composition directory.')
+    endif
+endforeach
+
+species_weight_dep = declare_dependency(
+    include_directories: include_directories('include'),
 )
 
-composition_headers = files(
-    'public/composition.h'
+message('✅ libcomposition species_weight dependency declared')
+
+composition_sources = files(
+  'lib/composition.cpp',
 )
 
+
 dependencies = [
     species_weight_dep,
     const_dep,
@@ -17,17 +31,20 @@ dependencies = [
 # Define the libcomposition library so it can be linked against by other parts of the build system
 libcomposition = library('composition',
     composition_sources, 
-    include_directories: include_directories('public'),
     cpp_args: ['-fvisibility=default'],
     dependencies: dependencies,
     install : true)
 
 composition_dep = declare_dependency(
-    include_directories: include_directories('public'),
     link_with: libcomposition,
     dependencies: dependencies,
     sources: composition_sources,
 )
 
 # Make headers accessible
+composition_headers = files(
+  'include/fourdst/composition/composition.h',
+  'include/fourdst/composition/atomicSpecies.h',
+  'include/fourdst/composition/species.h'
+)
 install_headers(composition_headers, subdir : 'fourdst/fourdst/composition')