Base: Remove Boost-based signals and switch to FastSignals.

src/Base/CMakeLists.txt

@@ -84,7 +84,7 @@ endif()
 
 list(APPEND FreeCADBase_LIBS ${QtCore_LIBRARIES})
 
-list(APPEND FreeCADBase_LIBS fmt::fmt)
+list(APPEND FreeCADBase_LIBS libfastsignals fmt::fmt)
 
 if (BUILD_DYNAMIC_LINK_PYTHON)
     list(APPEND FreeCADBase_LIBS ${Python3_LIBRARIES})

src/Base/Parameter.h

@@ -51,7 +51,7 @@ using PyObject = struct _object;
 
 #include <map>
 #include <vector>
-#include <boost/signals2.hpp>
+#include <fastsignals/signal.h>
 #include <xercesc/util/XercesDefs.hpp>
 
 #include "Handle.h"
@@ -565,7 +565,7 @@ public:
      *  - Group removal: both 'name' and 'value' are empty
      *  - Group rename: 'name' is the new name, and 'value' is the old name
      */
-    boost::signals2::signal<
+    fastsignals::signal<
         void(ParameterGrp* /*param*/, ParamType /*type*/, const char* /*name*/, const char* /*value*/)>
         signalParamChanged;
 

src/Base/ParameterPy.cpp

@@ -92,7 +92,7 @@ public:
 public:
     // NOLINTBEGIN
     Py::Object callable;
-    boost::signals2::scoped_connection conn;
+    fastsignals::scoped_connection conn;
     ParameterGrp* _target = nullptr;  // no reference counted, do not access
     // NOLINTEND
 

src/Base/Tools.h

@@ -29,22 +29,13 @@
 #ifndef FC_GLOBAL_H
 # include <FCGlobal.h>
 #endif
+#include <algorithm>
 #include <cmath>
 #include <numbers>
 #include <ostream>
 #include <string>
 #include <vector>
-
-#include <boost/signals2/shared_connection_block.hpp>
-
-namespace boost
-{
-namespace signals2
-{
-class connection;
-}
-}  // namespace boost
-
+#include <fastsignals/signal.h>
 
 class QString;
 
@@ -332,12 +323,10 @@ private:
 
 class ConnectionBlocker
 {
-    using Connection = boost::signals2::connection;
-    using ConnectionBlock = boost::signals2::shared_connection_block;
-    ConnectionBlock blocker;
+    fastsignals::shared_connection_block blocker;
 
 public:
-    ConnectionBlocker(Connection& c)
+    ConnectionBlocker(fastsignals::advanced_connection& c)
         : blocker(c)
     {}
     ~ConnectionBlocker() = default;