cxx: Add event_cb_add functions to events

This enables a syntax like:

  button.clicked_event_cb_add([]() { std::cout << "Hello" << std::endl; });

I could not manage to pass the std::placeholders inside the template,
depending on whether the lambda has arguments or not. Not sure if
that's even possible.

diff --git a/src/lib/eolian_cxx/grammar/class_definition.hpp b/src/lib/eolian_cxx/grammar/class_definition.hpp
index 13349d4..295662f 100644 (file)
--- a/src/lib/eolian_cxx/grammar/class_definition.hpp
+++ b/src/lib/eolian_cxx/grammar/class_definition.hpp
@@ -156,6 +156,24 @@ struct class_definition_generator
                 << scope_tab << "} const " << string_replace(',', '_') << "_event;\n"
              ))).generate(sink, std::vector<attributes::event_def>{e}, context))
             return false;
+          if (!as_generator(
+                 scope_tab << "template <typename F>\n"
+                 << scope_tab << "typename std::enable_if<std::is_bind_expression<F>::value, ::efl::eolian::signal_connection>::type\n"
+                 << scope_tab << string_replace(',', '_') << "_event_cb_add(F function)\n"
+                 << scope_tab << "{\n"
+                 << scope_tab << scope_tab << "return ::efl::eolian::event_add(" << string_replace(',', '_') << "_event, *this, function);\n"
+                 << scope_tab << "}\n")
+              .generate(sink, std::make_tuple(e.name, e.name), context))
+            return false;
+          if (!as_generator(
+                 scope_tab << "template <typename F>\n"
+                 << scope_tab << "typename std::enable_if<!std::is_bind_expression<F>::value, ::efl::eolian::signal_connection>::type\n"
+                 << scope_tab << string_replace(',', '_') << "_event_cb_add(F function)\n"
+                 << scope_tab << "{\n"
+                 << scope_tab << scope_tab << "return ::efl::eolian::event_add(" << string_replace(',', '_') << "_event, *this, std::bind(function));\n"
+                 << scope_tab << "}\n")
+              .generate(sink, std::make_tuple(e.name, e.name), context))
+            return false;
           if (e.beta && !as_generator("#endif\n").generate(sink, attributes::unused, context))
             return false;
           if (e.protect && !as_generator("#endif\n").generate(sink, attributes::unused, context))