Put trampolines in original class namespace

- This simplifies wrapping somewhat and avoids compile errors when the
  trampoline references a class in a parent namespace
- This is a breaking change -- bindings need to be recompiled to match
  each other

Author: virtuald

robotpy_build/autowrap/context.py

@@ -296,6 +296,9 @@ class BaseClassData:
     #: turned into underscores.
     full_cpp_name_identifier: str  # was x_qualname_
 
+    #: This ends with ::
+    namespace_: str
+
     #: C++ name + components, no template parameters
     dep_cpp_name: str
 

robotpy_build/autowrap/cxxparser.py

@@ -191,7 +191,9 @@ def _count_and_unwrap(
             assert False
 
 
-def _fmt_base_name(typename: PQName) -> typing.Tuple[str, str, str, typing.List[str]]:
+def _fmt_base_name(
+    typename: PQName,
+) -> typing.Tuple[str, str, str, str, typing.List[str]]:
     all_parts = []
     nameonly_parts = []
 
@@ -209,10 +211,12 @@ def _fmt_base_name(typename: PQName) -> typing.Tuple[str, str, str, typing.List[
 
     if last_segment.specialization:
         most_parts = all_parts[:-1]
+        ns_parts = all_parts[:-1]
         all_parts.append(last_segment.format())
         most_parts.append(last_segment.name)
         tparam_list = [arg.format() for arg in last_segment.specialization.args]
     else:
+        ns_parts = all_parts[:]
         all_parts.append(last_segment.name)
         most_parts = all_parts
         tparam_list = []
@@ -221,6 +225,7 @@ def _fmt_base_name(typename: PQName) -> typing.Tuple[str, str, str, typing.List[
         "::".join(most_parts),
         "::".join(all_parts),
         "::".join(nameonly_parts),
+        "::".join(ns_parts),
         tparam_list,
     )
 
@@ -824,8 +829,8 @@ def _process_class_bases(
             if base.access == "private":
                 continue
 
-            cpp_name, cpp_name_w_templates, dep_cpp_name, tparam_list = _fmt_base_name(
-                base.typename
+            cpp_name, cpp_name_w_templates, dep_cpp_name, base_ns, tparam_list = (
+                _fmt_base_name(base.typename)
             )
             if ignored_bases.pop(cpp_name_w_templates, None):
                 continue
@@ -846,6 +851,11 @@ def _process_class_bases(
                     cpp_name = user_bqual[:tp]
                     template_params = user_bqual[tp + 1 : -1]
                 dep_cpp_name = cpp_name
+                ns_idx = cpp_name.rfind("::")
+                if ns_idx == -1:
+                    base_ns = ""
+                else:
+                    base_ns = cpp_name[:ns_idx]
             else:
                 # TODO: we don't handle nested child classes with templates here
                 #       ... but that has to be rather obscure?
@@ -858,17 +868,22 @@ def _process_class_bases(
                 # If no explicit namespace specified, we assume base classes
                 # live in the same namespace as the class
                 if len(base.typename.segments) == 1:
+                    base_ns = cls_namespace
                     cpp_name = f"{cls_namespace}::{cpp_name}"
                     cpp_name_w_templates = f"{cls_namespace}::{cpp_name_w_templates}"
                     dep_cpp_name = f"{cls_namespace}::{dep_cpp_name}"
 
             base_identifier = cpp_name.translate(_qualname_trans)
 
+            if base_ns:
+                base_ns = f"{base_ns}::"
+
             bases.append(
                 BaseClassData(
                     full_cpp_name=cpp_name,
                     full_cpp_name_w_templates=cpp_name_w_templates,
                     full_cpp_name_identifier=base_identifier,
+                    namespace_=base_ns,
                     dep_cpp_name=dep_cpp_name,
                     template_params=template_params,
                 )
@@ -1242,8 +1257,8 @@ def on_class_end(self, state: AWClassBlockState) -> None:
             if cdata.template_argument_list:
                 tmpl = f", {cdata.template_argument_list}"
 
-            trampoline_cfg = f"rpygen::PyTrampolineCfg_{cdata.cls_cpp_identifier}<{cdata.template_argument_list}>"
-            tname = f"rpygen::PyTrampoline_{cdata.cls_cpp_identifier}<typename {ctx.full_cpp_name}{tmpl}, typename {trampoline_cfg}>"
+            trampoline_cfg = f"{cdata.ctx.namespace}::PyTrampolineCfg_{cdata.cls_cpp_identifier}<{cdata.template_argument_list}>"
+            tname = f"{cdata.ctx.namespace}::PyTrampoline_{cdata.cls_cpp_identifier}<typename {ctx.full_cpp_name}{tmpl}, typename {trampoline_cfg}>"
             tvar = f"{ctx.cpp_name}_Trampoline"
 
             ctx.trampoline = TrampolineData(

robotpy_build/autowrap/render_cls_rpy_include.py

@@ -101,10 +101,8 @@ def _render_cls_trampoline(
         for base in cls.bases:
             r.writeln(f"#include <rpygen/{ base.full_cpp_name_identifier }.hpp>")
 
-    r.writeln("\nnamespace rpygen {")
-
     if cls.namespace:
-        r.writeln(f"\nusing namespace {cls.namespace};")
+        r.writeln(f"\nnamespace {cls.namespace} {{")
 
     if hctx.using_declarations:
         r.writeln()
@@ -122,7 +120,7 @@ def _render_cls_trampoline(
     #
 
     r.writeln(
-        f"\ntemplate <{postcomma(template_parameter_list)}typename CfgBase = EmptyTrampolineCfg>"
+        f"\ntemplate <{postcomma(template_parameter_list)}typename CfgBase = rpygen::EmptyTrampolineCfg>"
     )
 
     if cls.bases:
@@ -131,7 +129,7 @@ def _render_cls_trampoline(
         with r.indent():
             for base in cls.bases:
                 r.writeln(
-                    f"PyTrampolineCfg_{base.full_cpp_name_identifier}<{postcomma(base.template_params)}"
+                    f"{base.namespace_}PyTrampolineCfg_{base.full_cpp_name_identifier}<{postcomma(base.template_params)}"
                 )
 
             r.writeln("CfgBase")
@@ -168,7 +166,7 @@ def _render_cls_trampoline(
 
         for base in cls.bases:
             r.rel_indent(2)
-            r.writeln(f"PyTrampoline_{base.full_cpp_name_identifier}<")
+            r.writeln(f"{base.namespace_}PyTrampoline_{base.full_cpp_name_identifier}<")
 
         with r.indent():
             r.writeln("PyTrampolineBase")
@@ -284,7 +282,10 @@ def _render_cls_trampoline(
             r.writeln()
             r.write_trim(trampoline.inline_code)
 
-    r.writeln("};\n\n}; // namespace rpygen")
+    r.writeln("};\n\n")
+
+    if cls.namespace:
+        r.writeln(f"}}; // namespace {cls.namespace}")
 
 
 def _render_cls_trampoline_virtual_method(

tests/cpp/pyproject.toml.tmpl

@@ -61,6 +61,7 @@ generate = [
     { lifetime = "lifetime.h" },
     { nested = "nested.h" },
     { ns_class = "ns_class.h" },
+    { ns_hidden = "ns_hidden.h" },
     { operators = "operators.h" },
     { overloads = "overloads.h" },
     { parameters = "parameters.h" },

tests/cpp/rpytest/ft/include/ns_hidden.h

@@ -0,0 +1,23 @@
+#pragma once
+
+namespace n {
+    enum class E {
+        Item,
+    };
+};
+
+namespace o {
+    struct O {
+        O() = default;
+        virtual ~O() = default;
+    };
+};
+
+namespace n::h {
+    class C : public o::O {
+    public:
+        // E is resolved here because it's in the parent namespace but our
+        // trampoline was originally in a different namespace and failed
+        virtual E fn() { return E::Item; }
+    };
+};