Cleanup: Alembic, move the C++ code to `blender::io::alembic` namespace

This commit only moves code into the `blender::io::alembic` namespace,
it does not move `static` functions into an anonymous namespace.

No functional changes.

1 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/io/alembic/exporter/abc_writer_hair.h b/source/blender/io/alembic/exporter/abc_writer_hair.h
index 67d1b7b3d23..b6860926d44 100644
--- a/source/blender/io/alembic/exporter/abc_writer_hair.h
+++ b/source/blender/io/alembic/exporter/abc_writer_hair.h
@@ -23,9 +23,14 @@
 
 #include "abc_writer_object.h"
 
+struct Mesh;
 struct ParticleSettings;
 struct ParticleSystem;
 
+namespace blender {
+namespace io {
+namespace alembic {
+
 class AbcHairWriter : public AbcObjectWriter {
   ParticleSystem *m_psys;
 
@@ -59,4 +64,8 @@ class AbcHairWriter : public AbcObjectWriter {
                                std::vector<int32_t> &hvertices);
 };
 
+}  // namespace alembic
+}  // namespace io
+}  // namespace blender
+
 #endif /* __ABC_WRITER_HAIR_H__ */