1 files changed, 69 insertions, 0 deletions
diff --git a/thirdparty/tourist/foundation/src/ref.cpp b/thirdparty/tourist/foundation/src/ref.cpp
new file mode 100644
index 000000000..feda5b0dd
--- /dev/null
+++ b/thirdparty/tourist/foundation/src/ref.cpp
@@ -0,0 +1,69 @@
+#include <foundation/buffer.h>
+
+#include "slab.h"
+
+//------------------------------------------------------------------------------
+Pointer::Pointer(Slab* slab, const uint8* ptr)
+: _ptr(uintptr(ptr))
+, _pinned(0)
+{
+    uintptr bias = (uintptr(ptr) - uintptr(slab)) / alignof(Slab);
+    _slab_offset = bias;
+}
+
+//------------------------------------------------------------------------------
+Pointer::Pointer(Pointer&& rhs)
+{
+    *this = std::move(rhs);
+}
+
+//------------------------------------------------------------------------------
+Pointer::~Pointer()
+{
+    if (_pinned)
+        get_slab()->dec_ref();
+}
+
+//------------------------------------------------------------------------------
+void Pointer::operator = (Pointer&& rhs)
+{
+    std::swap(_value, rhs._value);
+}
+
+//------------------------------------------------------------------------------
+bool Pointer::is_valid() const
+{
+    return _ptr != 0;
+}
+
+//------------------------------------------------------------------------------
+void Pointer::pin()
+{
+    if (!_pinned)
+        get_slab()->inc_ref();
+    _pinned = 1;
+}
+
+//------------------------------------------------------------------------------
+const uint8* Pointer::get() const
+{
+    return (uint8*)_ptr;
+}
+
+//------------------------------------------------------------------------------
+Slab* Pointer::get_slab() const
+{
+    uintptr bias = _slab_offset * alignof(Slab);
+    bias += uintptr(_ptr) & (alignof(Slab) - 1);
+    return (Slab*)(_ptr - bias);
+}
+
+
+
+//------------------------------------------------------------------------------
+BufferRef::BufferRef(Slab* slab, const uint8* ptr)
+: Pointer(slab, ptr)
+{
+    pin();
+}
+