1 files changed, 41 insertions, 0 deletions
diff --git a/compat/borrowed-ptr.cpp b/compat/borrowed-ptr.cpp
new file mode 100644
index 00000000..8c05b751
--- /dev/null
+++ b/compat/borrowed-ptr.cpp
@@ -0,0 +1,41 @@
+#include "borrowed-ptr.inl"
+#include "compat/assert.hpp"
+
+namespace floormat::detail_borrowed_ptr {
+
+control_block_::control_block_(void* ptr) noexcept: _ptr{ptr}, _count{1}
+{
+    fm_debug_assert(ptr);
+}
+
+void control_block_::incr() noexcept
+{
+    auto val = ++_count;
+    (void)val;
+    fm_debug_assert(val > 1);
+}
+
+void control_block_::decr() noexcept
+{
+    auto val = --_count;
+    fm_debug_assert(val != (uint32_t)-1);
+    if (val == 0)
+    {
+        free();
+        _ptr = nullptr;
+    }
+}
+
+control_block_::~control_block_() noexcept { decr(); }
+uint32_t control_block_::count() const noexcept { return _count; }
+
+} // namespace floormat::detail_borrowed_ptr
+
+namespace floormat {
+
+namespace { struct Foo {}; }
+
+template struct detail_borrowed_ptr::control_block<Foo>;
+template class bptr<Foo>;
+
+} // namespace floormat