pine_sequence_cache_observer.hpp

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#pragma once
 
#include <pineforge/detail/scratch_backing.hpp>
 
namespace pineforge::source::detail {
 
// Internal diagnostics at lazy backing construction. The observer only
// borrows the owner, never a cache line; it must not retain it past table
// clear/rebuild/destruction or mutate it. Logical I/O charging is separate.
struct SequenceCacheObserver {
    void* context = nullptr;
    void (*created)(void*, const ::pineforge::detail::ScratchBacking&) noexcept = nullptr;
};
inline thread_local SequenceCacheObserver sequence_cache_observer{};
inline SequenceCacheObserver set_sequence_cache_observer(SequenceCacheObserver observer) noexcept {
    const auto previous = sequence_cache_observer;
    sequence_cache_observer = observer;
    return previous;
}
 
} // namespace pineforge::source::detail