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/*
 * buf_generic.h — Macro-template for shared-memory typed buffers.
 *
 * Before including, define:
 *   BUF_PREFIX         — function prefix (e.g., buf_i64)
 *   BUF_ELEM_TYPE      — C element type (e.g., int64_t)
 *   BUF_VARIANT_ID     — unique integer for header validation
 *   BUF_ELEM_SIZE      — sizeof(BUF_ELEM_TYPE) or fixed string length
 *
 * Optional:
 *   BUF_HAS_COUNTERS   — generate incr/decr/cas (integer types only)
 *   BUF_IS_FLOAT       — element is float/double (affects SV conversion)