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Sun, 12 May 2024 11:51:53 -0700 (PDT) MIME-Version: 1.0 From: Andy Tai Date: Sun, 12 May 2024 11:51:17 -0700 Message-ID: Subject: dereferencing C pointer at scheme level To: help-guix@gnu.org Content-Type: text/plain; charset="UTF-8" Received-SPF: pass client-ip=2607:f8b0:4864:20::b29; envelope-from=lichengtai@gmail.com; helo=mail-yb1-xb29.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.001, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-guix@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-guix-bounces+larch=yhetil.org@gnu.org Sender: help-guix-bounces+larch=yhetil.org@gnu.org X-Migadu-Country: US X-Migadu-Flow: FLOW_IN X-Migadu-Queue-Id: 712AB635E2 X-Migadu-Scanner: mx12.migadu.com X-Migadu-Spam-Score: -8.97 X-Spam-Score: -8.97 X-TUID: BRtvyzK/2Loo Hi, a question on access to C pointer in scheme: if a C function returning a pointer is wrapped and accessed from scheme code, int64_t * func() { int64_t *p = make_new_pointer(); *p = // something return p; } in scheme (GNU guile) (set! p (func)) it is possible to see that p is now a pointer. How to dereference the pointer to get the value it points to, in guile, on the scheme side? Thanks