Added stc/extend.h: A generalized way to type-safely extend a container with new members which can be accessed from the template parameters. See examples/functor.c

1 files changed, 65 insertions, 0 deletions

diff --git a/include/stc/extend.h b/include/stc/extend.h
new file mode 100644
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+++ b/include/stc/extend.h
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+/* MIT License
+ *
+ * Copyright (c) 2023 Tyge Løvset
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <stc/ccommon.h>
+#include <stc/forward.h>
+
+#ifdef i_key_str
+  #define _i_key cstr
+#elif defined i_keyclass
+  #define _i_key i_keyclass
+#elif defined i_keyboxed
+  #define _i_key i_keyboxed
+#elif defined i_key
+  #define _i_key i_key
+#endif
+
+#ifdef i_val_str
+  #define _i_val cstr
+#elif defined i_valclass
+  #define _i_val i_valclass
+#elif defined i_valboxed
+  #define _i_val i_valboxed
+#elif defined i_val
+  #define _i_val i_val
+#endif
+
+#ifdef _i_key
+  c_PASTE(forward_, i_con)(i_type, _i_key, _i_val);
+#else
+  c_PASTE(forward_, i_con)(i_type, _i_val);
+#endif
+
+typedef struct {
+    i_ext;
+    i_type get;
+} c_PASTE(i_type, Ext);
+
+#define c_getcon(cptr) c_container_of(cptr, _cx_memb(Ext), get)
+
+#define i_is_forward
+#define _i_inc <stc/i_con.h>
+#include _i_inc
+#undef _i_inc
+#undef _i_key
+#undef _i_val
+#undef i_con
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