Add con_exists function

Checks the all_cons queue and returns true if a given con is found.

diff --git a/include/con.h b/include/con.h
index 6cd1ef3e41eca1ad90c3af125ecae7fa10161675..674ee61d3b1fd177a537cbaff2a5f0ea878f5c31 100644 (file)
--- a/include/con.h
+++ b/include/con.h
@@ -165,6 +165,13 @@ Con *con_by_window_id(xcb_window_t window);
  */
 Con *con_by_con_id(long target);
 
+/**
+ * Returns true if the given container (still) exists.
+ * This can be used, e.g., to make sure a container hasn't been closed in the meantime.
+ *
+ */
+bool con_exists(Con *con);
+
 /**
  * Returns the container with the given frame ID or NULL if no such container
  * exists.

diff --git a/src/con.c b/src/con.c
index 2e22619f3d838968de6840a29d130ed61bbbcfc4..fcde4c100c750bbcece6e7c3a9ddec398eb3c704 100644 (file)
--- a/src/con.c
+++ b/src/con.c
@@ -604,6 +604,15 @@ Con *con_by_con_id(long target) {
     return NULL;
 }
 
+/*
+ * Returns true if the given container (still) exists.
+ * This can be used, e.g., to make sure a container hasn't been closed in the meantime.
+ *
+ */
+bool con_exists(Con *con) {
+    return con_by_con_id((long)con) != NULL;
+}
+
 /*
  * Returns the container with the given frame ID or NULL if no such container
  * exists.