Document environment variable creation helpers

src/environment.c

@@ -364,6 +364,14 @@ static akerr_ErrorContext *environment_create_named(akbasic_Environment *obj, co
     SUCCEED_RETURN(errctx);
 }
 
+/**
+ * @brief Find a variable in this scope, creating and initializing it if absent.
+ *
+ * @param obj The scope to search and, on a miss, to create in.
+ * @param varname Name including its type suffix.
+ * @param dest Output destination populated with the variable.
+ * @return `NULL` on success, otherwise an error context owned by the caller.
+ */
 akerr_ErrorContext *akbasic_environment_create(akbasic_Environment *obj, const char *varname, akbasic_Variable **dest)
 {
     PREPARE_ERROR(errctx);
@@ -372,6 +380,16 @@ akerr_ErrorContext *akbasic_environment_create(akbasic_Environment *obj, const c
     SUCCEED_RETURN(errctx);
 }
 
+/**
+ * @brief Find a variable in this scope, creating it without value storage if absent.
+ *
+ * The caller must initialize the variable before evaluating it.
+ *
+ * @param obj The scope to search and, on a miss, to create in.
+ * @param varname Name including its type suffix.
+ * @param dest Output destination populated with the variable.
+ * @return `NULL` on success, otherwise an error context owned by the caller.
+ */
 akerr_ErrorContext *akbasic_environment_create_empty(akbasic_Environment *obj, const char *varname,
 							akbasic_Variable **dest)
 {