Index: src/Makefile
==================================================================
--- src/Makefile
+++ src/Makefile
@@ -2,10 +2,11 @@
 LIB_MAJOR = 0
 LIB_MINOR = 0
 
 SRCS = array.c		\
        class.c		\
+       int.c		\
        map.c		\
        object.c		\
        range.c		\
        refpool.c	\
        string.c

ADDED   src/int.c
Index: src/int.c
==================================================================
--- src/int.c
+++ src/int.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2012, Jonathan Schleifer <js@webkeks.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "object.h"
+#include "int.h"
+
+struct CFWInt {
+	CFWObject obj;
+	intmax_t value;
+};
+
+static bool
+ctor(void *ptr, va_list args)
+{
+	CFWInt *integer = ptr;
+
+	integer->value = va_arg(args, intmax_t);
+
+	return true;
+}
+
+intmax_t
+cfw_int_value(CFWInt *integer)
+{
+	return integer->value;
+}
+
+static CFWClass class = {
+	.name = "CFWInt",
+	.size = sizeof(CFWInt),
+	.ctor = ctor
+};
+CFWClass *cfw_int = &class;

ADDED   src/int.h
Index: src/int.h
==================================================================
--- src/int.h
+++ src/int.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2012, Jonathan Schleifer <js@webkeks.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __COREFW_INT_H__
+#define __COREFW_INT_H__
+
+#include "class.h"
+
+typedef struct CFWInt CFWInt;
+extern CFWClass *cfw_int;
+extern intmax_t cfw_int_value(CFWInt*);
+
+#endif

Index: tests/tests.c
==================================================================
--- tests/tests.c
+++ tests/tests.c
@@ -27,10 +27,11 @@
 #include <stdio.h>
 
 #include "object.h"
 #include "refpool.h"
 #include "string.h"
+#include "int.h"
 #include "array.h"
 #include "map.h"
 
 static void
 print_map(CFWMap *map)
@@ -40,13 +41,19 @@
 	cfw_map_iter(map, &iter);
 
 	fputs("{\n", stdout);
 
 	while (iter.key != NULL) {
-		printf("\t%s = %s\n",
-		    cfw_string_c(iter.key),
-		    cfw_string_c(iter.obj));
+		if (cfw_is(iter.obj, cfw_string)) {
+			printf("\t%s = %s\n",
+			    cfw_string_c(iter.key),
+			    cfw_string_c(iter.obj));
+		} else if (cfw_is(iter.obj, cfw_int)) {
+			printf("\t%s = %jd\n",
+			    cfw_string_c(iter.key),
+			    cfw_int_value(iter.obj));
+		}
 
 		cfw_map_iter_next(&iter);
 	}
 
 	fputs("}\n", stdout);
@@ -88,11 +95,13 @@
 
 	m = cfw_new_p(cfw_map,
 	    cfw_new_p(cfw_string, "Hallo"),
 	    cfw_new_p(cfw_string, "Welt!"),
 	    cfw_new_p(cfw_string, "Test"),
-	    cfw_new_p(cfw_string, "success!"), NULL);
+	    cfw_new_p(cfw_string, "success!"),
+	    cfw_new_p(cfw_string, "int"),
+	    cfw_new_p(cfw_int, INTMAX_C(1234)), NULL);
 
 	print_map(m);
 
 	cfw_map_set(m,
 	    cfw_new_p(cfw_string, "Hallo"),