implement Link in link.cpp

Makefile

@@ -1,2 +1,2 @@
-ipyml : main.cpp
+ipyml : main.cpp link.cpp
 	g++ -std=c++11 $^ -lmnl -o $@

link.cpp

@@ -0,0 +1,35 @@
+#include "link.h"
+
+#include <libmnl/libmnl.h>
+#include <linux/if_link.h>
+#include <string>
+
+// https://netfilter.org/projects/libmnl/doxygen/html/group__attr.html
+
+int Link::mnl_attr_cb(const nlattr *attr, void *data) {
+  Link *link = (Link *)data;
+  switch (mnl_attr_get_type(attr)) {
+  case IFLA_ADDRESS:
+    link->hwaddr = attr;
+    break;
+  case IFLA_BROADCAST:
+    link->broadcast = attr;
+    break;
+  case IFLA_IFNAME:
+    link->ifname = mnl_attr_get_str(attr);
+    break;
+  }
+  return MNL_CB_OK;
+}
+
+void Link::write_yaml(std::ostream &stream,
+                      const yaml_indent_level_t indent_level) const {
+  const std::string indent(indent_level, ' ');
+  stream << "ifname: " + ifname + "\n";
+  stream << indent + "hwaddr: ";
+  hwaddr.write_yaml(stream);
+  stream << "\n";
+  stream << indent + "broadcast: ";
+  broadcast.write_yaml(stream);
+  stream << "\n";
+}

link.h

@@ -4,46 +4,20 @@
 #include "hardware_address.h"
 #include "yaml.h"
 
-#include <libmnl/libmnl.h>
-#include <linux/if_link.h>
+#include <linux/netlink.h>
 #include <ostream>
 #include <string>
 
-// https://netfilter.org/projects/libmnl/doxygen/html/group__attr.html
-
 class Link : public YamlObject {
-public:
   std::string ifname;
   HardwareAddress hwaddr, broadcast;
 
+public:
   // typedef int (*mnl_attr_cb_t)(const struct nlattr *attr, void *data);
-  static int mnl_attr_cb(const nlattr *attr, void *data) {
-    Link *link = (Link *)data;
-    switch (mnl_attr_get_type(attr)) {
-    case IFLA_ADDRESS:
-      link->hwaddr = attr;
-      break;
-    case IFLA_BROADCAST:
-      link->broadcast = attr;
-      break;
-    case IFLA_IFNAME:
-      link->ifname = mnl_attr_get_str(attr);
-      break;
-    }
-    return MNL_CB_OK;
-  }
+  static int mnl_attr_cb(const nlattr *attr, void *data);
 
   void write_yaml(std::ostream &stream,
-                  const yaml_indent_level_t indent_level = 0) const {
-    const std::string indent(indent_level, ' ');
-    stream << "ifname: " + ifname + "\n";
-    stream << indent + "hwaddr: ";
-    hwaddr.write_yaml(stream);
-    stream << "\n";
-    stream << indent + "broadcast: ";
-    broadcast.write_yaml(stream);
-    stream << "\n";
-  }
+                  const yaml_indent_level_t indent_level = 0) const;
 };
 
 #endif