Simple example of Writing a Library https://developer.mbed.org/cookbook/Writing-a-Library

Revision:
0:a9e677a711b0
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Flasher.cpp	Thu Jan 07 09:07:26 2016 +0000
@@ -0,0 +1,13 @@
+#include "Flasher.h"
+#include "mbed.h"
+ 
+Flasher::Flasher(PinName pin) : _pin(pin) {
+    _pin = 0;
+}
+ 
+void Flasher::flash(int n) {
+    for(int i=0; i<n*2; i++) {
+        _pin = !_pin;
+        wait(0.2);
+    }
+}
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