1 files changed, 64 insertions, 0 deletions
diff --git a/docs/source/lang/cpp/sizeof.rst b/docs/source/lang/cpp/sizeof.rst
new file mode 100644
index 0000000..ec2dea6
--- /dev/null
+++ b/docs/source/lang/cpp/sizeof.rst
@@ -0,0 +1,64 @@
+.. highlight:: cpp
+
+.. _lang-sizeof:
+
+``sizeof()``
+============
+
+The ``sizeof`` operator on the Maple returns the number of bytes
+needed to store a value of a given type\ [#fcharsize]_.  This can be
+an ordinary numeric type, like ``int``.  It can be something more
+complicated, like a ``struct`` or ``union``.  If the argument to
+``sizeof`` is an array, it returns the total number of bytes occupied
+by the array.
+
+The general syntax looks like this::
+
+    sizeof(type)
+    sizeof(var)
+
+Example
+-------
+
+The ``sizeof`` operator is useful for dealing with arrays (such as
+strings) where it is convenient to be able to change the size of the
+array without breaking other parts of the program.
+
+This program prints out a text string one character at a time. Try
+changing the text phrase::
+
+    char myStr[] = "this is a test";
+    int i;
+
+    void setup() {
+      Serial.begin(9600);
+    }
+
+    void loop() {
+      for (i = 0; i < sizeof(myStr) - 1; i++) {
+        Serial.print(i, DEC);
+        Serial.print(" = ");
+        Serial.println(myStr[i], BYTE);
+      }
+    }
+
+
+Note that ``sizeof`` returns the total number of bytes. So for larger
+variable types such as ``int``, the :ref:`for loop <lang-for>`
+would look something like this::
+
+    for (i = 0; i < (sizeof(myInts)/sizeof(int)) - 1; i++) {
+      // do something with myInts[i]
+    }
+
+.. rubric:: Footnotes
+
+.. [#fcharsize] Technically (and pedantically) speaking, ``sizeof``
+   returns a multiple of the number of bits a ``char`` occupies in
+   memory.  However, on the Maple (this goes for most C++
+   implementations), a ``char`` occupies 8 bits = 1 byte.  All the C++
+   standard guarantees, however, is that a ``char`` occupies at
+   *least* 8 bits.
+
+.. include:: /arduino-cc-attribution.txt
+