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copied!<p>Arrays may be indexed by any integer type.</p> <p>The <a href="http://golang.org/ref/spec#Array_types" rel="nofollow">Array types</a> section of the <a href="http://golang.org/ref/spec" rel="nofollow">Go Programming Language Specification</a> says that in an array type definition,</p> <blockquote> <p>The length is part of the array's type and must be a constant expression that evaluates to a non-negative integer value.</p> </blockquote> <p>In an <a href="http://golang.org/ref/spec#Indexes" rel="nofollow">index expression</a> such as <code>a[x]</code>:</p> <blockquote> <p><code>x</code> must be an integer value and <code>0 <= x < len(a)</code></p> </blockquote> <p>But there is a limitation on the <em>magnitude</em> of an index; the description of <a href="http://golang.org/ref/spec#Length_and_capacity" rel="nofollow">Length and capacity</a> says:</p> <blockquote> <p>The built-in functions <code>len</code> and <code>cap</code> take arguments of various types and return a result of type <code>int</code>. The implementation guarantees that the result always fits into an <code>int</code>.</p> </blockquote> <p>So the declared size of an array, or the index in an index expression, can be of any <a href="http://golang.org/ref/spec#Numeric_types" rel="nofollow">integer type</a> (<code>int</code>, <code>uint</code>, <code>uintptr</code>, <code>int8</code>, <code>int16</code>, <code>int32</code>, <code>int64</code>, <code>uint8</code>, <code>uint16</code>, <code>uint32</code>, <code>uint64</code>), but it must be non-negative and within the range of type <code>int</code> (which is the same size as either <code>int32</code> or <code>int64</code> -- though it's a distinct type from either).</p>

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