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<title>length</title>
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<h1>length</h1>
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<p>The keyword is used for sub-typing, i.e., to create user defined types by constraining the range of possible values of the basic type. Its usage is twofold :</p>
<ul>
<li>Used with a basic string type (a string of bits, octets, hexadecimal numbers, characters or universal characters), the keyword constraints the length of the string.</li>
<li>Used with <font face="Courier New"><b>set of</b></font> and <font face="Courier New"><b>record of</b></font> types it limits the number of the elements of the structured type in question.</li>
</ul>
<p>The length boundaries are based on different units depending on the string type with which they are used. (Bits for bitstrings, characters for characterstrings etc.) <br>
When a single integer value is given, it constraints the length of the type in question. <br>
When two integer values are given (separated by two dots), both the minimal and the maximal lengths are constrained.<br>
The keyword <font face="Courier New"><b><a href="infinity.html">infinity</a></b></font> may be used to indicate that the upper limit is not given.</p>
<p>Related keywords:</p>
<ul>
<li><a href="bitstring.html"><b><font face="Courier New" color="#003258" size="4">bitstring</font></b></a></li>
<li><a href="charstring.html"><b><font face="Courier New" color="#003258" size="4">charstring</font></b></a></li>
<li><a href="hexstring.html"><b><font face="Courier New" color="#003258" size="4">hexstring</font></b></a></li>
<li><a href="infinity.html"><b><font face="Courier New" color="#003258" size="4">infinity</font></b></a></li>
<li><a href="octetstring.html"><b><font face="Courier New" color="#003258" size="4">octetstring</font></b></a></li>
<li><a href="of.html"><b><font face="Courier New" color="#003258" size="4">of</font></b></a></li>
<li><a href="type.html"><b><font face="Courier New" color="#003258" size="4">type</font></b></a></li>
<li><a href="universal.html"><b><font face="Courier New" color="#003258" size="4">universal</font></b></a></li>
</ul>
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<h3 align="center"><font face="Courier New" color="#003258" size="5"><b>length()</b></font></h3>
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<p><a name="double_quotation">Example 1</a>:
<p><code> type charstring Pulnoc length (8);<br>
var Pulnoc c_pulnoc;<br>
</code>
<p>The number of characters c_pulnoc can hold is exactly eight.</p>
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<p><a name="quotation_inside">Example 2</a>:
<p><font face="Courier New">type bitstring Amari length (2..5);<br>
</font>
<p>The value domain of type Amari is restricted to bitstring values with length not less than two and not more than five bits.</p>
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<p><a name="relation">Example 3</a>:
<p><code> type record length(7) of integer Egeeszek; </font>
<p>Type Egeeszek is capable of holding exactly seven integers ordered lists.</p>
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<p align="left"><a HREF="BNF.html#stringlength">BNF definition</a> of <font face="Courier New">length</font></p>
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