projects / deliverable / titan.core.git / blame
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|---|---|---|
| 970ed795 | 1 | <!-- |
| 3abe9331 | 2 | Copyright (c) 2000-2015 Ericsson Telecom AB |
| 970ed795 EL |
3 | |
| 4 | All rights reserved. This program and the accompanying materials | |
| 5 | are made available under the terms of the Eclipse Public License v1.0 | |
| 6 | which accompanies this distribution, and is available at | |
| 7 | http://www.eclipse.org/legal/epl-v10.html | |
| 8 | --> | |
| 9 | <html> | |
| 10 | <head> | |
| 11 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> | |
| 12 | <meta http-equiv="Content-Language" content="en-us"> | |
| 13 | <title>friend</title> | |
| 14 | </head> | |
| 15 | <body bgcolor="#DAD3C5" vlink="#0094D2" link="#003258"> | |
| 16 | <table align="left" border="0" cellspacing="0" cellpadding="0" valign=top> | |
| 17 | <tr> | |
| 18 | <td width=105 height=40><a href="https://projects.eclipse.org/projects/tools.titan"><img src="../images/titan_transparent.gif" border=0 width=105 height=40 align="left" alt="Titan"></a></td> | |
| 19 | </tr> | |
| 20 | </table> | |
| 21 | <table border="0" align="right" cellpadding="0" cellspacing="0"> | |
| 22 | <tr> | |
| 23 | <td><a href="../titan_main.html" alt="contents"><img border="0" src="../images/ao.jpg" width="53" height="40"></a></td> | |
| 24 | <td><a href="../titan_index.html" alt="index"><img border="0" src="../images/up.jpg" width="53" height="40"></a></td> | |
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| 27 | </tr> | |
| 28 | </table> | |
| 29 | <p><br clear="all"> | |
| 30 | </p> | |
| 31 | <hr> | |
| 32 | <h1>friend</h1> | |
| 33 | <blockquote> | |
| 34 | <p>1. <a href="#1."> Declaring a definition with friend visibility</a></p> | |
| 35 | <p>2. <a href="#2."> Declaring a friend module</a></p> | |
| 36 | </blockquote> | |
| 37 | <hr align="left" width="75%"> | |
| 38 | <h4><a name="1.">1. Declaring a definition with friend visibility</a></h4> | |
| 39 | <hr align="left" width="50%"> | |
| 40 | <p>Friend is a visibility modifier, that can be atteched to definitions on module level. Where it means that the definition is visible in every friend module where it is imported to. | |
| 41 | <div align="center"> | |
| 42 | <center> | |
| 43 | <table border="0" width="90%" bgcolor="#FFB599" cellpadding="4"> | |
| 44 | <tr> | |
| 45 | <td width="100%"> | |
| 46 | <h3 align="center"><font face="Courier New" color="#003258" size="5"><b>friend definition;</b></font></h3> | |
| 47 | </td> | |
| 48 | </tr> | |
| 49 | </table> | |
| 50 | </center> | |
| 51 | </div> | |
| 52 | <p><a href="#Ex1">Example</a></p> | |
| 53 | <hr align="left" width="75%"> | |
| 54 | <h4><a name="1.">2. Declaring a friend module</a></h4> | |
| 55 | <hr align="left" width="50%"> | |
| 56 | <p>A module can declare his friend modules, for which its friend definition will be visible. | |
| 57 | <div align="center"> | |
| 58 | <center> | |
| 59 | <table border="0" width="90%" bgcolor="#FFB599" cellpadding="4"> | |
| 60 | <tr> | |
| 61 | <td width="100%"> | |
| 62 | <h3 align="center"><font face="Courier New" color="#003258" size="5"><b>friend module identifier_list;</b></font></h3> | |
| 63 | </td> | |
| 64 | </tr> | |
| 65 | </table> | |
| 66 | </center> | |
| 67 | </div> | |
| 68 | <p><a href="#Ex1">Example</a></p> | |
| 69 | <hr align="left" width="75%"> | |
| 70 | <p>Related keywords:</p> | |
| 71 | <ul> | |
| 72 | <li><a href="public.html"><b><font face="Courier New" color="#003258" size="4">public</font></b></a></li> | |
| 73 | <li><a href="private.html"><b><font face="Courier New" color="#003258" size="4">private</font></b></a></li> | |
| 74 | </ul> | |
| 75 | <p><a name="Ex1">Example 1</a>: | |
| 76 | <p><font face="Courier New">module module1 {<br> | |
| 77 | import from module2 all;<br> | |
| 78 | <br> | |
| 79 | const module2Type c_example1 := 4; //by default public, visible<br> | |
| 80 | const module2PublieType c_example2 := 4; //public, visible<br> | |
| 81 | const module2FriendType c_example3 := 4; //this is a friend module, visible<br> | |
| 82 | const module2PrivateType c_example4 := 4; //ERROR, not visible<br> | |
| 83 | }</font> | |
| 84 | <p><font face="Courier New">module module2 {<br> | |
| 85 | friend module1;<br> | |
| 86 | <br> | |
| 87 | type integer module2Type;//by default public, visible in every module<br> | |
| 88 | public type integer module2PublieType; //public, visible in every module<br> | |
| 89 | friend type integer module2FriendType; //friend, visible only in friend modules<br> | |
| 90 | private type module2PrivateType; //private, visible only in this module<br> | |
| 91 | }</font> | |
| 92 | <hr align="left" width="25%"> | |
| 93 | <hr align="left" width="25%"> | |
| 94 | </body> | |
| 95 | </html> |