Home Explore Help
Register Sign In
devn00b
/
EQ2EMu
9
3
Fork 0
Files Issues 76 Pull Requests 0 Wiki
Tree: 103859462d
Branches Tags
EQ2EMu
/
EQ2
/
source
/
depends
/
boost_1_72_0
/
libs
/
contract
/
doc
/
html
/
BOOST_CONTRACT_OLDOF.html

BOOST_CONTRACT_OLDOF.html 6.1 KB
History Raw

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172 
  1. <html>
    2. 

  2. <head>
    3. 

  3. <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
    4. 

  4. <title>Macro BOOST_CONTRACT_OLDOF</title>
    5. 

  5. <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css">
    6. 

  6. <meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
    7. 

  7. <link rel="home" href="index.html" title="Chapter&#160;1.&#160;Boost.Contract 1.0.0">
    8. 

  8. <link rel="up" href="reference.html#header.boost.contract.old_hpp" title="Header &lt;boost/contract/old.hpp&gt;">
    9. 

  9. <link rel="prev" href="boost/contract/copy_old_idm45394998938528.html" title="Function copy_old">
    10. 

  10. <link rel="next" href="BOOST_CO_idm45394998912688.html" title="Macro BOOST_CONTRACT_NAMED_OVERRIDE">
    11. 

  11. </head>
    12. 

  12. <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
    13. 

  13. <table cellpadding="2" width="100%"><tr>
    14. 

  14. <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td>
    15. 

  15. <td align="center"><a href="../../../../index.html">Home</a></td>
    16. 

  16. <td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td>
    17. 

  17. <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
    18. 

  18. <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
    19. 

  19. <td align="center"><a href="../../../../more/index.htm">More</a></td>
    20. 

  20. </tr></table>
    21. 

  21. <hr>
    22. 

  22. <div class="spirit-nav">
    23. 

  23. <a accesskey="p" href="boost/contract/copy_old_idm45394998938528.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="reference.html#header.boost.contract.old_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="BOOST_CO_idm45394998912688.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
    24. 

  24. </div>
    25. 

  25. <div class="refentry">
    26. 

  26. <a name="BOOST_CONTRACT_OLDOF"></a><div class="titlepage"></div>
    27. 

  27. <div class="refnamediv">
    28. 

  28. <h2><span class="refentrytitle">Macro BOOST_CONTRACT_OLDOF</span></h2>
    29. 

  29. <p>BOOST_CONTRACT_OLDOF &#8212; Macro typically used to copy an old value expression and assign it to an old value pointer. </p>
    30. 

  30. </div>
    31. 

  31. <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
    32. 

  32. <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="reference.html#header.boost.contract.old_hpp" title="Header &lt;boost/contract/old.hpp&gt;">boost/contract/old.hpp</a>&gt;
    33. 

  33. 

  34. </span>BOOST_CONTRACT_OLDOF(...)</pre></div>
    35. 

  35. <div class="refsect1">
    36. 

  36. <a name="idm45707994093488"></a><h2>Description</h2>
    37. 

  37. <p>The expression expanded by this macro should be assigned to an old value pointer of type <code class="computeroutput"><a class="link" href="boost/contract/old_ptr.html" title="Class template old_ptr">boost::contract::old_ptr</a></code> or  <code class="computeroutput"><a class="link" href="boost/contract/old_ptr_if_copyable.html" title="Class template old_ptr_if_copyable">boost::contract::old_ptr_if_copyable</a></code>. This is an overloaded variadic macro and it can be used in the following different ways.</p>
    38. 

  38. <p>1. From within virtual public functions and public functions overrides:</p>
    39. 

  39. <pre class="programlisting"><span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">v</span><span class="special">,</span> <span class="identifier">old_expr</span><span class="special">)</span>
    40. 

  40. </pre>
    41. 

  41. <p>2. From all other operations:</p>
    42. 

  42. <pre class="programlisting"><span class="identifier">BOOST_CONTRACT_OLDOF</span><span class="special">(</span><span class="identifier">old_expr</span><span class="special">)</span>
    43. 

  43. </pre>
    44. 

  44. <p>Where:</p>
    45. 

  45. <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
    46. 

  46. <li class="listitem"><p><code class="computeroutput"><span class="bold"><strong>v</strong></span></code> is the extra parameter of type  <code class="computeroutput"><a class="link" href="boost/contract/virtual_.html" title="Class virtual_">boost::contract::virtual_</a></code><code class="computeroutput">*</code> and default value <code class="computeroutput">0</code> from the enclosing virtual public function or public function overrides declaring the contract. </p></li>
    47. 

  47. <li class="listitem"><p><code class="computeroutput"><span class="bold"><strong>old_expr</strong></span></code> is the expression to be evaluated and copied into the old value pointer. (This is not a variadic macro parameter so any comma it might contain must be protected by round parenthesis and <code class="computeroutput">BOOST_CONTRACT_OLDOF(v, (old_expr))</code> will always work.)</p></li>
    48. 

  48. </ul></div>
    49. 

  49. <p>
    50. 

  50. On compilers that do not support variadic macros, programmers can manually copy old value expressions without using this macro (see  <a class="link" href="boost_contract/extras.html#boost_contract.extras.no_macros__and_no_variadic_macros_" title="No Macros (and No Variadic Macros)"> No Macros</a>).</p>
    51. 

  51. <p><span class="bold"><strong>See Also:</strong></span></p>
    52. 

  52. <p> <a class="link" href="boost_contract/tutorial.html#boost_contract.tutorial.old_values" title="Old Values"> Old Values</a> </p>
    53. 

  53. <p>
    54. 

  54. </p>
    55. 

  55. <p>
    56. 

  56. </p>
    57. 

  57. </div>
    58. 

  58. </div>
    59. 

  59. <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
    60. 

  60. <td align="left"></td>
    61. 

  61. <td align="right"><div class="copyright-footer">Copyright &#169; 2008-2019 Lorenzo Caminiti<p>
    62. 

  62.         Distributed under the Boost Software License, Version 1.0 (see accompanying
    63. 

  63.         file LICENSE_1_0.txt or a copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
    64. 

  64.       </p>
    65. 

  65. </div></td>
    66. 

  66. </tr></table>
    67. 

  67. <hr>
    68. 

  68. <div class="spirit-nav">
    69. 

  69. <a accesskey="p" href="boost/contract/copy_old_idm45394998938528.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="reference.html#header.boost.contract.old_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="BOOST_CO_idm45394998912688.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
    70. 

  70. </div>
    71. 

  71. </body>
    72. 

  72. </html>
    73.