2001-11-25 18:32:11 +00:00
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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2002-05-16 22:17:39 +00:00
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<link rel="stylesheet" type="text/css" href="../../../boost.css">
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2002-02-05 08:27:20 +00:00
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<title>Boost.Preprocessor - Tutorial examples preprocessed</title>
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2001-11-25 18:32:11 +00:00
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</head>
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2002-05-16 22:17:39 +00:00
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<body link="#0000ff" vlink="#800080">
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2002-02-05 08:27:20 +00:00
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<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
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"header">
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<tr>
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<td valign="top" width="300">
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<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../c++boost.gif" border="0"></a></h3>
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</td>
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<td valign="top">
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<h1 align="center">Boost.Preprocessor</h1>
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<h2 align="center">Tutorial examples preprocessed</h2>
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</td>
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</tr>
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</table>
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2001-11-25 18:32:11 +00:00
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<hr>
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<p>The following code snippets were produced by actually preprocessing the code
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snippets of the tutorial. After preprocessing the code was reformatted manually.</p>
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<hr>
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<p><strong><a name="Local Macro"></a><a href="tutorial.htm#Local Macro">EXAMPLE</a>:</strong>
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Use a Local Macro to avoid small scale repetition</p>
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2002-05-16 22:17:39 +00:00
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<pre>template<class T, int n>
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2001-11-25 18:32:11 +00:00
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vec<T,n>&
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operator +=
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( vec<T,n>&
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lhs
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, const vec<T,n>&
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rhs
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)
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{ for (int i=0; i<n; ++i)
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lhs(i) += rhs(i);
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return lhs;
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}
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template<class T, int n>
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vec<T,n>&
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operator -=
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( vec<T,n>&
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lhs
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, const vec<T,n>&
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rhs
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)
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{ for (int i=0; i<n; ++i)
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lhs(i) -= rhs(i);
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return lhs;
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}
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template<class T, int n>
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vec<T,n>&
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operator *=
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( vec<T,n>&
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lhs
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, const vec<T,n>&
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rhs
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)
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{ for (int i=0; i<n; ++i)
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lhs(i) *= rhs(i);
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return lhs;
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}
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template<class T, int n>
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vec<T,n>&
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operator /=
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( vec<T,n>&
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lhs
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, const vec<T,n>&
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rhs
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)
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{ for (int i=0; i<n; ++i)
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lhs(i) /= rhs(i);
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return lhs;
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}
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</pre>
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<hr>
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<p><strong><a name="UNUSED"></a><a href="tutorial.htm#UNUSED">EXAMPLE</a>:</strong>
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2001-12-28 11:06:53 +00:00
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Use BOOST_PP_EMPTY() as an unused parameter in Local Macro instantiations</p>
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2001-11-25 18:32:11 +00:00
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2002-05-16 22:17:39 +00:00
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<pre>template<class base>
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2001-11-25 18:32:11 +00:00
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typename implement_subscript_using_begin_subscript<base>::value_type&
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implement_subscript_using_begin_subscript<base>::operator[]
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( index_type
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i
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)
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{ return base::begin()[i];
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}
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template<class base>
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const typename implement_subscript_using_begin_subscript<base>::value_type&
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implement_subscript_using_begin_subscript<base>::operator[]
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( index_type
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i
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) const
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{ return base::begin()[i];
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}
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</pre>
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<hr>
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2001-12-28 11:06:53 +00:00
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<p><b><a name="CAT"></a><a href="tutorial.htm#CAT">EXAMPLE:</a></b> Use BOOST_PP_CAT instead of ## when necessary</p>
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2001-11-25 18:32:11 +00:00
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2002-05-16 22:17:39 +00:00
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<pre>enum
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2001-11-25 18:32:11 +00:00
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{ static_check_152 = (sizeof(int) <= sizeof(long)) ? 1 : -1
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};
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typedef char
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static_assert_152
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[ static_check_152
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];
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</pre>
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<hr>
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2001-12-28 11:06:53 +00:00
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<p><b><a name="STRINGIZE"></a><a href="tutorial.htm#STRINGIZE">EXAMPLE:</a></b> Use BOOST_PP_STRINGIZE instead of # whenever necessary</p>
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2002-05-16 22:17:39 +00:00
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<pre>#pragma message("examples.cpp" "(" "20" ") : " "TBD!")</pre>
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2001-11-25 18:32:11 +00:00
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<hr>
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<p><strong><a name="ENUM_PARAMS"></a><a href="tutorial.htm#ENUM_PARAMS">EXAMPLE</a>:</strong>
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Use:</p>
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<ul>
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2001-12-28 11:06:53 +00:00
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<li> BOOST_PP_ENUM_PARAMS,</li>
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<li> BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT,</li>
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<li> BOOST_PP_ENUM_PARAMS_WITH_DEFAULTS,</li>
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<li> BOOST_PP_ENUM_SHIFTED_PARAMS, or</li>
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<li>BOOST_PP_REPEAT, and</li>
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<li> BOOST_PP_COMMA_IF</li>
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2001-11-25 18:32:11 +00:00
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</ul>
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<p>to avoid O(N) repetition on lists in general</p>
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2002-05-16 22:17:39 +00:00
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<pre>struct make_type_list_end;
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2001-11-25 18:32:11 +00:00
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template
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< class T0=make_type_list_end
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, class T1=make_type_list_end
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, class T2=make_type_list_end
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, class T3=make_type_list_end
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, class T4=make_type_list_end
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, class T5=make_type_list_end
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, class T6=make_type_list_end
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, class T7=make_type_list_end
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>
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struct make_type_list
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{
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private:
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enum
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{ end = is_same<T0,make_type_list_end>::value
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};
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public:
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typedef typename
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type_if
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< end
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, type_cons_empty
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, type_cons
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< T0
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, typename
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type_inner_if
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< end
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, type_identity<end>
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, make_type_list
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< T1
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, T2
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, T3
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, T4
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, T5
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, T6
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, T7
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>
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>::type
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>
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>::type type;
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};
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</pre>
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<hr>
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<p><strong><a name="Token Look-Up"></a><a href="tutorial.htm#Token Look-Up">EXAMPLE</a>:</strong>
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2001-12-28 11:06:53 +00:00
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Use BOOST_PP_REPEAT and a Token Look-Up Function to eliminate categorical
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2001-11-25 18:32:11 +00:00
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repetition</p>
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2002-05-16 22:17:39 +00:00
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<pre>catch (bool t)
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2001-11-25 18:32:11 +00:00
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{ report_typeid(t);
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report_value(t);
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}
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catch (char t)
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{ report_typeid(t);
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report_value(t);
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}
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catch (signed char t)
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{ report_typeid(t);
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report_value(t);
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}
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catch (unsigned char t)
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{ report_typeid(t);
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report_value(t);
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}
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catch (short t)
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{ report_typeid(t);
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report_value(t);
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}
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catch (unsigned short t)
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{ report_typeid(t);
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report_value(t);
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}
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catch (int t)
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{ report_typeid(t);
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report_value(t);
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}
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catch (unsigned int t)
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{ report_typeid(t);
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report_value(t);
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}
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catch (long t)
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{ report_typeid(t);
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report_value(t);
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}
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catch (unsigned long t)
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{ report_typeid(t);
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report_value(t);
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}
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catch (float t)
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{ report_typeid(t);
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report_value(t);
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}
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catch (double t)
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{ report_typeid(t);
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report_value(t);
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}
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catch (long double t)
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{ report_typeid(t);
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report_value(t);
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}
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</pre>
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<hr>
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<p><strong><a name="2ND_REPEAT"></a><a href="tutorial.htm#2ND_REPEAT">EXAMPLE</a>:</strong>
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2001-12-28 11:06:53 +00:00
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Use BOOST_PP_REPEAT_2ND to avoid O(N*N) repetition</p>
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2001-11-25 18:32:11 +00:00
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2002-05-16 22:17:39 +00:00
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<pre>vec()
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2001-11-25 18:32:11 +00:00
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{
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}
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vec(T a0)
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{ (*this)[0] = a0;
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}
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vec(T a0, T a1)
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{ (*this)[0] = a0;
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(*this)[1] = a1;
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}
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vec(T a0, T a1, T a2)
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{ (*this)[0] = a0;
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(*this)[1] = a1;
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(*this)[2] = a2;
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}
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vec(T a0, T a1, T a2, T a3)
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{ (*this)[0] = a0;
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(*this)[1] = a1;
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(*this)[2] = a2;
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(*this)[3] = a3;
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}
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vec(T a0, T a1, T a2, T a3, T a4)
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{ (*this)[0] = a0;
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(*this)[1] = a1;
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(*this)[2] = a2;
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(*this)[3] = a3;
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(*this)[4] = a4;
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}
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vec(T a0, T a1, T a2, T a3, T a4, T a5)
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{ (*this)[0] = a0;
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(*this)[1] = a1;
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(*this)[2] = a2;
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(*this)[3] = a3;
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(*this)[4] = a4;
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(*this)[5] = a5;
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}
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vec(T a0, T a1, T a2, T a3, T a4, T a5, T a6)
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{ (*this)[0] = a0;
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(*this)[1] = a1;
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(*this)[2] = a2;
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(*this)[3] = a3;
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(*this)[4] = a4;
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(*this)[5] = a5;
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(*this)[6] = a6;
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}
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vec(T a0, T a1, T a2, T a3, T a4, T a5, T a6, T a7)
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{ (*this)[0] = a0;
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(*this)[1] = a1;
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(*this)[2] = a2;
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(*this)[3] = a3;
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(*this)[4] = a4;
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(*this)[5] = a5;
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(*this)[6] = a6;
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(*this)[7] = a7;
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}
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</pre>
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<p>
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<hr>
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<p><a name="IF"></a><a href="tutorial.htm#IF"><b>EXAMPLE:</b></a>
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2001-12-28 11:06:53 +00:00
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Use BOOST_PP_IF to implement special case for the first element</p>
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2001-11-25 18:32:11 +00:00
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2002-05-16 22:17:39 +00:00
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<pre>false == false;
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2001-11-25 18:32:11 +00:00
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true == true;
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</pre>
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<p>
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<hr>
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<p><a name="Arithmetic"></a><a href="tutorial.htm#Arithmetic"><B>EXAMPLE:</B></a> Use arithmetic, logical and comparison operations when necessary</p>
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2002-05-16 22:17:39 +00:00
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<pre>S, E0, E1
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2001-11-25 18:32:11 +00:00
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E0, S, E1
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E0, E1, S
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BAD PARAMS FOR SPECIAL_NUMBERED_LIST! E0, E1, E2, S</pre>
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<hr>
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2002-02-05 08:27:20 +00:00
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<p>Revised
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</p>
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<p><i>© Copyright <a href="http://www.housemarque.com">Housemarque Oy</a> 2002</i></p>
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2002-05-16 22:17:39 +00:00
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<p>Permission to copy, use, modify, sell and distribute this document is granted
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2002-02-05 08:27:20 +00:00
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provided this copyright notice appears in all copies. This document is provided
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"as is" without express or implied warranty, and with no claim as to its suitability
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2002-05-16 22:17:39 +00:00
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for any purpose.</p>
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2001-11-25 18:32:11 +00:00
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