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initial checkin [SVN r11780]
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<title>Boost PREPROCESSOR library</title>
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<h1>Boost PREPROCESSOR library: Tutorial examples preprocessed</h1>
<p>The following code snippets were produced by actually preprocessing the code
snippets of the tutorial. After preprocessing the code was reformatted manually.</p>
<hr>
<p><strong><a name="Local Macro"></a><a href="tutorial.htm#Local Macro">EXAMPLE</a>:</strong>
Use a Local Macro to avoid small scale repetition</p>
<blockquote>
<pre>template&lt;class T, int n&gt;
vec&lt;T,n&gt;&
operator +=
( vec&lt;T,n&gt;&
lhs
, const vec&lt;T,n&gt;&
rhs
)
{ for (int i=0; i&lt;n; ++i)
lhs(i) += rhs(i);
return lhs;
}
template&lt;class T, int n&gt;
vec&lt;T,n&gt;&
operator -=
( vec&lt;T,n&gt;&
lhs
, const vec&lt;T,n&gt;&
rhs
)
{ for (int i=0; i&lt;n; ++i)
lhs(i) -= rhs(i);
return lhs;
}
template&lt;class T, int n&gt;
vec&lt;T,n&gt;&
operator *=
( vec&lt;T,n&gt;&
lhs
, const vec&lt;T,n&gt;&
rhs
)
{ for (int i=0; i&lt;n; ++i)
lhs(i) *= rhs(i);
return lhs;
}
template&lt;class T, int n&gt;
vec&lt;T,n&gt;&
operator /=
( vec&lt;T,n&gt;&
lhs
, const vec&lt;T,n&gt;&
rhs
)
{ for (int i=0; i&lt;n; ++i)
lhs(i) /= rhs(i);
return lhs;
}
</pre>
</blockquote>
<hr>
<p><strong><a name="UNUSED"></a><a href="tutorial.htm#UNUSED">EXAMPLE</a>:</strong>
PREPROCESSOR -> PP. WHILE documented. [SVN r12162]
2001-12-28 11:06:53 +00:00
Use BOOST_PP_EMPTY() as an unused parameter in Local Macro instantiations</p>
initial checkin [SVN r11780]
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<blockquote>
<pre>template&lt;class base&gt;
typename implement_subscript_using_begin_subscript&lt;base&gt;::value_type&
implement_subscript_using_begin_subscript&lt;base&gt;::operator[]
( index_type
i
)
{ return base::begin()[i];
}
template&lt;class base&gt;
const typename implement_subscript_using_begin_subscript&lt;base&gt;::value_type&
implement_subscript_using_begin_subscript&lt;base&gt;::operator[]
( index_type
i
) const
{ return base::begin()[i];
}
</pre>
</blockquote>
<hr>
PREPROCESSOR -> PP. WHILE documented. [SVN r12162]
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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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<blockquote>
<pre>enum
{ static_check_152 = (sizeof(int) &lt;= sizeof(long)) ? 1 : -1
};
typedef char
static_assert_152
[ static_check_152
];
</pre>
</blockquote>
<hr>
PREPROCESSOR -> PP. WHILE documented. [SVN r12162]
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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>
initial checkin [SVN r11780]
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<blockquote>
<pre>#pragma message("examples.cpp" "(" "20" ") : " "TBD!")</pre>
</blockquote>
<hr>
<p><strong><a name="ENUM_PARAMS"></a><a href="tutorial.htm#ENUM_PARAMS">EXAMPLE</a>:</strong>
Use:</p>
<ul>
PREPROCESSOR -> PP. WHILE documented. [SVN r12162]
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<li> BOOST_PP_ENUM_PARAMS,</li>
<li> BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT,</li>
<li> BOOST_PP_ENUM_PARAMS_WITH_DEFAULTS,</li>
<li> BOOST_PP_ENUM_SHIFTED_PARAMS, or</li>
<li>BOOST_PP_REPEAT, and</li>
<li> BOOST_PP_COMMA_IF</li>
initial checkin [SVN r11780]
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</ul>
<p>to avoid O(N) repetition on lists in general</p>
<blockquote>
<pre>struct make_type_list_end;
template
&lt; class T0=make_type_list_end
, class T1=make_type_list_end
, class T2=make_type_list_end
, class T3=make_type_list_end
, class T4=make_type_list_end
, class T5=make_type_list_end
, class T6=make_type_list_end
, class T7=make_type_list_end
&gt;
struct make_type_list
{
private:
enum
{ end = is_same&lt;T0,make_type_list_end&gt;::value
};
public:
typedef typename
type_if
&lt; end
, type_cons_empty
, type_cons
&lt; T0
, typename
type_inner_if
&lt; end
, type_identity&lt;end&gt;
, make_type_list
&lt; T1
, T2
, T3
, T4
, T5
, T6
, T7
&gt;
&gt;::type
&gt;
&gt;::type type;
};
</pre>
</blockquote>
<hr>
<p><strong><a name="Token Look-Up"></a><a href="tutorial.htm#Token Look-Up">EXAMPLE</a>:</strong>
PREPROCESSOR -> PP. WHILE documented. [SVN r12162]
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Use BOOST_PP_REPEAT and a Token Look-Up Function to eliminate categorical
initial checkin [SVN r11780]
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repetition</p>
<blockquote>
<pre>catch (bool t)
{ report_typeid(t);
report_value(t);
}
catch (char t)
{ report_typeid(t);
report_value(t);
}
catch (signed char t)
{ report_typeid(t);
report_value(t);
}
catch (unsigned char t)
{ report_typeid(t);
report_value(t);
}
catch (short t)
{ report_typeid(t);
report_value(t);
}
catch (unsigned short t)
{ report_typeid(t);
report_value(t);
}
catch (int t)
{ report_typeid(t);
report_value(t);
}
catch (unsigned int t)
{ report_typeid(t);
report_value(t);
}
catch (long t)
{ report_typeid(t);
report_value(t);
}
catch (unsigned long t)
{ report_typeid(t);
report_value(t);
}
catch (float t)
{ report_typeid(t);
report_value(t);
}
catch (double t)
{ report_typeid(t);
report_value(t);
}
catch (long double t)
{ report_typeid(t);
report_value(t);
}
</pre>
</blockquote>
<hr>
<p><strong><a name="2ND_REPEAT"></a><a href="tutorial.htm#2ND_REPEAT">EXAMPLE</a>:</strong>
PREPROCESSOR -> PP. WHILE documented. [SVN r12162]
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Use BOOST_PP_REPEAT_2ND to avoid O(N*N) repetition</p>
initial checkin [SVN r11780]
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<blockquote>
<pre>vec()
{
}
vec(T a0)
{ (*this)[0] = a0;
}
vec(T a0, T a1)
{ (*this)[0] = a0;
(*this)[1] = a1;
}
vec(T a0, T a1, T a2)
{ (*this)[0] = a0;
(*this)[1] = a1;
(*this)[2] = a2;
}
vec(T a0, T a1, T a2, T a3)
{ (*this)[0] = a0;
(*this)[1] = a1;
(*this)[2] = a2;
(*this)[3] = a3;
}
vec(T a0, T a1, T a2, T a3, T a4)
{ (*this)[0] = a0;
(*this)[1] = a1;
(*this)[2] = a2;
(*this)[3] = a3;
(*this)[4] = a4;
}
vec(T a0, T a1, T a2, T a3, T a4, T a5)
{ (*this)[0] = a0;
(*this)[1] = a1;
(*this)[2] = a2;
(*this)[3] = a3;
(*this)[4] = a4;
(*this)[5] = a5;
}
vec(T a0, T a1, T a2, T a3, T a4, T a5, T a6)
{ (*this)[0] = a0;
(*this)[1] = a1;
(*this)[2] = a2;
(*this)[3] = a3;
(*this)[4] = a4;
(*this)[5] = a5;
(*this)[6] = a6;
}
vec(T a0, T a1, T a2, T a3, T a4, T a5, T a6, T a7)
{ (*this)[0] = a0;
(*this)[1] = a1;
(*this)[2] = a2;
(*this)[3] = a3;
(*this)[4] = a4;
(*this)[5] = a5;
(*this)[6] = a6;
(*this)[7] = a7;
}
</pre>
</blockquote>
<p>
<hr>
<p><a name="IF"></a><a href="tutorial.htm#IF"><b>EXAMPLE:</b></a>
PREPROCESSOR -> PP. WHILE documented. [SVN r12162]
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Use BOOST_PP_IF to implement special case for the first element</p>
initial checkin [SVN r11780]
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<blockquote>
<pre>false == false;
true == true;
</pre>
</blockquote>
<p>
<hr>
<p><a name="Arithmetic"></a><a href="tutorial.htm#Arithmetic"><B>EXAMPLE:</B></a> Use arithmetic, logical and comparison operations when necessary</p>
<blockquote>
<pre>S, E0, E1
E0, S, E1
E0, E1, S
BAD PARAMS FOR SPECIAL_NUMBERED_LIST! E0, E1, E2, S</pre>
</blockquote>
<hr>
Official copyright holder in Finland is "Housemarque Oy" [SVN r11883]
2001-12-03 21:20:27 +00:00
<p><EFBFBD> Copyright Housemarque Oy 2001</p>
initial checkin [SVN r11780]
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<p>Permission to copy, use, modify, sell and distribute this document is granted
provided this copyright notice appears in all copies. This document is provided
"as is" without express or implied warranty, and with no claim as to its suitability
for any purpose. </p>
<p>Updated: <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan --><!--webbot bot="Timestamp" endspan i-checksum="15246" -->
<p></p>
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