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boost-1.21
| Author | SHA1 | Date | |
|---|---|---|---|
|
d944c6538f |
@@ -100,7 +100,7 @@ Assignment
|
||||
</UL>
|
||||
|
||||
<h3>See also</h3>
|
||||
<a href="http://www.sgi.com/tech/stl/DefaultConstructible.html">DefaultConstructible</A>
|
||||
<a href="http://www.sgi.com/Technology/STL/DefaultConstructible.html">DefaultConstructible</A>
|
||||
and
|
||||
<A href="./CopyConstructible.html">CopyConstructible</A>
|
||||
|
||||
|
||||
@@ -11,7 +11,7 @@
|
||||
-- purpose. It is provided "as is" without express or implied warranty.
|
||||
-->
|
||||
<Head>
|
||||
<Title>Copy Constructible</Title>
|
||||
<Title>CopyConstructible</Title>
|
||||
</HEAD>
|
||||
<BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b"
|
||||
ALINK="#ff0000">
|
||||
@@ -19,10 +19,10 @@
|
||||
ALT="C++ Boost" width="277" height="86">
|
||||
<!--end header-->
|
||||
<BR Clear>
|
||||
<H1>Copy Constructible</H1>
|
||||
<H1>CopyConstructible</H1>
|
||||
|
||||
<h3>Description</h3>
|
||||
A type is Copy Constructible if it is possible to copy objects of that
|
||||
A type is CopyConstructible if it is possible to copy objects of that
|
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type.
|
||||
|
||||
<h3>Notation</h3>
|
||||
@@ -32,7 +32,7 @@ type.
|
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<tt>T</tt>
|
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</TD>
|
||||
<TD VAlign=top>
|
||||
is type that is a model of Copy Constructible
|
||||
is type that is a model of CopyConstructible
|
||||
</TD>
|
||||
</TR>
|
||||
|
||||
@@ -194,9 +194,9 @@ denotes the address of <tt>u</tt>
|
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|
||||
<h3>See also</h3>
|
||||
<A
|
||||
href="http://www.sgi.com/tech/stl/DefaultConstructible.html">Default Constructible</A>
|
||||
href="http://www.sgi.com/Technology/STL/DefaultConstructible.html">DefaultConstructible</A>
|
||||
and
|
||||
<A hrefa="./Assignable.html">Assignable</A>
|
||||
<A href="http://www.sgi.com/Technology/STL/Assignable.html">Assignable</A>
|
||||
|
||||
<br>
|
||||
<HR>
|
||||
|
||||
@@ -196,7 +196,7 @@ satisfies the definition of a <i>partial ordering</i>. The definition of
|
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a <i>strict weak ordering</i> is stricter, and the definition of a
|
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<i>total ordering</i> is stricter still.
|
||||
<h3>See also</h3>
|
||||
<A href="http://www.sgi.com/tech/stl/EqualityComparable.html">EqualityComparable</A>, <A href="http://www.sgi.com/tech/stl/StrictWeakOrdering.html">StrictWeakOrdering</A>
|
||||
<A href="http://www.sgi.com/Technology/STL/EqualityComparable.html">EqualityComparable</A>, <A href="http://www.sgi.com/Technology/STL/StrictWeakOrdering.html">StrictWeakOrdering</A>
|
||||
|
||||
|
||||
|
||||
|
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@@ -21,21 +21,21 @@
|
||||
|
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<H2>
|
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<A NAME="concept:MultiPassInputIterator"></A>
|
||||
Multi-Pass Input Iterator
|
||||
MultiPassInputIterator
|
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</H2>
|
||||
|
||||
This concept is a refinement of <a
|
||||
href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>,
|
||||
href="http://www.sgi.com/Technology/STL/InputIterator.html">InputIterator</a>,
|
||||
adding the requirements that the iterator can be used to make multiple
|
||||
passes through a range, and that if <TT>it1 == it2</TT> and
|
||||
<TT>it1</TT> is dereferenceable then <TT>++it1 == ++it2</TT>. The
|
||||
Multi-Pass Input Iterator is very similar to the <a
|
||||
href="http://www.sgi.com/tech/stl/ForwardIterator.hmtl">Forward Iterator</a>. The
|
||||
MultiPassInputIterator is very similar to the <a
|
||||
href="http://www.sgi.com/Technology/STL/ForwardIterator.hmtl">ForwardIterator</a>. The
|
||||
only difference is that a <a
|
||||
href="http://www.sgi.com/tech/stl/ForwardIterator.hmtl">Forward Iterator</a>
|
||||
href="http://www.sgi.com/Technology/STL/ForwardIterator.hmtl">ForwardIterator</a>
|
||||
requires the <TT>reference</TT> type to be <TT>value_type&</TT>, whereas
|
||||
MultiPassInputIterator is like <a
|
||||
href="http://www.sgi.com/tech/stl/InputIterator.html">Input Iterator</a>
|
||||
href="http://www.sgi.com/Technology/STL/InputIterator.html">InputIterator</a>
|
||||
in that the <TT>reference</TT> type merely has to be convertible to
|
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<TT>value_type</TT>.
|
||||
|
||||
@@ -44,29 +44,29 @@ in that the <TT>reference</TT> type merely has to be convertible to
|
||||
|
||||
comments by Valentin Bonnard:
|
||||
|
||||
<p> I think that introducing Multi-Pass Input Iterator isn't the right
|
||||
solution. Do you also want to define Multi-Pass Bidirectionnal Iterator
|
||||
and Multi-Pass Random Access Iterator ? I don't, definitly. It only
|
||||
<p> I think that introducing MultiPassInputIterator isn't the right
|
||||
solution. Do you also want to define MultiPassBidirectionnalIterator
|
||||
and MultiPassRandomAccessIterator ? I don't, definitly. It only
|
||||
confuses the issue. The problem lies into the existing hierarchy of
|
||||
iterators, which mixes movabillity, modifiabillity and lvalue-ness,
|
||||
and these are clearly independant.
|
||||
|
||||
<p> The terms Forward, Bidirectionnal and Random Access are about
|
||||
<p> The terms Forward, Bidirectionnal and RandomAccess are about
|
||||
movabillity and shouldn't be used to mean anything else. In a
|
||||
completly orthogonal way, iterators can be immutable, mutable, or
|
||||
neither. Lvalueness of iterators is also orthogonal with
|
||||
immutabillity. With these clean concepts, your Multi-Pass Input Iterator
|
||||
is just called a Forward Iterator.
|
||||
immutabillity. With these clean concepts, your MultiPassInputIterator
|
||||
is just called a ForwardIterator.
|
||||
|
||||
<p>
|
||||
Other translations are:<br>
|
||||
std::Forward Iterator -> ForwardIterator & Lvalue Iterator<br>
|
||||
std::Bidirectionnal Iterator -> Bidirectionnal Iterator & Lvalue Iterator<br>
|
||||
std::Random Access Iterator -> Random Access Iterator & Lvalue Iterator<br>
|
||||
std::ForwardIterator -> ForwardIterator & LvalueIterator<br>
|
||||
std::BidirectionnalIterator -> BidirectionnalIterator & LvalueIterator<br>
|
||||
std::RandomAccessIterator -> RandomAccessIterator & LvalueIterator<br>
|
||||
|
||||
<p>
|
||||
Note that in practice the only operation not allowed on my
|
||||
Forward Iterator which is allowed on std::Forward Iterator is
|
||||
ForwardIterator which is allowed on std::ForwardIterator is
|
||||
<tt>&*it</tt>. I think that <tt>&*</tt> is rarely needed in generic code.
|
||||
|
||||
<p>
|
||||
@@ -75,9 +75,9 @@ reply by Jeremy Siek:
|
||||
<p>
|
||||
The above analysis by Valentin is right on. Of course, there is
|
||||
the problem with backward compatibility. The current STL implementations
|
||||
are based on the old definition of Forward Iterator. The right course
|
||||
of action is to get Forward Iterator, etc. changed in the C++ standard.
|
||||
Once that is done we can drop Multi-Pass Input Iterator.
|
||||
are based on the old definition of ForwardIterator. The right course
|
||||
of action is to get ForwardIterator, etc. changed in the C++ standard.
|
||||
Once that is done we can drop MultiPassInputIterator.
|
||||
|
||||
|
||||
<br>
|
||||
|
||||
@@ -5,7 +5,7 @@
|
||||
content="text/html; charset=iso-8859-1">
|
||||
<meta name="Template"
|
||||
content="C:\PROGRAM FILES\MICROSOFT OFFICE\OFFICE\html.dot">
|
||||
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
|
||||
<meta name="GENERATOR" content="Microsoft FrontPage Express 2.0">
|
||||
<title>Call Traits</title>
|
||||
</head>
|
||||
|
||||
@@ -751,7 +751,7 @@ Hinnant and John Maddock.</p>
|
||||
<p>Maintained by <a href="mailto:John_Maddock@compuserve.com">John
|
||||
Maddock</a>, the latest version of this file can be found at <a
|
||||
href="http://www.boost.org/">www.boost.org</a>, and the boost
|
||||
discussion list at <a href="http://www.yahoogroups.com/list/boost">www.yahoogroups.com/list/boost</a>.</p>
|
||||
discussion list at <a href="http://www.egroups.com/list/boost">www.egroups.com/list/boost</a>.</p>
|
||||
|
||||
<p>.</p>
|
||||
|
||||
|
||||
@@ -5,16 +5,15 @@
|
||||
content="text/html; charset=iso-8859-1">
|
||||
<meta name="Template"
|
||||
content="C:\PROGRAM FILES\MICROSOFT OFFICE\OFFICE\html.dot">
|
||||
<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
|
||||
<title>Header </title>
|
||||
<boost/compressed_pair.hpp>
|
||||
<meta name="GENERATOR" content="Microsoft FrontPage Express 2.0">
|
||||
<title>Header <boost/compressed_pair.hpp></title>
|
||||
</head>
|
||||
|
||||
<body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
|
||||
vlink="#800080">
|
||||
|
||||
<h2><img src="../../c++boost.gif" width="276" height="86">Header
|
||||
<<a href="../../boost/detail/compressed_pair.hpp">boost/compressed_pair.hpp</a>></h2>
|
||||
<<a href="../../boost/detail/call_traits.hpp">boost/compressed_pair.hpp</a>></h2>
|
||||
|
||||
<p>All of the contents of <boost/compressed_pair.hpp> are
|
||||
defined inside namespace boost.</p>
|
||||
@@ -86,7 +85,7 @@ Hinnant and John Maddock.</p>
|
||||
<p>Maintained by <a href="mailto:John_Maddock@compuserve.com">John
|
||||
Maddock</a>, the latest version of this file can be found at <a
|
||||
href="http://www.boost.org">www.boost.org</a>, and the boost
|
||||
discussion list at <a href="http://www.yahoogroups.com/list/boost">www.yahoogroups.com/list/boost</a>.</p>
|
||||
discussion list at <a href="http://www.egroups.com/list/boost">www.egroups.com/list/boost</a>.</p>
|
||||
|
||||
<p> </p>
|
||||
</body>
|
||||
|
||||
@@ -308,7 +308,7 @@ implementation, the <tt>difference_type</tt> for any variable-length signed
|
||||
integer type <tt>T</tt> is <tt>T</tt> itself.
|
||||
|
||||
<hr>
|
||||
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->08 Mar 2001<!--webbot bot="Timestamp" endspan i-checksum="14892" --></p>
|
||||
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->28 Feb 2001<!--webbot bot="Timestamp" endspan i-checksum="14390" --></p>
|
||||
<p><EFBFBD> Copyright Jeremy Siek 2000. 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"
|
||||
|
||||
@@ -422,7 +422,7 @@ a,b,c,d,e,f,g,
|
||||
<hr>
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->08 Mar 2001<!--webbot bot="Timestamp" endspan i-checksum="14892" -->
|
||||
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->28 Feb 2001<!--webbot bot="Timestamp" endspan i-checksum="14390" -->
|
||||
|
||||
|
||||
<p>© Copyright Jeremy Siek and David Abrahams 2001. Permission to
|
||||
|
||||
@@ -170,8 +170,7 @@ struct iterator_adaptor;
|
||||
<td>The <tt>value_type</tt> of the resulting iterator, unless const. If
|
||||
Value is <tt>const X</tt> the
|
||||
<tt>value_type</tt> will be (<i>non-</i><tt>const</tt>) <tt>X</tt><a href=
|
||||
"#1">[1]</a>. If the <tt>value_type</tt> you wish to use is an abstract
|
||||
base class see note <a href="#5">[5]</a>.<br>
|
||||
"#1">[1]</a>.<br>
|
||||
<b>Default:</b>
|
||||
<tt>std::iterator_traits<BaseType>::value_type</tt> <a href=
|
||||
"#2">[2]</a>
|
||||
@@ -311,13 +310,13 @@ iterator_adaptor<foo_iterator, foo_policies,
|
||||
<th>Required for Iterator Categories
|
||||
|
||||
<tr>
|
||||
<td><tt>initialize</tt>
|
||||
<td><tt>dereference</tt>
|
||||
|
||||
<td>optionally modify base iterator during iterator construction
|
||||
<td>returns an element of the iterator's <tt>reference</tt> type
|
||||
|
||||
<td><tt>*p</tt>, <tt>p[n]</tt>
|
||||
|
||||
<td>constructors
|
||||
|
||||
<td rowspan="4"><a href=
|
||||
<td rowspan="3"><a href=
|
||||
"http://www.sgi.com/tech/stl/InputIterator.html">Input</a>/ <a href=
|
||||
"http://www.sgi.com/tech/stl/OutputIterator.html">Output</a>/ <a href=
|
||||
"http://www.sgi.com/tech/stl/ForwardIterator.html">Forward</a>/ <a
|
||||
@@ -326,15 +325,6 @@ iterator_adaptor<foo_iterator, foo_policies,
|
||||
<a href="http://www.sgi.com/tech/stl/RandomAccessIterator.html">Random
|
||||
Access</a>
|
||||
|
||||
|
||||
<tr>
|
||||
<td><tt>dereference</tt>
|
||||
|
||||
<td>returns an element of the iterator's <tt>reference</tt> type
|
||||
|
||||
<td><tt>*p</tt>, <tt>p[n]</tt>
|
||||
|
||||
|
||||
<tr>
|
||||
<td><tt>equal</tt>
|
||||
|
||||
@@ -414,10 +404,6 @@ iterator_adaptor<foo_iterator, foo_policies,
|
||||
<pre>
|
||||
struct <a name="default_iterator_policies">default_iterator_policies</a>
|
||||
{
|
||||
template <class BaseType>
|
||||
void initialize(BaseType&)
|
||||
{ }
|
||||
|
||||
template <class Reference, class BaseType>
|
||||
Reference dereference(type<Reference>, const BaseType& x) const
|
||||
{ return *x; }
|
||||
@@ -843,24 +829,10 @@ bool operator==(const iterator_adaptor<B1,P,V1,R1,P1,C,D>&,
|
||||
returning a reference could cause serious memory problems due to the
|
||||
reference being bound to a temporary object whose lifetime ends inside of
|
||||
the <tt>operator[]</tt>.
|
||||
|
||||
<p><a name="5">[5]</a>
|
||||
The <tt>value_type</tt> of an iterator may not be
|
||||
an abstract base class, however many common uses of iterators
|
||||
never need the <tt>value_type</tt>, only the <tt>reference</tt> type.
|
||||
If you wish to create such an iterator adaptor, use a dummy
|
||||
type such as <tt>char</tt> for the <tt>Value</tt> parameter,
|
||||
and use a reference to your abstract base class for
|
||||
the <tt>Reference</tt> parameter. Note that such an iterator
|
||||
does not fulfill the C++ standards requirements for a
|
||||
<a href= "http://www.sgi.com/tech/stl/ForwardIterator.html">
|
||||
Forward Iterator</a>, so you will need to use a less restrictive
|
||||
iterator category such as <tt>std::input_iterator_tag</tt>.
|
||||
|
||||
<hr>
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->19 Mar 2001<!--webbot bot="Timestamp" endspan i-checksum="14895" -->
|
||||
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->09 Mar 2001<!--webbot bot="Timestamp" endspan i-checksum="14894" -->
|
||||
|
||||
|
||||
<p>© Copyright Dave Abrahams and Jeremy Siek 2001. Permission to copy,
|
||||
|
||||
@@ -585,7 +585,7 @@ complicated than the old one, we think it's worth it to make the library more
|
||||
useful in real world. Alexy Gurtovoy contributed the code which supports the new
|
||||
usage idiom while allowing the library remain backward-compatible.</p>
|
||||
<hr>
|
||||
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->10 Feb 2001<!--webbot bot="Timestamp" endspan i-checksum="14373" --></p>
|
||||
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->28 Sep 2000<!--webbot bot="Timestamp" endspan i-checksum="14938" --></p>
|
||||
<p><EFBFBD> Copyright David Abrahams and Beman Dawes 1999-2000. 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
|
||||
|
||||
@@ -371,7 +371,7 @@ Betty
|
||||
</pre>
|
||||
|
||||
<hr>
|
||||
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->08 Mar 2001<!--webbot bot="Timestamp" endspan i-checksum="14892" --></p>
|
||||
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->28 Feb 2001<!--webbot bot="Timestamp" endspan i-checksum="14390" --></p>
|
||||
<p><EFBFBD> Copyright Jeremy Siek 2000. 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"
|
||||
|
||||
@@ -312,7 +312,7 @@ simply use <tt>reverse_iterator_generator</tt> twice!<br><br>
|
||||
|
||||
|
||||
<p>Revised
|
||||
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->08 Mar 2001<!--webbot bot="Timestamp" endspan i-checksum="14892" -->
|
||||
<!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->28 Feb 2001<!--webbot bot="Timestamp" endspan i-checksum="14390" -->
|
||||
|
||||
|
||||
<p>© Copyright Jeremy Siek 2000. Permission to copy, use, modify, sell
|
||||
|
||||
2
tie.html
2
tie.html
@@ -64,7 +64,7 @@ pair of iterators is assigned to the iterator variables <TT>i</TT> and
|
||||
|
||||
<P>
|
||||
Here is another example that uses <TT>tie()</TT> for handling operations with <a
|
||||
href="http://www.sgi.com/tech/stl/set.html"><TT>std::set</TT></a>.
|
||||
href="http://www.sgi.com/Technology/STL/set.html"><TT>std::set</TT></a>.
|
||||
|
||||
<P>
|
||||
<PRE>
|
||||
|
||||
@@ -71,11 +71,8 @@ public:
|
||||
|
||||
<p>
|
||||
The following is an example of how to use the
|
||||
<tt>transform_iterator_generator</tt> class to iterate through a range
|
||||
of numbers, multiplying each of them by 2 when they are dereferenced.
|
||||
The <tt>boost::binder1st</tt> class is used instead of the standard
|
||||
one because tranform iterator requires the function object to be
|
||||
Default Constructible.
|
||||
<tt>transform_iterator_generator</tt> class to iterate through a range of
|
||||
numbers, multiplying each of them by 2 when they are dereferenced.
|
||||
|
||||
<p>
|
||||
<PRE>
|
||||
@@ -83,18 +80,16 @@ Default Constructible.
|
||||
#include <iostream>
|
||||
#include <boost/iterator_adaptors.hpp>
|
||||
|
||||
// definition of class boost::binder1st and function boost::bind1st() ...
|
||||
|
||||
int
|
||||
main(int, char*[])
|
||||
{
|
||||
int x[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
|
||||
|
||||
typedef boost::binder1st< std::multiplies<int> > Function;
|
||||
typedef std::binder1st< std::multiplies<int> > Function;
|
||||
typedef boost::transform_iterator_generator<Function, int*>::type doubling_iterator;
|
||||
|
||||
doubling_iterator i(x, boost::bind1st(std::multiplies<int>(), 2)),
|
||||
i_end(x + sizeof(x)/sizeof(int), boost::bind1st(std::multiplies<int>(), 2));
|
||||
doubling_iterator i(x, std::bind1st(std::multiplies<int>(), 2)),
|
||||
i_end(x + sizeof(x)/sizeof(int), std::bind1st(std::multiplies<int>(), 2));
|
||||
|
||||
std::cout << "multiplying the array by 2:" << std::endl;
|
||||
while (i != i_end)
|
||||
@@ -116,17 +111,14 @@ The output from this part is:
|
||||
</TR>
|
||||
|
||||
<TR>
|
||||
<TD><a
|
||||
href="http://www.sgi.com/tech/stl/AdaptableUnaryFunction.html"><tt>AdaptableUnaryFunction</tt></a></TD>
|
||||
<TD><a href="http://www.sgi.com/tech/stl/AdaptableUnaryFunction.html"><tt>AdaptableUnaryFunction</tt></a></TD>
|
||||
<TD>The function object that transforms each element in the iterator
|
||||
range. The <tt>argument_type</tt> of the function object must match
|
||||
the value type of the base iterator. The <tt>result_type</tt> of the
|
||||
function object will be the resulting iterator's
|
||||
<tt>value_type</tt>. If you want the resulting iterator to behave as
|
||||
an iterator, the result of the function should be solely a function of
|
||||
its argument. Also, the function object must be <a
|
||||
href="http://www.sgi.com/tech/stl/DefaultConstructible.html"> Default
|
||||
Constructible</a> (which many of the standard function objects are not).</TD>
|
||||
its argument.</TD>
|
||||
</TR>
|
||||
|
||||
<TR>
|
||||
@@ -181,8 +173,8 @@ function to add four to each element of the array.
|
||||
<pre>
|
||||
std::cout << "adding 4 to each element in the array:" << std::endl;
|
||||
|
||||
std::copy(boost::make_transform_iterator(x, boost::bind1st(std::plus<int>(), 4)),
|
||||
boost::make_transform_iterator(x + N, boost::bind1st(std::plus<int>(), 4)),
|
||||
std::copy(boost::make_transform_iterator(x, std::bind1st(std::plus<int>(), 4)),
|
||||
boost::make_transform_iterator(x + N, std::bind1st(std::plus<int>(), 4)),
|
||||
std::ostream_iterator<int>(std::cout, " "));
|
||||
std::cout << std::endl;
|
||||
|
||||
@@ -211,7 +203,7 @@ iterator always returns by-value.
|
||||
|
||||
|
||||
<hr>
|
||||
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->29 Mar 2001<!--webbot bot="Timestamp" endspan i-checksum="14896" --></p>
|
||||
<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->09 Mar 2001<!--webbot bot="Timestamp" endspan i-checksum="14894" --></p>
|
||||
<p><EFBFBD> Copyright Jeremy Siek 2000. 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"
|
||||
|
||||
@@ -9,38 +9,6 @@
|
||||
#include <iostream>
|
||||
#include <boost/iterator_adaptors.hpp>
|
||||
|
||||
// What a bummer. We can't use std::binder1st with transform iterator
|
||||
// because it does not have a default constructor. Here's a version
|
||||
// that does.
|
||||
|
||||
namespace boost {
|
||||
|
||||
template <class Operation>
|
||||
class binder1st
|
||||
: public std::unary_function<typename Operation::second_argument_type,
|
||||
typename Operation::result_type> {
|
||||
protected:
|
||||
Operation op;
|
||||
typename Operation::first_argument_type value;
|
||||
public:
|
||||
binder1st() { } // this had to be added!
|
||||
binder1st(const Operation& x,
|
||||
const typename Operation::first_argument_type& y)
|
||||
: op(x), value(y) {}
|
||||
typename Operation::result_type
|
||||
operator()(const typename Operation::second_argument_type& x) const {
|
||||
return op(value, x);
|
||||
}
|
||||
};
|
||||
|
||||
template <class Operation, class T>
|
||||
inline binder1st<Operation> bind1st(const Operation& op, const T& x) {
|
||||
typedef typename Operation::first_argument_type arg1_type;
|
||||
return binder1st<Operation>(op, arg1_type(x));
|
||||
}
|
||||
|
||||
} // namespace boost
|
||||
|
||||
int
|
||||
main(int, char*[])
|
||||
{
|
||||
@@ -52,11 +20,11 @@ main(int, char*[])
|
||||
int x[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
|
||||
const int N = sizeof(x)/sizeof(int);
|
||||
|
||||
typedef boost::binder1st< std::multiplies<int> > Function;
|
||||
typedef std::binder1st< std::multiplies<int> > Function;
|
||||
typedef boost::transform_iterator_generator<Function, int*>::type doubling_iterator;
|
||||
|
||||
doubling_iterator i(x, boost::bind1st(std::multiplies<int>(), 2)),
|
||||
i_end(x + N, boost::bind1st(std::multiplies<int>(), 2));
|
||||
doubling_iterator i(x, std::bind1st(std::multiplies<int>(), 2)),
|
||||
i_end(x + N, std::bind1st(std::multiplies<int>(), 2));
|
||||
|
||||
std::cout << "multiplying the array by 2:" << std::endl;
|
||||
while (i != i_end)
|
||||
@@ -65,8 +33,8 @@ main(int, char*[])
|
||||
|
||||
std::cout << "adding 4 to each element in the array:" << std::endl;
|
||||
|
||||
std::copy(boost::make_transform_iterator(x, boost::bind1st(std::plus<int>(), 4)),
|
||||
boost::make_transform_iterator(x + N, boost::bind1st(std::plus<int>(), 4)),
|
||||
std::copy(boost::make_transform_iterator(x, std::bind1st(std::plus<int>(), 4)),
|
||||
boost::make_transform_iterator(x + N, std::bind1st(std::plus<int>(), 4)),
|
||||
std::ostream_iterator<int>(std::cout, " "));
|
||||
std::cout << std::endl;
|
||||
|
||||
|
||||
@@ -93,7 +93,7 @@ destructor declarations. He says "Probably this concern is misplaced, becau
|
||||
noncopyable will be used mostly for classes which own resources and thus have non-trivial destruction semantics."</p>
|
||||
<hr>
|
||||
<p>Revised <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan
|
||||
-->08 March, 2001<!--webbot bot="Timestamp" endspan i-checksum="28780"
|
||||
-->28 February, 2001<!--webbot bot="Timestamp" endspan i-checksum="40412"
|
||||
-->
|
||||
</p>
|
||||
<p><EFBFBD> Copyright boost.org 1999. Permission to copy, use, modify, sell and
|
||||
|
||||
Reference in New Issue
Block a user