2003-08-05 19:48:41 +00:00
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
< html xmlns = "http://www.w3.org/1999/xhtml" xml:lang = "en" lang = "en" >
< head >
< meta http-equiv = "Content-Type" content = "text/html; charset=utf-8" / >
2007-07-06 19:47:17 +00:00
< meta name = "generator" content = "Docutils 0.5: http://docutils.sourceforge.net/" / >
2003-08-05 19:48:41 +00:00
< title > Function Output Iterator< / title >
< meta name = "author" content = "David Abrahams, Jeremy Siek, Thomas Witt" / >
< meta name = "organization" content = "Boost Consulting, Indiana University Open Systems Lab, University of Hanover Institute for Transport Railway Operation and Construction" / >
2007-07-06 19:47:17 +00:00
< meta name = "date" content = "2006-09-11" / >
2004-11-02 14:31:27 +00:00
< meta name = "copyright" content = "Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003." / >
2007-07-06 19:47:17 +00:00
< link rel = "stylesheet" href = "../../../rst.css" type = "text/css" / >
2003-08-05 19:48:41 +00:00
< / head >
< body >
2005-05-20 15:32:55 +00:00
< div class = "document" id = "function-output-iterator" >
2003-08-05 19:48:41 +00:00
< h1 class = "title" > Function Output Iterator< / h1 >
< table class = "docinfo" frame = "void" rules = "none" >
< col class = "docinfo-name" / >
< col class = "docinfo-content" / >
< tbody valign = "top" >
< tr > < th class = "docinfo-name" > Author:< / th >
< td > David Abrahams, Jeremy Siek, Thomas Witt< / td > < / tr >
< tr > < th class = "docinfo-name" > Contact:< / th >
2007-07-06 19:47:17 +00:00
< td > < a class = "first reference external" href = "mailto:dave@boost-consulting.com" > dave@ boost-consulting.com< / a > , < a class = "reference external" href = "mailto:jsiek@osl.iu.edu" > jsiek@ osl.iu.edu< / a > , < a class = "last reference external" href = "mailto:witt@ive.uni-hannover.de" > witt@ ive.uni-hannover.de< / a > < / td > < / tr >
2003-08-05 19:48:41 +00:00
< tr > < th class = "docinfo-name" > Organization:< / th >
2007-07-06 19:47:17 +00:00
< td > < a class = "first reference external" href = "http://www.boost-consulting.com" > Boost Consulting< / a > , Indiana University < a class = "reference external" href = "http://www.osl.iu.edu" > Open Systems
Lab< / a > , University of Hanover < a class = "last reference external" href = "http://www.ive.uni-hannover.de" > Institute for Transport
2003-08-05 19:48:41 +00:00
Railway Operation and Construction< / a > < / td > < / tr >
< tr > < th class = "docinfo-name" > Date:< / th >
2007-07-06 19:47:17 +00:00
< td > 2006-09-11< / td > < / tr >
2003-08-05 19:48:41 +00:00
< tr > < th class = "docinfo-name" > Copyright:< / th >
2004-11-02 14:31:27 +00:00
< td > Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.< / td > < / tr >
2003-08-05 19:48:41 +00:00
< / tbody >
< / table >
2006-09-11 22:27:29 +00:00
<!-- Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
2005-05-20 15:32:55 +00:00
< table class = "docutils field-list" frame = "void" rules = "none" >
2003-08-05 19:48:41 +00:00
< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
2006-09-11 22:27:29 +00:00
< tr class = "field" > < th class = "field-name" > abstract:< / th > < td class = "field-body" > <!-- Copyright David Abrahams 2006. Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
The function output iterator adaptor makes it easier to create custom
2003-08-05 19:48:41 +00:00
output iterators. The adaptor takes a unary function and creates a
model of Output Iterator. Each item assigned to the output iterator is
passed as an argument to the unary function. The motivation for this
iterator is that creating a conforming output iterator is non-trivial,
particularly because the proper implementation usually requires a
2004-01-13 02:58:21 +00:00
proxy object.< / td >
< / tr >
< / tbody >
< / table >
2007-07-06 19:47:17 +00:00
< div class = "contents topic" id = "table-of-contents" >
< p class = "topic-title first" > Table of Contents< / p >
2003-08-05 19:48:41 +00:00
< ul class = "simple" >
2007-07-06 19:47:17 +00:00
< li > < a class = "reference internal" href = "#header" id = "id1" > Header< / a > < / li >
< li > < a class = "reference internal" href = "#function-output-iterator-requirements" id = "id2" > < tt class = "docutils literal" > < span class = "pre" > function_output_iterator< / span > < / tt > requirements< / a > < / li >
< li > < a class = "reference internal" href = "#function-output-iterator-models" id = "id3" > < tt class = "docutils literal" > < span class = "pre" > function_output_iterator< / span > < / tt > models< / a > < / li >
< li > < a class = "reference internal" href = "#function-output-iterator-operations" id = "id4" > < tt class = "docutils literal" > < span class = "pre" > function_output_iterator< / span > < / tt > operations< / a > < / li >
< li > < a class = "reference internal" href = "#example" id = "id5" > Example< / a > < / li >
2003-08-05 19:48:41 +00:00
< / ul >
< / div >
2006-09-11 22:27:29 +00:00
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
2007-07-06 19:47:17 +00:00
< div class = "section" id = "header" >
< h1 > < a class = "toc-backref" href = "#id1" > Header< / a > < / h1 >
2006-02-01 23:33:32 +00:00
< pre class = "literal-block" >
#include < boost/function_output_iterator.hpp>
< / pre >
2003-08-05 19:48:41 +00:00
< pre class = "literal-block" >
template < class UnaryFunction>
class function_output_iterator {
public:
2004-01-12 19:30:48 +00:00
typedef std::output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
2003-08-05 19:48:41 +00:00
2004-01-27 04:13:36 +00:00
explicit function_output_iterator();
explicit function_output_iterator(const UnaryFunction& f);
2003-08-05 19:48:41 +00:00
2004-01-13 13:51:28 +00:00
/* see below */ operator*();
2003-08-05 19:48:41 +00:00
function_output_iterator& operator++();
function_output_iterator& operator++(int);
2004-01-12 19:30:48 +00:00
private:
UnaryFunction m_f; // exposition only
2003-08-05 19:48:41 +00:00
};
< / pre >
2006-02-01 23:33:32 +00:00
< / div >
2007-07-06 19:47:17 +00:00
< div class = "section" id = "function-output-iterator-requirements" >
< h1 > < a class = "toc-backref" href = "#id2" > < tt class = "docutils literal" > < span class = "pre" > function_output_iterator< / span > < / tt > requirements< / a > < / h1 >
2005-05-20 15:32:55 +00:00
< p > < tt class = "docutils literal" > < span class = "pre" > UnaryFunction< / span > < / tt > must be Assignable and Copy Constructible.< / p >
2004-01-12 19:30:48 +00:00
< / div >
2007-07-06 19:47:17 +00:00
< div class = "section" id = "function-output-iterator-models" >
< h1 > < a class = "toc-backref" href = "#id3" > < tt class = "docutils literal" > < span class = "pre" > function_output_iterator< / span > < / tt > models< / a > < / h1 >
2005-05-20 15:32:55 +00:00
< p > < tt class = "docutils literal" > < span class = "pre" > function_output_iterator< / span > < / tt > is a model of the Writable and
2004-01-12 19:30:48 +00:00
Incrementable Iterator concepts.< / p >
2003-08-05 19:48:41 +00:00
< / div >
2007-07-06 19:47:17 +00:00
< div class = "section" id = "function-output-iterator-operations" >
< h1 > < a class = "toc-backref" href = "#id4" > < tt class = "docutils literal" > < span class = "pre" > function_output_iterator< / span > < / tt > operations< / a > < / h1 >
2005-05-20 15:32:55 +00:00
< p > < tt class = "docutils literal" > < span class = "pre" > explicit< / span > < span class = "pre" > function_output_iterator(const< / span > < span class = "pre" > UnaryFunction& < / span > < span class = "pre" > f< / span > < span class = "pre" > =< / span > < span class = "pre" > UnaryFunction());< / span > < / tt > < / p >
< table class = "docutils field-list" frame = "void" rules = "none" >
2003-08-05 19:48:41 +00:00
< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
2006-09-11 22:27:29 +00:00
< tr class = "field" > < th class = "field-name" > Effects:< / th > < td class = "field-body" > Constructs an instance of < tt class = "docutils literal" > < span class = "pre" > function_output_iterator< / span > < / tt >
2005-05-20 15:32:55 +00:00
with < tt class = "docutils literal" > < span class = "pre" > m_f< / span > < / tt > constructed from < tt class = "docutils literal" > < span class = "pre" > f< / span > < / tt > .< / td >
2003-08-05 19:48:41 +00:00
< / tr >
< / tbody >
< / table >
2005-05-20 15:32:55 +00:00
< p > < tt class = "docutils literal" > < span class = "pre" > operator*();< / span > < / tt > < / p >
< table class = "docutils field-list" frame = "void" rules = "none" >
2003-08-05 19:48:41 +00:00
< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
2005-05-20 15:32:55 +00:00
< tr class = "field" > < th class = "field-name" > Returns:< / th > < td class = "field-body" > An object < tt class = "docutils literal" > < span class = "pre" > r< / span > < / tt > of unspecified type such that < tt class = "docutils literal" > < span class = "pre" > r< / span > < span class = "pre" > =< / span > < span class = "pre" > t< / span > < / tt >
is equivalent to < tt class = "docutils literal" > < span class = "pre" > m_f(t)< / span > < / tt > for all < tt class = "docutils literal" > < span class = "pre" > t< / span > < / tt > .< / td >
2003-08-05 19:48:41 +00:00
< / tr >
< / tbody >
< / table >
2005-05-20 15:32:55 +00:00
< p > < tt class = "docutils literal" > < span class = "pre" > function_output_iterator& < / span > < span class = "pre" > operator++();< / span > < / tt > < / p >
< table class = "docutils field-list" frame = "void" rules = "none" >
2003-08-05 19:48:41 +00:00
< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
2005-05-20 15:32:55 +00:00
< tr class = "field" > < th class = "field-name" > Returns:< / th > < td class = "field-body" > < tt class = "docutils literal" > < span class = "pre" > *this< / span > < / tt > < / td >
2003-08-05 19:48:41 +00:00
< / tr >
< / tbody >
< / table >
2005-05-20 15:32:55 +00:00
< p > < tt class = "docutils literal" > < span class = "pre" > function_output_iterator& < / span > < span class = "pre" > operator++(int);< / span > < / tt > < / p >
< table class = "docutils field-list" frame = "void" rules = "none" >
2003-08-05 19:48:41 +00:00
< col class = "field-name" / >
< col class = "field-body" / >
< tbody valign = "top" >
2005-05-20 15:32:55 +00:00
< tr class = "field" > < th class = "field-name" > Returns:< / th > < td class = "field-body" > < tt class = "docutils literal" > < span class = "pre" > *this< / span > < / tt > < / td >
2003-08-05 19:48:41 +00:00
< / tr >
< / tbody >
< / table >
2006-09-11 22:27:29 +00:00
<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
<!-- Software License, Version 1.0. (See accompanying -->
<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
2003-08-05 19:48:41 +00:00
< / div >
2007-07-06 19:47:17 +00:00
< div class = "section" id = "example" >
< h1 > < a class = "toc-backref" href = "#id5" > Example< / a > < / h1 >
2004-01-12 04:17:26 +00:00
< pre class = "literal-block" >
struct string_appender
{
string_appender(std::string& s)
: m_str(& s)
{}
void operator()(const std::string& x) const
{
*m_str += x;
}
std::string* m_str;
};
int main(int, char*[])
{
std::vector< std::string> x;
x.push_back(" hello" );
x.push_back(" " );
x.push_back(" world" );
x.push_back(" !" );
std::string s = " " ;
2006-09-11 22:27:29 +00:00
std::copy(x.begin(), x.end(),
2004-01-12 04:17:26 +00:00
boost::make_function_output_iterator(string_appender(s)));
std::cout < < s < < std::endl;
return 0;
}
< / pre >
2003-08-05 19:48:41 +00:00
< / div >
2007-07-06 19:47:17 +00:00
< / div >
< div class = "footer" >
< hr class = "footer" / >
< a class = "reference external" href = "function_output_iterator.rst" > View document source< / a > .
Generated by < a class = "reference external" href = "http://docutils.sourceforge.net/" > Docutils< / a > from < a class = "reference external" href = "http://docutils.sourceforge.net/rst.html" > reStructuredText< / a > source.
2004-01-12 02:49:55 +00:00
< / div >
2003-08-05 19:48:41 +00:00
< / body >
< / html >
