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< 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" / >
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< meta name = "date" content = "2006-09-11" / >
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< meta name = "copyright" content = "Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003." / >
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< div class = "document" id = "function-output-iterator" >
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< h1 class = "title" > Function Output Iterator< / h1 >
< table class = "docinfo" frame = "void" rules = "none" >
< col class = "docinfo-name" / >
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< tr > < th class = "docinfo-name" > Author:< / th >
< td > David Abrahams, Jeremy Siek, Thomas Witt< / td > < / tr >
< tr > < th class = "docinfo-name" > Contact:< / th >
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< 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 >
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< tr > < th class = "docinfo-name" > Organization:< / th >
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< 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
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Railway Operation and Construction< / a > < / td > < / tr >
< tr > < th class = "docinfo-name" > Date:< / th >
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< td > 2006-09-11< / td > < / tr >
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< tr > < th class = "docinfo-name" > Copyright:< / th >
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< td > Copyright David Abrahams, Jeremy Siek, and Thomas Witt 2003.< / td > < / tr >
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< / tbody >
< / table >
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<!-- 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) -->
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< table class = "docutils field-list" frame = "void" rules = "none" >
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< 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
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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
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proxy object.< / td >
< / tr >
< / tbody >
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< div class = "contents topic" id = "table-of-contents" >
< p class = "topic-title first" > Table of Contents< / p >
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< ul class = "simple" >
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< 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 >
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< / ul >
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<!-- 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) -->
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< div class = "section" id = "header" >
< h1 > < a class = "toc-backref" href = "#id1" > Header< / a > < / h1 >
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< pre class = "literal-block" >
#include < boost/function_output_iterator.hpp>
< / pre >
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< pre class = "literal-block" >
template < class UnaryFunction>
class function_output_iterator {
public:
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typedef std::output_iterator_tag iterator_category;
typedef void value_type;
typedef void difference_type;
typedef void pointer;
typedef void reference;
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explicit function_output_iterator();
explicit function_output_iterator(const UnaryFunction& f);
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/* see below */ operator*();
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function_output_iterator& operator++();
function_output_iterator& operator++(int);
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private:
UnaryFunction m_f; // exposition only
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};
< / pre >
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< / div >
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< 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 >
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< p > < tt class = "docutils literal" > < span class = "pre" > UnaryFunction< / span > < / tt > must be Assignable and Copy Constructible.< / p >
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< / div >
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< 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 >
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< p > < tt class = "docutils literal" > < span class = "pre" > function_output_iterator< / span > < / tt > is a model of the Writable and
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Incrementable Iterator concepts.< / p >
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< / div >
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< 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 >
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< 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" >
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< col class = "field-name" / >
< col class = "field-body" / >
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< 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 >
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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 >
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< / tr >
< / tbody >
< / table >
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< p > < tt class = "docutils literal" > < span class = "pre" > operator*();< / span > < / tt > < / p >
< table class = "docutils field-list" frame = "void" rules = "none" >
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< col class = "field-name" / >
< col class = "field-body" / >
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< 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 >
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< / tr >
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< 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" >
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< col class = "field-name" / >
< col class = "field-body" / >
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< tr class = "field" > < th class = "field-name" > Returns:< / th > < td class = "field-body" > < tt class = "docutils literal" > < span class = "pre" > *this< / span > < / tt > < / td >
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< / tr >
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< 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" >
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< col class = "field-name" / >
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< tbody valign = "top" >
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< tr class = "field" > < th class = "field-name" > Returns:< / th > < td class = "field-body" > < tt class = "docutils literal" > < span class = "pre" > *this< / span > < / tt > < / td >
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< / tr >
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<!-- 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) -->
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< / div >
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< div class = "section" id = "example" >
< h1 > < a class = "toc-backref" href = "#id5" > Example< / a > < / h1 >
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< 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 = " " ;
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std::copy(x.begin(), x.end(),
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boost::make_function_output_iterator(string_appender(s)));
std::cout < < s < < std::endl;
return 0;
}
< / pre >
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