2006-08-22 15:57:13 +00:00
< html >
< head >
< meta http-equiv = "Content-Type" content = "text/html; charset=ISO-8859-1" >
< title > I/O< / title >
< link rel = "stylesheet" href = "../../../boostbook.css" type = "text/css" >
< meta name = "generator" content = "DocBook XSL Stylesheets V1.66.1" >
< link rel = "start" href = "../../../index.html" title = "Chapter<65> 1.<2E> Fusion 2.0" >
< link rel = "up" href = "../operators.html" title = "Operators" >
< link rel = "prev" href = "../operators.html" title = "Operators" >
< link rel = "next" href = "i_o/in.html" title = "in" >
< / head >
< body bgcolor = "white" text = "black" link = "#0000FF" vlink = "#840084" alink = "#0000FF" >
< table cellpadding = "2" width = "100%" >
< td valign = "top" > < img alt = "Boost C++ Libraries" width = "277" height = "86" src = "../../../../../../../boost.png" > < / td >
< td align = "center" > < a href = "../../../../../../../index.htm" > Home< / a > < / td >
< td align = "center" > < a href = "../../../../../../libraries.htm" > Libraries< / a > < / td >
< td align = "center" > < a href = "../../../../../../../people/people.htm" > People< / a > < / td >
< td align = "center" > < a href = "../../../../../../../more/faq.htm" > FAQ< / a > < / td >
< td align = "center" > < a href = "../../../../../../../more/index.htm" > More< / a > < / td >
< / table >
< hr >
< div class = "spirit-nav" >
< a accesskey = "p" href = "../operators.html" > < img src = "../../../images/prev.png" alt = "Prev" > < / a > < a accesskey = "u" href = "../operators.html" > < img src = "../../../images/up.png" alt = "Up" > < / a > < a accesskey = "h" href = "../../../index.html" > < img src = "../../../images/home.png" alt = "Home" > < / a > < a accesskey = "n" href = "i_o/in.html" > < img src = "../../../images/next.png" alt = "Next" > < / a >
< / div >
< div class = "section" lang = "en" >
< div class = "titlepage" > < div > < div > < h4 class = "title" >
< a name = "fusion.sequences.operators.i_o" > < / a > < a href = "i_o.html" title = "I/O" > I/O< / a > < / h4 > < / div > < / div > < / div >
< div class = "toc" > < dl >
< dt > < span class = "section" > < a href = "i_o/in.html" > in< / a > < / span > < / dt >
< dt > < span class = "section" > < a href = "i_o/out.html" > out< / a > < / span > < / dt >
< / dl > < / div >
< p >
The I/O operators: < tt class = "computeroutput" > < span class = "special" > < < < / span > < / tt >
and < tt class = "computeroutput" > < span class = "special" > > > < / span > < / tt > work generically
on all Fusion sequences. The global < tt class = "computeroutput" > < span class = "keyword" > operator< / span > < span class = "special" > < < < / span > < / tt > has been overloaded for generic
output streams such that < span class = "underline" > _sequence< / span > _s
are output by recursively calling < tt class = "computeroutput" > < span class = "keyword" > operator< / span > < span class = "special" > < < < / span > < / tt > for each element. Analogously,
the global < tt class = "computeroutput" > < span class = "keyword" > operator< / span > < span class = "special" > > > < / span > < / tt >
has been overloaded to extract < span class = "underline" > _sequence< / span > _s
from generic input streams by recursively calling < tt class = "computeroutput" > < span class = "keyword" > operator< / span > < span class = "special" > > > < / span > < / tt > for each element.
< / p >
< p >
The default delimiter between the elements is space, and the < a href = "../../sequences.html" title = "Sequences" > Sequence< / a >
is enclosed in parenthesis. For Example:
< / p >
< pre class = "programlisting" >
< a href = "../containers/vector.html" title = "vector" > < tt class = "computeroutput" > < span class = "identifier" > vector< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "keyword" > float< / span > < span class = "special" > ,< / span > < span class = "keyword" > int< / span > < span class = "special" > ,< / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > string< / span > < span class = "special" > > < / span > < span class = "identifier" > a< / span > < span class = "special" > (< / span > < span class = "number" > 1.0f< / span > < span class = "special" > ,< / span > < span class = "number" > 2< / span > < span class = "special" > ,< / span > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > string< / span > < span class = "special" > (< / span > < span class = "string" > "Howdy folks!"< / span > < span class = "special" > );< / span >
< span class = "identifier" > cout< / span > < span class = "special" > < < < / span > < span class = "identifier" > a< / span > < span class = "special" > ;< / span >
< / pre >
< p >
outputs the < a href = "../containers/vector.html" title = "vector" > < tt class = "computeroutput" > < span class = "identifier" > vector< / span > < / tt > < / a > as: (1.0 2 Howdy folks!)
< / p >
< p >
The library defines three manipulators for changing the default behavior:
< / p >
< div class = "variablelist" >
< p class = "title" > < b > Manipulators< / b > < / p >
< dl >
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > tuple_open< / span > < span class = "special" > (< / span > < span class = "identifier" > arg< / span > < span class = "special" > )< / span > < / tt > < / span > < / dt >
< dd >
Defines the character that is output before the first element.
< / dd >
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > tuple_close< / span > < span class = "special" > (< / span > < span class = "identifier" > arg< / span > < span class = "special" > )< / span > < / tt > < / span > < / dt >
< dd >
Defines the character that is output after the last element.
< / dd >
< dt > < span class = "term" > < tt class = "computeroutput" > < span class = "identifier" > tuple_delimiter< / span > < span class = "special" > (< / span > < span class = "identifier" > arg< / span > < span class = "special" > )< / span > < / tt > < / span > < / dt >
< dd >
Defines the delimiter character between elements.
< / dd >
< / dl >
< / div >
< p >
The argument to < tt class = "computeroutput" > < span class = "identifier" > tuple_open< / span > < / tt > ,
< tt class = "computeroutput" > < span class = "identifier" > tuple_close< / span > < / tt > and < tt class = "computeroutput" > < span class = "identifier" > tuple_delimiter< / span > < / tt > may be a < tt class = "computeroutput" > < span class = "keyword" > char< / span > < / tt > , < tt class = "computeroutput" > < span class = "keyword" > wchar_t< / span > < / tt > ,
a C-string, or a wide C-string.
< / p >
< p >
Example:
< / p >
< pre class = "programlisting" >
< span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > cout< / span > < span class = "special" > < < < / span > < span class = "identifier" > tuple_open< / span > < span class = "special" > (< / span > < span class = "char" > '['< / span > < span class = "special" > )< / span > < span class = "special" > < < < / span > < span class = "identifier" > tuple_close< / span > < span class = "special" > (< / span > < span class = "char" > ']'< / span > < span class = "special" > )< / span > < span class = "special" > < < < / span > < span class = "identifier" > tuple_delimiter< / span > < span class = "special" > (< / span > < span class = "string" > ", "< / span > < span class = "special" > )< / span > < span class = "special" > < < < / span > < span class = "identifier" > a< / span > < span class = "special" > ;< / span >
< / pre >
< p >
outputs the same < a href = "../containers/vector.html" title = "vector" > < tt class = "computeroutput" > < span class = "identifier" > vector< / span > < / tt > < / a > , < tt class = "computeroutput" > < span class = "identifier" > a< / span > < / tt >
as: [1.0, 2, Howdy folks!]
< / p >
< p >
The same manipulators work with < tt class = "computeroutput" > < span class = "keyword" > operator< / span > < span class = "special" > > > < / span > < / tt > and < tt class = "computeroutput" > < span class = "identifier" > istream< / span > < / tt >
as well. Suppose the < tt class = "computeroutput" > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > cin< / span > < / tt >
stream contains the following data:
< / p >
< pre class = "programlisting" >
< span class = "special" > (< / span > < span class = "number" > 1< / span > < span class = "number" > 2< / span > < span class = "number" > 3< / span > < span class = "special" > )< / span > < span class = "special" > [< / span > < span class = "number" > 4< / span > < span class = "special" > :< / span > < span class = "number" > 5< / span > < span class = "special" > ]< / span >
< / pre >
< p >
The code:
< / p >
< pre class = "programlisting" >
< a href = "../containers/vector.html" title = "vector" > < tt class = "computeroutput" > < span class = "identifier" > vector< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "keyword" > int< / span > < span class = "special" > ,< / span > < span class = "keyword" > int< / span > < span class = "special" > ,< / span > < span class = "keyword" > int< / span > < span class = "special" > > < / span > < span class = "identifier" > i< / span > < span class = "special" > ;< / span >
< a href = "../containers/vector.html" title = "vector" > < tt class = "computeroutput" > < span class = "identifier" > vector< / span > < / tt > < / a > < span class = "special" > < < / span > < span class = "keyword" > int< / span > < span class = "special" > ,< / span > < span class = "keyword" > int< / span > < span class = "special" > > < / span > < span class = "identifier" > j< / span > < span class = "special" > ;< / span >
< span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > cin< / span > < span class = "special" > > > < / span > < span class = "identifier" > i< / span > < span class = "special" > ;< / span >
< span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > cin< / span > < span class = "special" > > > < / span > < span class = "identifier" > set_open< / span > < span class = "special" > (< / span > < span class = "char" > '['< / span > < span class = "special" > )< / span > < span class = "special" > > > < / span > < span class = "identifier" > set_close< / span > < span class = "special" > (< / span > < span class = "char" > ']'< / span > < span class = "special" > )< / span > < span class = "special" > > > < / span > < span class = "identifier" > set_delimiter< / span > < span class = "special" > (< / span > < span class = "char" > ':'< / span > < span class = "special" > );< / span >
< span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > cin< / span > < span class = "special" > > > < / span > < span class = "identifier" > j< / span > < span class = "special" > ;< / span >
< / pre >
< p >
reads the data into the < span class = "underline" > _vector< / span > _s
< tt class = "computeroutput" > < span class = "identifier" > i< / span > < / tt > and < tt class = "computeroutput" > < span class = "identifier" > j< / span > < / tt > .
< / p >
< p >
Note that extracting < span class = "underline" > _sequence< / span > _s
with < tt class = "computeroutput" > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > string< / span > < / tt > or C-style string elements does
not generally work, since the streamed < a href = "../../sequences.html" title = "Sequences" > Sequence< / a >
representation may not be unambiguously parseable.
< / p >
< a name = "fusion.sequences.operators.i_o.header" > < / a > < h5 >
2006-10-30 01:20:23 +00:00
< a name = "id542372" > < / a >
2006-08-22 15:57:13 +00:00
< a href = "i_o.html#fusion.sequences.operators.i_o.header" > Header< / a >
< / h5 >
< pre class = "programlisting" >
< span class = "preprocessor" > #include< / span > < span class = "special" > < < / span > < span class = "identifier" > boost< / span > < span class = "special" > /< / span > < span class = "identifier" > fusion< / span > < span class = "special" > /< / span > < span class = "identifier" > sequence< / span > < span class = "special" > /< / span > < span class = "identifier" > io< / span > < span class = "special" > .< / span > < span class = "identifier" > hpp< / span > < span class = "special" > > < / span >
< / pre >
< / div >
< table xmlns:rev = "http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width = "100%" > < tr >
< td align = "left" > < / td >
< td align = "right" > < small > Copyright <20> 2001-2005 Joel de Guzman, Dan Marsden< / small > < / td >
< / tr > < / table >
< hr >
< div class = "spirit-nav" >
< a accesskey = "p" href = "../operators.html" > < img src = "../../../images/prev.png" alt = "Prev" > < / a > < a accesskey = "u" href = "../operators.html" > < img src = "../../../images/up.png" alt = "Up" > < / a > < a accesskey = "h" href = "../../../index.html" > < img src = "../../../images/home.png" alt = "Home" > < / a > < a accesskey = "n" href = "i_o/in.html" > < img src = "../../../images/next.png" alt = "Next" > < / a >
< / div >
< / body >
< / html >
