File: ac_cxx_have_long_long_for_iostream.html

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
 <head>
  <title>
   Autoconf Macro: ac_cxx_have_long_long_for_iostream
  </title>
  <link rel="stylesheet" type="text/css" href="ac-archive.css">
 </head>
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      "http://autoconf-archive.cryp.to/ac_cxx_have_long_long_for_iostream.m4">Download
      M4 Source</a>
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  <hr>
  <h1>
   ac_cxx_have_long_long_for_iostream
  </h1>
  <h2>
   Synopsis
  </h2>
  <p class="indent" style="white-space:nowrap;">
   <code>AC_CXX_HAVE_LONG_LONG_FOR_IOSTREAM</code>
  </p>
  <h2>
   Description
  </h2>
  <div class="indent">
   <p>
    Check if the compiler allow long long for [i|o]stream Seems that OpenBSD /
    gcc-3 don't have it.
   </p>
   <p>
    Eg:
   </p>
   <pre>
  #include &lt;iostream&gt;
  #ifdef HAVE_SSTREAM
  #include &lt;strstream&gt;
  #else
  #include &lt;sstream&gt;
  #endif
  #ifdef HAVE_NAMESPACES
  using namespace std;
  #endif
  ostream str((streambuf *)0);
  long long lo=1;
  str &lt;&lt;
  #ifdef HAVE_LONG_LONG_FOR_IOSTREAM
    (long int)
  #endif
          lo;
</pre>
  </div>
  <h2>
   Author
  </h2>
  <p class="indent">
   Alain BARBET &lt;alian@cpan.org&gt;
  </p>
  <h2>
   Last Modified
  </h2>
  <p class="indent">
   2002-09-04
  </p>
  <h2>
   M4 Source Code
  </h2>
  <div class="indent">
   <pre class="m4source">
AC_DEFUN([AC_CXX_HAVE_LONG_LONG_FOR_IOSTREAM],
[AC_CACHE_CHECK(whether the compiler allow long long for [i|o]stream,
ac_cv_cxx_have_ll_for_iostream,
[AC_REQUIRE([AC_CXX_NAMESPACES])
  AC_REQUIRE([AC_CXX_HAVE_SSTREAM])
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_COMPILE([#include &lt;iostream&gt;
#ifdef HAVE_SSTREAM
#include &lt;strstream&gt;
#else
#include &lt;sstream&gt;
#endif
#ifdef HAVE_NAMESPACES
using namespace std;
#endif],[ ostream str((streambuf *)0); long long l=1; str &lt;&lt; l; return 0;],
  ac_cv_cxx_have_ll_for_iostream=yes, ac_cv_cxx_have_ll_for_iostream=no)
  AC_LANG_RESTORE
])
if test "$ac_cv_cxx_have_ll_for_iostream" = yes; then
   AC_DEFINE(HAVE_LONG_LONG_FOR_IOSTREAM,,[define if the compiler allow long long for [i|o]stream])
fi
])
</pre>
  </div>
 </body>
</html>