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<concept id="GUID-A2031A61-3319-4FBA-BC71-AC1327182053" xml:lang="en"><title>Getting
started with C++ Standard Library</title><shortdesc>The Standard C++ library depends on P.I.P.S.. The user must have
the P.I.P.S. components installed before using the library.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
<section id="GUID-D42A187D-603E-4D66-BAA8-86782B9C2717"><title>C++ IOstream
and Standard Template Library Documentation</title><p>C++ IOStream library
documentation can be found at <xref href="http://www.slac.stanford.edu/comp/unix/gnu-info/iostream_toc.html" scope="external">http://www.slac.stanford.edu/comp/unix/gnu-info/iostream_toc.html</xref>.</p><p>Similarly,
Standard Template Library (STL) documentation can be found at <xref href="http://www.informatik.uni-freiburg.de/~danlee/fun/STL-doc/STL.html" scope="external">http://www.informatik.uni-freiburg.de/~danlee/fun/STL-doc/STL.html</xref>.</p></section>
<section id="GUID-BF521201-7BE5-4AC5-8D35-1E15AC4887C7-GENID-1-10-1-11-1-1-9-1-5-1-3-2"><title>Changes to
the MMP file</title><p><b>Add needed libraries used by the MMP file structure: </b></p><p>If
developers want to use any of Standard C++ library, they must link to the
corresponding library in the MMP file using the <codeph>LIBRARY</codeph> keyword.</p><p>If
the application has <codeph>main()</codeph> as the entry point, the library <filepath>libcrt0.lib</filepath> must
be specified as the first library otherwise, it results in linker errors.
The user must link to the Symbian platform <filepath>euser.dll</filepath>.
This is required since the static library uses some of the services of the
Symbian platform, such as, creating cleanup stack, and having a top level
TRAP. All these details are hidden from the developer. The developer will
write the application as if it were for the UNIX environment.</p><codeblock xml:space="preserve">STATICLIBRARY  libcrt0.lib
LIBRARY        libc.lib 
LIBRARY        euser.lib  // Needed in order to use Symbian services
</codeblock><p>The <filepath>libcrt0.lib</filepath> library is required for
writing to <codeph>E32Main</codeph> within our application (EXE). This static
library has an implementation of <codeph>E32Main</codeph> within which it
calls the library initialization method followed by calling main written by
the developer. This static library also retrieves command-line arguments and
passes the same to main.</p><p>If the application has <codeph>E32Main()</codeph> as
an entry point, there is no need to link to <filepath>libcrt0.lib</filepath> like
in the example below.</p><codeblock xml:space="preserve">LIBRARY         libc.lib 
LIBRARY         euser.lib</codeblock><p><b>Add required include paths</b></p><codeblock xml:space="preserve">SYSTEMINCLUDE   \epoc32\include\stdapis
SYSTEMINCLUDE   \epoc32\include\stdapis\sys
SYSTEMINCLUDE   \epoc32\include\stdapis\stlport 
</codeblock><p><b>Linking of <codeph>libstdcpp</codeph></b></p><p>Following
snippet shows how to perform the linking to <codeph>libstdcpp</codeph> on
an emulator: </p><codeblock xml:space="preserve">#ifdef EPOC32
LIBRARY  libstdcpp.lib
#else
FIRSTLIB ../udeb/libstdcpp.lib
STATICLIBRARY    eexe.lib 
#endif</codeblock><p>Add the below option and macro in the MMP file</p><codeblock xml:space="preserve">//This is required even if the wchar type is not used.
OPTION CW -wchar_t on 
MACRO  _WCHAR_T_DECLARED</codeblock><note> Standard C++ applications may require
more stack space. The recommended stack size is 10K. To set the stack size
to 10K add: </note><codeblock xml:space="preserve">EPOCSTACKSIZE 0x10000</codeblock><p>in the MMP
file.</p></section>
<section id="GUID-BF521201-7BE5-4AC5-8D35-1E15AC4887C7-GENID-1-10-1-11-1-1-9-1-5-1-3-3"><title>Example using <codeph>main()</codeph></title> 
     <p>A simple example using <codeph>main()</codeph> as an entry point is
described below. The example writes a text to a console.</p><ul>
<li><p>Modify the MMP file as mentioned before.</p></li>
<li><p>Do usual C++ style coding.</p></li>
</ul><codeblock xml:space="preserve">//  Include Files  
#include &lt;iostream&gt;
#include &lt;cstring&gt;
// This is a GCCE toolchain workaround needed when compiling with GCCE
// and using main() entry point
#ifdef __GCCE__

// This is a GCCE toolchain workaround needed when compiling with GCCE
// and using main() entry point
#ifdef __GCCE__

#include &lt;staticlibinit_gcce.h&gt;
#endif

using namespace std;

class myclass {
public:
  void show(){cout&lt;&lt;"Hello World\n"; }
} ;

int main()
{
  myclass obj;
  obj.show();
  cout&lt;&lt;"Press a character to exit!";
  int c = getchar();
  return 0;
}
</codeblock></section>
</conbody></concept>