@related : [[C]] [[C++]] [[Programming]] [[MSVC]]

=== THE C PREPROCESSOR & ITS LANGUAGE===


=== PREPROC ===

  #define max2(a,b)  ( (a>b) ? a : b )
  #define max3(a,b,c)  ( max2( (max2(a,b) , c ) )

  #ifndef __cplusplus
  #error A C++ compiler is required
  #endif


  printf("DATE=%s, TIME=%s\n", _ _ DATE _ _,  _ _ TIME _ _);
  //Jun XX XXXX, 15:01:32

  printf("FILE=%s, LINE=%d\n",  _ _ FILE _ _, _ _ LINE _ _ );
  //main.cpp, line: 133

  #define Str(x) #x
  #define Xstr(x) Str(x)
  #define OP plus
  char *opname = Xstr(OP);

  #define Paste(a, b) a##b

=== [[C++]] Wrap===

  #ifdef  __cplusplus
  extern "C" {
  #endif

  /* ... C  code ... */

  #ifdef  __cplusplus
  } // extern "C"
  #endif

=== [[MSVC]]===

#ifdef _MSC_VER // msvc-6.0 does declare var outside's for scope
#define for if (true) for
#endif // _MSC_VER


===USING C PREPROC AND C++ TEMPLATES===

How to use C Preprocessor on some template parameter ?

I'm afraid C Preproc process before the C++ one ... if we can say that

I needed a such thing to provide "switch on type facilities"  :

  #include <iostream>
  #include <string>
  using namespace std;

  #define cdebug cout
  /**
    * @author: www.philippe.COVAL.online.fr
    * PROJECT=preproc; make ${PROJECT} ; ./${PROJECT} ; rm ./${PROJECT}
    **/

  #define STR(x) #x

  template<class T>
  class Cls {
  public:
  Cls(T* in=0) : ptr_(in) {    type_=STR(T);  }
  T* ptr_;
  char* type_;
  };

  int main(int argc, char* argv[[]]) {
  cdebug<<STR(stringize)<<endl; // says "stringize" // ok
  Cls<char> a;
  cdebug<<a.type_<<endl; //says "T" and "char" was wanted //PB HERE
  }

see  typeid (T).name () or gcc typeof()

  #include <iostream>
  #include <string>
  #include <typeinfo>
  using namespace std;

  #define cdebug cout
  /**
    * @author: www.philippe.COVAL.online.fr
    * PROJECT=typeid; make ${PROJECT} ; ./${PROJECT} ; rm ./${PROJECT}
    **/

  template<class T>
  class Cls
  {
  public:
   Cls(T* in=0) : ptr_(in) {
    //type_= typeid(T); // how to use this ?
    type_name_= typeid(T).name();
  }

  type_info type_id() { return typeid(T); }

  T* ptr_;

  const char* type_name_;
  //type_info type_; // how to use this ?
  };


  int main(int argc, char* argv[[]]) {
  Cls<char> a;
  cdebug<<a.type_name_<<endl; //says "c"
  Cls<Cls<char> > b;
  cdebug<<b.type_name_<<endl; //says "3ClsIcE"

  if ( typeid(a) ==== typeid(b) ) { cdebug<<"differents"<<endl; } // ok diff===
  //if ( a.type_id() ==== b.type_id() ) { cdebug<<"differents"<<endl; }===
  //  switch ( typeid(a) ) {
  //typeid.cpp:39: error: switch quantity not an integer
  }

===COMPILER SPECIFIC MACROS===

See [[ProgrammingTool]]s

  * gcc : _ _ GNUC _ _  _ _ PRETTY_FUNCTION _ _

  * [[Microsoft]] :
  _WIN32 _MSC_VER _MT _DLL _MFC_VER _CPPRTTI _CPPUNWIND _M_IX86


==== Java =====

  * http://code.google.com/p/android/issues/detail?id=2659
  * antenna : https://sourceforge.net/tracker/?func=detail&aid=2941118&group_id=67420&atid=517829
  * http://stackoverflow.com/questions/1922521/conditional-java-compilation# [[blackberry]]


==== MISC ====

  * http://gcc.gnu.org/ml/gcc-help/2000-01/msg00036.html
  * http://www.cplusplus.com/doc/tutorial/tut5-4.html
  * http://gcc.gnu.org/onlinedocs/gcc/Typeof.html
  * http://www.redhat.com/docs/manuals/enterprise/RHEL-3-Manual/cpp/predefined-macros.html
  * http://www.pccl.demon.co.uk/C/defines.list
  * http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng/htm/prepr_18.asp
  * http://sebsauvage.net/paste/?074ac75b4700c9dc#W+MG6eyZB76Dx606RGkCyVgvGc36o42EjVj/YPQ2WSM=
  * http://hackerslab.eu/blog/2012/05/custom-but-simple-memory-debugging/# MlK