JStreamAvailable.cc

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#include <iostream>
#include <iomanip>
#include <vector>

#include "JLang/JStreamAvailable.hh"
#include "JLang/JBool.hh"

#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"


struct __A__ {

  /**
   * Read object from input.
   *
   * \param  in       input stream
   * \param  object   object
   * \return          input stream
   */
  friend inline std::istream& operator>>(std::istream& in, __A__& object)
  {
    return in;
  }
};  
  

template<class T>
struct __B__ {};

/**
 * Write object to output.
 *
 * \param  out      output stream
 * \param  object   object
 * \return          output stream
 */
template<class T>
inline std::ostream& operator<<(std::ostream& out, const __B__<T>& object)
{
  return out << "__B__";
}


struct __C__ {};
  

/**
 * Read <tt>std::vector<int></tt> from input.
 *
 * \param  in       input stream
 * \param  object   object
 * \return          input stream
 */
inline std::istream& operator>>(std::istream& in, std::vector<int>& object)
{
  for (int value; in >> value; ) {
    object.push_back(value);
  }
    
  return in;
}
  
  
/**
 * Write <tt>std::vector<int></tt> to output.
 *
 * \param  out      output stream
 * \param  object   object
 * \return          output stream
 */
inline std::ostream& operator<<(std::ostream& out, const std::vector<int>& object)
{
  for (std::vector<int>::const_iterator i = object.begin(); i != object.end(); ++i) {
    out << ' ' << *i;
  }
    
  return out;
}


namespace {

  /**
   * Print object.
   *
   * \param  out         output stream
   * \param  object      object
   * \param  option      true
   */
  template<class T>
  inline void print(std::ostream& out, const T& object, JLANG::JBool<true> option)
  {
    out << object << std::endl;
  }
  
  
  /**
   * Print object.
   *
   * \param  out         output stream
   * \param  object      object
   * \param  option      false
   */
  template<class T>
  inline void print(std::ostream& out, const T& object, JLANG::JBool<false> option)
  {
    out << "No output operation available." << std::endl;
  }

  
  /**
   * Print object.
   *
   * \param  out         output stream
   * \param  object      object
   */
  template<class T>
  inline void print(std::ostream& out, const T& object)
  {
    print(out, object, JLANG::JBool<JStreamAvailable<T>::has_ostream>());
  }
}

/**
 * Print class parameters.
 *
 * \param  OUT         output stream
 * \param  CLASS       class
 */
#define PRINT(OUT, CLASS)                                       \
  OUT << std::setw(12) << std::left << #CLASS << ' ' ;          \
  OUT << JStreamAvailable<CLASS>::has_istream << '/';           \
  OUT << JStreamAvailable<CLASS>::has_ostream << std::endl;



/**
 * \file
 *
 * Example program to test JLANG::JStreamAvailable class.
 * \author mdejong
 */
int main(int argc, char **argv)
{
  using namespace std;
  using namespace JPP;

  int            debug;

  try { 

    JParser<> zap("Example program to test availability of I/O stream redirection.");
    
    zap['d'] = make_field(debug)           = 3;

    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }


  cout.tie(&cerr);

  if (debug >= debug_t) {

    cout << setw(12) << left  << "class" << " I/O" << endl;
    cout << setw(12) << right << setfill('-') << "" << "+---" << setfill(' ') << endl;

    PRINT(cout, double);
    PRINT(cout, __A__);
    PRINT(cout, __B__<int>);
    PRINT(cout, __C__);
    PRINT(cout, vector<int>);
    
    print(cout, vector<int>(5, 1));
    print(cout, vector<double>(5, 1.0));

    __A__      a;
    __B__<int> b;
    __C__      c;

    cout << "STREAM << __A__: " << STREAM("?") << a << endl;
    cout << "STREAM << __B__: " << STREAM("?") << b << endl;
    cout << "STREAM << __C__: " << STREAM("?") << c << endl;
  }

  ASSERT( JStreamAvailable<__A__>::has_istream);
  ASSERT(!JStreamAvailable<__A__>::has_ostream);
  ASSERT(!JStreamAvailable< __B__<int> >::has_istream);
  ASSERT( JStreamAvailable< __B__<int> >::has_ostream);
  ASSERT(!JStreamAvailable<__C__>::has_istream);
  ASSERT(!JStreamAvailable<__C__>::has_ostream);
  ASSERT( JStreamAvailable< vector<int> >::has_istream);
  ASSERT( JStreamAvailable< vector<int> >::has_ostream);
  ASSERT(!JStreamAvailable< vector<double> >::has_istream);
  ASSERT(!JStreamAvailable< vector<double> >::has_ostream);

  return 0;
}