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Xport Interface: `stylesheet_formatter::operator !`

Evaluates the stylesheet_formatter object.

bool stylesheet_formatter::operator !();

Parameters

None

Returns

Returns true if it's specified output file/stream is valid and open, false otherwise.

Remarks

This operation is used to verify the state of stylesheet_formatter's internal output stream. The output stream/file is specified in stylesheet_formatter's constructor. If a file or stream is specified which is not opened or in a bad state, this operation will return false. If the stream or file is open and in a good state, the operation will return true.

This operation is handy for verifying the state of the stylesheet_formatter object before using it to format and output stylesheet's or stylesheet_item's objects.

Complexity

Constant

Example

#include "xhtml_doc.h"
#include <iostream>

int main(int argc, char* argv[])
{
  using namespace Xport;

  // create an output file stream with an invalid filename
  std::ofstream badfile("c:/bad?file.htm");
  stylesheet_formatter fmtr1(badfile);

  // create an output filename with a valid filename
  std::ofstream goodfile("c:/goodfile.htm");
  stylesheet_formatter fmtr2(goodfile);

  // create an output string stream
  std::ostringstream osstr;
  stylesheet_formatter fmtr3(osstr);

  // create a formatter tied to cout
  stylesheet_formatter fmtr4(std::cout);

  std::cout << "Formatter 1 is in a " << (!fmtr1 ? "bad" : "good") << " state.\n";
  std::cout << "Formatter 2 is in a " << (!fmtr2 ? "bad" : "good") << " state.\n";
  std::cout << "Formatter 3 is in a " << (!fmtr3 ? "bad" : "good") << " state.\n";
  std::cout << "Formatter 4 is in a " << (!fmtr4 ? "bad" : "good") << " state.\n";
}

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